build.rs

#![deny(warnings)]

extern crate cc;
extern crate ctest;

use std::env;

fn do_cc() {
    let target = env::var("TARGET").unwrap();
    if cfg!(unix) && !target.contains("wasi") {
        cc::Build::new().file("src/cmsg.c").compile("cmsg");
    }
}

fn do_ctest() {
    match &env::var("TARGET").unwrap() {
        t if t.contains("android") => return test_android(t),
        t if t.contains("apple") => return test_apple(t),
        t if t.contains("cloudabi") => return test_cloudabi(t),
        t if t.contains("dragonfly") => return test_dragonflybsd(t),
        t if t.contains("emscripten") => return test_emscripten(t),
        t if t.contains("freebsd") => return test_freebsd(t),
        t if t.contains("linux") => return test_linux(t),
        t if t.contains("netbsd") => return test_netbsd(t),
        t if t.contains("openbsd") => return test_openbsd(t),
        t if t.contains("redox") => return test_redox(t),
        t if t.contains("solaris") => return test_solaris(t),
        t if t.contains("wasi") => return test_wasi(t),
        t if t.contains("windows") => return test_windows(t),
        t => panic!("unknown target {}", t),
    }
}

fn main() {
    do_cc();
    do_ctest();
}

macro_rules! headers {
    ($cfg:ident: [$m:expr]: $header:literal) => {
        if $m {
            $cfg.header($header);
        }
    };
    ($cfg:ident: $header:literal) => {
        $cfg.header($header);
    };
    ($($cfg:ident: $([$c:expr]:)* $header:literal,)*) => {
        $(headers!($cfg: $([$c]:)* $header);)*
    };
    ($cfg:ident: $( $([$c:expr]:)* $header:literal,)*) => {
        headers!($($cfg: $([$c]:)* $header,)*);
    };
    ($cfg:ident: $( $([$c:expr]:)* $header:literal),*) => {
        headers!($($cfg: $([$c]:)* $header,)*);
    };
}

fn test_apple(target: &str) {
    assert!(target.contains("apple"));
    let x86_64 = target.contains("x86_64");

    let mut cfg = ctest::TestGenerator::new();
    cfg.flag("-Wno-deprecated-declarations");
    cfg.define("__APPLE_USE_RFC_3542", None);

    headers! { cfg:
        "aio.h",
        "ctype.h",
        "dirent.h",
        "dlfcn.h",
        "errno.h",
        "execinfo.h",
        "fcntl.h",
        "glob.h",
        "grp.h",
        "ifaddrs.h",
        "langinfo.h",
        "limits.h",
        "locale.h",
        "mach-o/dyld.h",
        "mach/mach_time.h",
        "malloc/malloc.h",
        "net/bpf.h",
        "net/if.h",
        "net/if_arp.h",
        "net/if_dl.h",
        "net/if_utun.h",
        "net/route.h",
        "net/route.h",
        "netdb.h",
        "netinet/if_ether.h",
        "netinet/in.h",
        "netinet/in.h",
        "netinet/ip.h",
        "netinet/tcp.h",
        "netinet/udp.h",
        "poll.h",
        "pthread.h",
        "pwd.h",
        "resolv.h",
        "sched.h",
        "semaphore.h",
        "signal.h",
        "spawn.h",
        "stddef.h",
        "stdint.h",
        "stdio.h",
        "stdlib.h",
        "string.h",
        "sys/event.h",
        "sys/file.h",
        "sys/ioctl.h",
        "sys/ipc.h",
        "sys/kern_control.h",
        "sys/mman.h",
        "sys/mount.h",
        "sys/proc_info.h",
        "sys/ptrace.h",
        "sys/quota.h",
        "sys/resource.h",
        "sys/sem.h",
        "sys/shm.h",
        "sys/socket.h",
        "sys/stat.h",
        "sys/statvfs.h",
        "sys/sys_domain.h",
        "sys/sysctl.h",
        "sys/time.h",
        "sys/times.h",
        "sys/types.h",
        "sys/uio.h",
        "sys/un.h",
        "sys/utsname.h",
        "sys/wait.h",
        "sys/xattr.h",
        "syslog.h",
        "termios.h",
        "time.h",
        "unistd.h",
        "util.h",
        "utime.h",
        "utmpx.h",
        "wchar.h",
        "xlocale.h",
        [x86_64]: "crt_externs.h",
    }

    cfg.skip_struct(move |ty| {
        match ty {
            // FIXME: actually a union
            "sigval" => true,

            _ => false,
        }
    });

    cfg.skip_const(move |name| {
        match name {
            // These OSX constants are removed in Sierra.
            // https://developer.apple.com/library/content/releasenotes/General/APIDiffsMacOS10_12/Swift/Darwin.html
            "KERN_KDENABLE_BG_TRACE" | "KERN_KDDISABLE_BG_TRACE" => true,
            _ => false,
        }
    });

    cfg.skip_fn(move |name| {
        // skip those that are manually verified
        match name {
            // FIXME: https://github.com/rust-lang/libc/issues/1272
            "execv" | "execve" | "execvp" => true,

            // close calls the close_nocancel system call
            "close" => true,

            _ => false,
        }
    });

    cfg.skip_field_type(move |struct_, field| {
        match (struct_, field) {
            // FIXME: actually a union
            ("sigevent", "sigev_value") => true,
            _ => false,
        }
    });

    cfg.volatile_item(|i| {
        use ctest::VolatileItemKind::*;
        match i {
            StructField(ref n, ref f) if n == "aiocb" && f == "aio_buf" => {
                true
            }
            _ => false,
        }
    });

    cfg.type_name(move |ty, is_struct, is_union| {
        match ty {
            // Just pass all these through, no need for a "struct" prefix
            "FILE" | "DIR" | "Dl_info" => ty.to_string(),

            // OSX calls this something else
            "sighandler_t" => "sig_t".to_string(),

            t if is_union => format!("union {}", t),
            t if t.ends_with("_t") => t.to_string(),
            t if is_struct => format!("struct {}", t),
            t => t.to_string(),
        }
    });

    cfg.field_name(move |struct_, field| {
        match field {
            s if s.ends_with("_nsec") && struct_.starts_with("stat") => {
                s.replace("e_nsec", "espec.tv_nsec")
            }
            // FIXME: sigaction actually contains a union with two variants:
            // a sa_sigaction with type: (*)(int, struct __siginfo *, void *)
            // a sa_handler with type sig_t
            "sa_sigaction" if struct_ == "sigaction" => {
                "sa_handler".to_string()
            }
            s => s.to_string(),
        }
    });

    cfg.skip_roundtrip(move |s| match s {
        // FIXME: TODO
        "utsname" | "statfs" | "dirent" | "utmpx" => true,
        _ => false,
    });

    cfg.generate("../src/lib.rs", "main.rs");
}

fn test_openbsd(target: &str) {
    assert!(target.contains("openbsd"));

    let mut cfg = ctest::TestGenerator::new();
    cfg.flag("-Wno-deprecated-declarations");

    headers! { cfg:
        "errno.h",
        "fcntl.h",
        "limits.h",
        "locale.h",
        "stddef.h",
        "stdint.h",
        "stdio.h",
        "stdlib.h",
        "sys/stat.h",
        "sys/types.h",
        "time.h",
        "wchar.h",
        "ctype.h",
        "dirent.h",
        "sys/socket.h",
        "net/if.h",
        "net/route.h",
        "net/if_arp.h",
        "netdb.h",
        "netinet/in.h",
        "netinet/ip.h",
        "netinet/tcp.h",
        "netinet/udp.h",
        "resolv.h",
        "pthread.h",
        "dlfcn.h",
        "signal.h",
        "string.h",
        "sys/file.h",
        "sys/ioctl.h",
        "sys/mman.h",
        "sys/resource.h",
        "sys/socket.h",
        "sys/time.h",
        "sys/un.h",
        "sys/wait.h",
        "unistd.h",
        "utime.h",
        "pwd.h",
        "grp.h",
        "sys/utsname.h",
        "sys/ptrace.h",
        "sys/mount.h",
        "sys/uio.h",
        "sched.h",
        "termios.h",
        "poll.h",
        "syslog.h",
        "semaphore.h",
        "sys/statvfs.h",
        "sys/times.h",
        "glob.h",
        "ifaddrs.h",
        "langinfo.h",
        "sys/sysctl.h",
        "utmp.h",
        "sys/event.h",
        "net/if_dl.h",
        "util.h",
        "ufs/ufs/quota.h",
        "pthread_np.h",
        "sys/syscall.h",
    }

    cfg.skip_struct(move |ty| {
        match ty {
            // FIXME: actually a union
            "sigval" => true,

            _ => false,
        }
    });

    cfg.skip_const(move |name| {
        match name {
            // Removed in OpenBSD 6.0
            "KERN_USERMOUNT" | "KERN_ARND" => true,
            _ => false,
        }
    });

    cfg.skip_fn(move |name| {
        match name {
            // FIXME: https://github.com/rust-lang/libc/issues/1272
            "execv" | "execve" | "execvp" | "execvpe" => true,

            // Removed in OpenBSD 6.5
            // https://marc.info/?l=openbsd-cvs&m=154723400730318
            "mincore" => true,

            _ => false,
        }
    });

    cfg.type_name(move |ty, is_struct, is_union| {
        match ty {
            // Just pass all these through, no need for a "struct" prefix
            "FILE" | "DIR" | "Dl_info" => ty.to_string(),

            // OSX calls this something else
            "sighandler_t" => "sig_t".to_string(),

            t if is_union => format!("union {}", t),
            t if t.ends_with("_t") => t.to_string(),
            t if is_struct => format!("struct {}", t),
            t => t.to_string(),
        }
    });

    cfg.field_name(move |struct_, field| match field {
        "st_birthtime" if struct_.starts_with("stat") => {
            "__st_birthtime".to_string()
        }
        "st_birthtime_nsec" if struct_.starts_with("stat") => {
            "__st_birthtimensec".to_string()
        }
        s if s.ends_with("_nsec") && struct_.starts_with("stat") => {
            s.replace("e_nsec", ".tv_nsec")
        }
        "sa_sigaction" if struct_ == "sigaction" => "sa_handler".to_string(),
        s => s.to_string(),
    });

    cfg.skip_field_type(move |struct_, field| {
        // type siginfo_t.si_addr changed from OpenBSD 6.0 to 6.1
        (struct_ == "siginfo_t" && field == "si_addr")
    });

    cfg.generate("../src/lib.rs", "main.rs");
}

fn test_windows(target: &str) {
    assert!(target.contains("windows"));
    let gnu = target.contains("gnu");

    let mut cfg = ctest::TestGenerator::new();
    cfg.define("_WIN32_WINNT", Some("0x8000"));

    headers! { cfg:
        "direct.h",
        "errno.h",
        "fcntl.h",
        "io.h",
        "limits.h",
        "locale.h",
        "process.h",
        "signal.h",
        "stddef.h",
        "stdint.h",
        "stdio.h",
        "stdlib.h",
        "sys/stat.h",
        "sys/types.h",
        "sys/utime.h",
        "time.h",
        "wchar.h",
        [gnu]: "ws2tcpip.h",
        [!gnu]: "Winsock2.h",
    }

    cfg.type_name(move |ty, is_struct, is_union| {
        match ty {
            // Just pass all these through, no need for a "struct" prefix
            "FILE" | "DIR" | "Dl_info" => ty.to_string(),

            // FIXME: these don't exist:
            "time64_t" => "__time64_t".to_string(),
            "ssize_t" => "SSIZE_T".to_string(),

            "sighandler_t" if !gnu => "_crt_signal_t".to_string(),
            "sighandler_t" if gnu => "__p_sig_fn_t".to_string(),

            t if is_union => format!("union {}", t),
            t if t.ends_with("_t") => t.to_string(),

            // Windows uppercase structs don't have `struct` in front:
            t if is_struct => {
                if ty.clone().chars().next().unwrap().is_uppercase() {
                    t.to_string()
                } else if t == "stat" {
                    "struct __stat64".to_string()
                } else if t == "utimbuf" {
                    "struct __utimbuf64".to_string()
                } else {
                    // put `struct` in front of all structs:
                    format!("struct {}", t)
                }
            }
            t => t.to_string(),
        }
    });

    cfg.fn_cname(move |name, cname| cname.unwrap_or(name).to_string());

    cfg.skip_type(move |name| match name {
        "SSIZE_T" if !gnu => true,
        "ssize_t" if !gnu => true,
        _ => false,
    });

    cfg.skip_const(move |name| {
        match name {
            // FIXME: API error:
            // SIG_ERR type is "void (*)(int)", not "int"
            "SIG_ERR" => true,
            _ => false,
        }
    });

    // FIXME: All functions point to the wrong addresses?
    cfg.skip_fn_ptrcheck(|_| true);

    cfg.skip_signededness(move |c| {
        match c {
            // windows-isms
            n if n.starts_with("P") => true,
            n if n.starts_with("H") => true,
            n if n.starts_with("LP") => true,
            "sighandler_t" if gnu => true,
            _ => false,
        }
    });

    cfg.skip_fn(move |name| {
        match name {
            // FIXME: https://github.com/rust-lang/libc/issues/1272
            "execv" | "execve" | "execvp" | "execvpe" => true,

            _ => false,
        }
    });

    cfg.skip_roundtrip(move |s| match s {
        "dirent" | "statfs" | "utsname" | "utmpx" => true,
        _ => false,
    });

    cfg.generate("../src/lib.rs", "main.rs");
}

fn test_redox(target: &str) {
    assert!(target.contains("redox"));

    let mut cfg = ctest::TestGenerator::new();
    cfg.flag("-Wno-deprecated-declarations");

    headers! {
        cfg:
        "ctype.h",
        "dirent.h",
        "dlfcn.h",
        "errno.h",
        "execinfo.h",
        "fcntl.h",
        "glob.h",
        "grp.h",
        "ifaddrs.h",
        "langinfo.h",
        "limits.h",
        "locale.h",
        "net/if.h",
        "net/if_arp.h",
        "net/route.h",
        "netdb.h",
        "netinet/in.h",
        "netinet/ip.h",
        "netinet/tcp.h",
        "netinet/udp.h",
        "poll.h",
        "pthread.h",
        "pwd.h",
        "resolv.h",
        "sched.h",
        "semaphore.h",
        "string.h",
        "strings.h",
        "sys/file.h",
        "sys/ioctl.h",
        "sys/mman.h",
        "sys/mount.h",
        "sys/ptrace.h",
        "sys/quota.h",
        "sys/resource.h",
        "sys/socket.h",
        "sys/stat.h",
        "sys/statvfs.h",
        "sys/sysctl.h",
        "sys/time.h",
        "sys/times.h",
        "sys/types.h",
        "sys/uio.h",
        "sys/un.h",
        "sys/utsname.h",
        "sys/wait.h",
        "syslog.h",
        "termios.h",
        "time.h",
        "unistd.h",
        "utime.h",
        "utmpx.h",
        "wchar.h",
    }

    cfg.generate("../src/lib.rs", "main.rs");
}

fn test_cloudabi(target: &str) {
    assert!(target.contains("cloudabi"));

    let mut cfg = ctest::TestGenerator::new();
    cfg.flag("-Wno-deprecated-declarations");

    headers! {
        cfg:
        "execinfo.h",
        "glob.h",
        "ifaddrs.h",
        "langinfo.h",
        "sys/ptrace.h",
        "sys/quota.h",
        "sys/sysctl.h",
        "utmpx.h",
        "ctype.h",
        "dirent.h",
        "dlfcn.h",
        "errno.h",
        "fcntl.h",
        "grp.h",
        "limits.h",
        "locale.h",
        "net/if.h",
        "net/if_arp.h",
        "net/route.h",
        "netdb.h",
        "netinet/in.h",
        "netinet/ip.h",
        "netinet/tcp.h",
        "netinet/udp.h",
        "poll.h",
        "pthread.h",
        "pwd.h",
        "resolv.h",
        "sched.h",
        "semaphore.h",
        "signal.h",
        "stddef.h",
        "stdint.h",
        "stdio.h",
        "stdlib.h",
        "string.h",
        "strings.h",
        "sys/file.h",
        "sys/ioctl.h",
        "sys/mman.h",
        "sys/mount.h",
        "sys/resource.h",
        "sys/socket.h",
        "sys/stat.h",
        "sys/statvfs.h",
        "sys/time.h",
        "sys/times.h",
        "sys/types.h",
        "sys/uio.h",
        "sys/un.h",
        "sys/utsname.h",
        "sys/wait.h",
        "syslog.h",
        "termios.h",
        "time.h",
        "unistd.h",
        "utime.h",
        "wchar.h",
    }

    cfg.generate("../src/lib.rs", "main.rs");
}

fn test_solaris(target: &str) {
    assert!(target.contains("solaris"));

    let mut cfg = ctest::TestGenerator::new();
    cfg.flag("-Wno-deprecated-declarations");

    cfg.define("_XOPEN_SOURCE", Some("700"));
    cfg.define("__EXTENSIONS__", None);
    cfg.define("_LCONV_C99", None);

    headers! {
        cfg:
        "ctype.h",
        "dirent.h",
        "dlfcn.h",
        "errno.h",
        "execinfo.h",
        "fcntl.h",
        "glob.h",
        "grp.h",
        "ifaddrs.h",
        "langinfo.h",
        "limits.h",
        "locale.h",
        "net/if.h",
        "net/if_arp.h",
        "net/route.h",
        "netdb.h",
        "netinet/in.h",
        "netinet/ip.h",
        "netinet/tcp.h",
        "netinet/udp.h",
        "poll.h",
        "port.h",
        "pthread.h",
        "pwd.h",
        "resolv.h",
        "sched.h",
        "semaphore.h",
        "signal.h",
        "stddef.h",
        "stdint.h",
        "stdio.h",
        "stdlib.h",
        "string.h",
        "sys/epoll.h",
        "sys/file.h",
        "sys/filio.h",
        "sys/ioctl.h",
        "sys/loadavg.h",
        "sys/mman.h",
        "sys/mount.h",
        "sys/resource.h",
        "sys/socket.h",
        "sys/stat.h",
        "sys/statvfs.h",
        "sys/time.h",
        "sys/times.h",
        "sys/types.h",
        "sys/uio.h",
        "sys/un.h",
        "sys/utsname.h",
        "sys/wait.h",
        "syslog.h",
        "termios.h",
        "time.h",
        "ucontext.h",
        "unistd.h",
        "utime.h",
        "utmpx.h",
        "wchar.h",
    }

    cfg.skip_const(move |name| match name {
        "DT_FIFO" | "DT_CHR" | "DT_DIR" | "DT_BLK" | "DT_REG" | "DT_LNK"
        | "DT_SOCK" | "USRQUOTA" | "GRPQUOTA" | "PRIO_MIN" | "PRIO_MAX" => {
            true
        }

        _ => false,
    });

    cfg.skip_fn(move |name| {
        // skip those that are manually verified
        match name {
            // const-ness only added recently
            "dladdr" => true,

            // Definition of those functions as changed since unified headers
            // from NDK r14b These changes imply some API breaking changes but
            // are still ABI compatible. We can wait for the next major release
            // to be compliant with the new API.
            //
            // FIXME: unskip these for next major release
            "setpriority" | "personality" => true,

            // signal is defined with sighandler_t, so ignore
            "signal" => true,

            "cfmakeraw" | "cfsetspeed" => true,

            // FIXME: mincore is defined with caddr_t on Solaris.
            "mincore" => true,

            _ => false,
        }
    });

    cfg.generate("../src/lib.rs", "main.rs");
}

fn test_netbsd(target: &str) {
    assert!(target.contains("netbsd"));
    let rumprun = target.contains("rumprun");
    let mut cfg = ctest::TestGenerator::new();

    cfg.flag("-Wno-deprecated-declarations");
    cfg.define("_NETBSD_SOURCE", Some("1"));

    headers! {
        cfg:
        "errno.h",
        "fcntl.h",
        "limits.h",
        "locale.h",
        "stddef.h",
        "stdint.h",
        "stdio.h",
        "stdlib.h",
        "sys/stat.h",
        "sys/types.h",
        "time.h",
        "wchar.h",
        "aio.h",
        "ctype.h",
        "dirent.h",
        "dlfcn.h",
        "glob.h",
        "grp.h",
        "ifaddrs.h",
        "langinfo.h",
        "net/if.h",
        "net/if_arp.h",
        "net/if_dl.h",
        "net/route.h",
        "netdb.h",
        "netinet/in.h",
        "netinet/ip.h",
        "netinet/tcp.h",
        "netinet/udp.h",
        "poll.h",
        "pthread.h",
        "pwd.h",
        "resolv.h",
        "sched.h",
        "semaphore.h",
        "signal.h",
        "string.h",
        "sys/extattr.h",
        "sys/file.h",
        "sys/ioctl.h",
        "sys/ioctl_compat.h",
        "sys/mman.h",
        "sys/mount.h",
        "sys/ptrace.h",
        "sys/resource.h",
        "sys/socket.h",
        "sys/statvfs.h",
        "sys/sysctl.h",
        "sys/time.h",
        "sys/times.h",
        "sys/uio.h",
        "sys/un.h",
        "sys/utsname.h",
        "sys/wait.h",
        "syslog.h",
        "termios.h",
        "ufs/ufs/quota.h",
        "ufs/ufs/quota1.h",
        "unistd.h",
        "util.h",
        "utime.h",
        "mqueue.h",
        "netinet/dccp.h",
        "sys/event.h",
        "sys/quota.h",
    }

    cfg.type_name(move |ty, is_struct, is_union| {
        match ty {
            // Just pass all these through, no need for a "struct" prefix
            "FILE" | "fd_set" | "Dl_info" | "DIR" | "Elf32_Phdr"
            | "Elf64_Phdr" | "Elf32_Shdr" | "Elf64_Shdr" | "Elf32_Sym"
            | "Elf64_Sym" | "Elf32_Ehdr" | "Elf64_Ehdr" | "Elf32_Chdr"
            | "Elf64_Chdr" => ty.to_string(),

            // OSX calls this something else
            "sighandler_t" => "sig_t".to_string(),

            t if is_union => format!("union {}", t),

            t if t.ends_with("_t") => t.to_string(),

            // put `struct` in front of all structs:.
            t if is_struct => format!("struct {}", t),

            t => t.to_string(),
        }
    });

    cfg.field_name(move |struct_, field| {
        match field {
            // Our stat *_nsec fields normally don't actually exist but are part
            // of a timeval struct
            s if s.ends_with("_nsec") && struct_.starts_with("stat") => {
                s.replace("e_nsec", ".tv_nsec")
            }
            "u64" if struct_ == "epoll_event" => "data.u64".to_string(),
            s => s.to_string(),
        }
    });

    cfg.skip_type(move |ty| {
        match ty {
            // FIXME: sighandler_t is crazy across platforms
            "sighandler_t" => true,
            _ => false,
        }
    });

    cfg.skip_struct(move |ty| {
        match ty {
            // This is actually a union, not a struct
            "sigval" => true,
            // These are tested as part of the linux_fcntl tests since there are
            // header conflicts when including them with all the other structs.
            "termios2" => true,
            _ => false,
        }
    });

    cfg.skip_signededness(move |c| {
        match c {
            "LARGE_INTEGER" | "float" | "double" => true,
            n if n.starts_with("pthread") => true,
            // sem_t is a struct or pointer
            "sem_t" => true,
            _ => false,
        }
    });

    cfg.skip_const(move |name| {
        match name {
            "SIG_DFL" | "SIG_ERR" | "SIG_IGN" => true, // sighandler_t weirdness
            "SIGUNUSED" => true,                       // removed in glibc 2.26

            // weird signed extension or something like that?
            "MS_NOUSER" => true,
            "MS_RMT_MASK" => true, // updated in glibc 2.22 and musl 1.1.13
            "BOTHER" => true,

            _ => false,
        }
    });

    cfg.skip_fn(move |name| {
        match name {
            // FIXME: https://github.com/rust-lang/libc/issues/1272
            "execv" | "execve" | "execvp" => true,

            "getrlimit" | "getrlimit64" |    // non-int in 1st arg
            "setrlimit" | "setrlimit64" |    // non-int in 1st arg
            "prlimit" | "prlimit64" |        // non-int in 2nd arg

            // These functions presumably exist on netbsd but don't look like
            // they're implemented on rumprun yet, just let them slide for now.
            // Some of them look like they have headers but then don't have
            // corresponding actual definitions either...
            "shm_open" |
            "shm_unlink" |
            "syscall" |
            "mq_open" |
            "mq_close" |
            "mq_getattr" |
            "mq_notify" |
            "mq_receive" |
            "mq_send" |
            "mq_setattr" |
            "mq_timedreceive" |
            "mq_timedsend" |
            "mq_unlink" |
            "ptrace" |
            "sigaltstack" if rumprun => true,

            _ => false,
        }
    });

    cfg.skip_field_type(move |struct_, field| {
        // This is a weird union, don't check the type.
        (struct_ == "ifaddrs" && field == "ifa_ifu") ||
        // sighandler_t type is super weird
        (struct_ == "sigaction" && field == "sa_sigaction") ||
        // sigval is actually a union, but we pretend it's a struct
        (struct_ == "sigevent" && field == "sigev_value") ||
        // aio_buf is "volatile void*" and Rust doesn't understand volatile
        (struct_ == "aiocb" && field == "aio_buf")
    });

    cfg.generate("../src/lib.rs", "main.rs");
}

fn test_dragonflybsd(target: &str) {
    assert!(target.contains("dragonfly"));
    let mut cfg = ctest::TestGenerator::new();
    cfg.flag("-Wno-deprecated-declarations");

    headers! {
        cfg:
        "aio.h",
        "ctype.h",
        "dirent.h",
        "dlfcn.h",
        "errno.h",
        "execinfo.h",
        "fcntl.h",
        "glob.h",
        "grp.h",
        "ifaddrs.h",
        "langinfo.h",
        "limits.h",
        "locale.h",
        "mqueue.h",
        "net/if.h",
        "net/if_arp.h",
        "net/if_dl.h",
        "net/route.h",
        "netdb.h",
        "netinet/in.h",
        "netinet/ip.h",
        "netinet/tcp.h",
        "netinet/udp.h",
        "poll.h",
        "pthread.h",
        "pthread_np.h",
        "pwd.h",
        "resolv.h",
        "sched.h",
        "semaphore.h",
        "signal.h",
        "stddef.h",
        "stdint.h",
        "stdio.h",
        "stdlib.h",
        "string.h",
        "sys/event.h",
        "sys/file.h",
        "sys/ioctl.h",
        "sys/mman.h",
        "sys/mount.h",
        "sys/ptrace.h",
        "sys/resource.h",
        "sys/rtprio.h",
        "sys/socket.h",
        "sys/stat.h",
        "sys/statvfs.h",
        "sys/sysctl.h",
        "sys/time.h",
        "sys/times.h",
        "sys/types.h",
        "sys/uio.h",
        "sys/un.h",
        "sys/utsname.h",
        "sys/wait.h",
        "syslog.h",
        "termios.h",
        "time.h",
        "ufs/ufs/quota.h",
        "unistd.h",
        "util.h",
        "utime.h",
        "utmpx.h",
        "wchar.h",
    }

    cfg.type_name(move |ty, is_struct, is_union| {
        match ty {
            // Just pass all these through, no need for a "struct" prefix
            "FILE" | "fd_set" | "Dl_info" | "DIR" | "Elf32_Phdr"
            | "Elf64_Phdr" | "Elf32_Shdr" | "Elf64_Shdr" | "Elf32_Sym"
            | "Elf64_Sym" | "Elf32_Ehdr" | "Elf64_Ehdr" | "Elf32_Chdr"
            | "Elf64_Chdr" => ty.to_string(),

            // FIXME: OSX calls this something else
            "sighandler_t" => "sig_t".to_string(),

            t if is_union => format!("union {}", t),

            t if t.ends_with("_t") => t.to_string(),

            // put `struct` in front of all structs:.
            t if is_struct => format!("struct {}", t),

            t => t.to_string(),
        }
    });

    cfg.field_name(move |struct_, field| {
        match field {
            // Our stat *_nsec fields normally don't actually exist but are part
            // of a timeval struct
            s if s.ends_with("_nsec") && struct_.starts_with("stat") => {
                s.replace("e_nsec", ".tv_nsec")
            }
            "u64" if struct_ == "epoll_event" => "data.u64".to_string(),
            // Field is named `type` in C but that is a Rust keyword,
            // so these fields are translated to `type_` in the bindings.
            "type_" if struct_ == "rtprio" => "type".to_string(),
            s => s.to_string(),
        }
    });

    cfg.skip_type(move |ty| {
        match ty {
            // sighandler_t is crazy across platforms
            "sighandler_t" => true,

            _ => false,
        }
    });

    cfg.skip_struct(move |ty| {
        match ty {
            // This is actually a union, not a struct
            "sigval" => true,

            // FIXME: These are tested as part of the linux_fcntl tests since
            // there are header conflicts when including them with all the other
            // structs.
            "termios2" => true,

            _ => false,
        }
    });

    cfg.skip_signededness(move |c| {
        match c {
            "LARGE_INTEGER" | "float" | "double" => true,
            // uuid_t is a struct, not an integer.
            "uuid_t" => true,
            n if n.starts_with("pthread") => true,
            // sem_t is a struct or pointer
            "sem_t" => true,
            // mqd_t is a pointer on DragonFly
            "mqd_t" => true,

            _ => false,
        }
    });

    cfg.skip_const(move |name| {
        match name {
            "SIG_DFL" | "SIG_ERR" | "SIG_IGN" => true, // sighandler_t weirdness

            // weird signed extension or something like that?
            "MS_NOUSER" => true,
            "MS_RMT_MASK" => true, // updated in glibc 2.22 and musl 1.1.13

            // These are defined for Solaris 11, but the crate is tested on
            // illumos, where they are currently not defined
            "EADI"
            | "PORT_SOURCE_POSTWAIT"
            | "PORT_SOURCE_SIGNAL"
            | "PTHREAD_STACK_MIN" => true,

            _ => false,
        }
    });

    cfg.skip_fn(move |name| {
        // skip those that are manually verified
        match name {
            // FIXME: https://github.com/rust-lang/libc/issues/1272
            "execv" | "execve" | "execvp" => true,

            "getrlimit" | "getrlimit64" |    // non-int in 1st arg
            "setrlimit" | "setrlimit64" |    // non-int in 1st arg
            "prlimit" | "prlimit64"        // non-int in 2nd arg
             => true,

            _ => false,
        }
    });

    cfg.skip_field_type(move |struct_, field| {
        // This is a weird union, don't check the type.
        (struct_ == "ifaddrs" && field == "ifa_ifu") ||
        // sighandler_t type is super weird
        (struct_ == "sigaction" && field == "sa_sigaction") ||
        // sigval is actually a union, but we pretend it's a struct
        (struct_ == "sigevent" && field == "sigev_value") ||
        // aio_buf is "volatile void*" and Rust doesn't understand volatile
        (struct_ == "aiocb" && field == "aio_buf")
    });

    cfg.skip_field(move |struct_, field| {
        // this is actually a union on linux, so we can't represent it well and
        // just insert some padding.
        (struct_ == "siginfo_t" && field == "_pad") ||
        // sigev_notify_thread_id is actually part of a sigev_un union
        (struct_ == "sigevent" && field == "sigev_notify_thread_id")
    });

    cfg.generate("../src/lib.rs", "main.rs");
}

fn test_wasi(target: &str) {
    assert!(target.contains("wasi"));

    let mut cfg = ctest::TestGenerator::new();
    cfg.define("_GNU_SOURCE", None);

    headers! { cfg:
        "ctype.h",
        "dirent.h",
        "errno.h",
        "fcntl.h",
        "limits.h",
        "locale.h",
        "malloc.h",
        "poll.h",
        "sched.h",
        "stdbool.h",
        "stddef.h",
        "stdint.h",
        "stdio.h",
        "stdlib.h",
        "string.h",
        "sys/resource.h",
        "sys/select.h",
        "sys/socket.h",
        "sys/stat.h",
        "sys/times.h",
        "sys/types.h",
        "sys/uio.h",
        "sys/utsname.h",
        "time.h",
        "unistd.h",
        "wasi/core.h",
        "wasi/libc.h",
        "wasi/libc-find-relpath.h",
        "wchar.h",
    }

    cfg.type_name(move |ty, is_struct, is_union| match ty {
        "FILE" | "fd_set" | "DIR" => ty.to_string(),
        t if is_union => format!("union {}", t),
        t if t.starts_with("__wasi") && t.ends_with("_u") => {
            format!("union {}", t)
        }
        t if t.starts_with("__wasi") && is_struct => format!("struct {}", t),
        t if t.ends_with("_t") => t.to_string(),
        t if is_struct => format!("struct {}", t),
        t => t.to_string(),
    });

    cfg.field_name(move |_struct, field| {
        match field {
            // deal with fields as rust keywords
            "type_" => "type".to_string(),
            s => s.to_string(),
        }
    });

    // Looks like LLD doesn't merge duplicate imports, so if the Rust
    // code imports from a module and the C code also imports from a
    // module we end up with two imports of function pointers which
    // import the same thing but have different function pointers
    cfg.skip_fn_ptrcheck(|f| f.starts_with("__wasi"));

    // d_name is declared as a flexible array in WASI libc, so it
    // doesn't support sizeof.
    cfg.skip_field(|s, field| s == "dirent" && field == "d_name");

    cfg.generate("../src/lib.rs", "main.rs");
}

fn test_android(target: &str) {
    assert!(target.contains("android"));
    let target_pointer_width = match target {
        t if t.contains("aarch64") || t.contains("x86_64") => 64,
        t if t.contains("i686") || t.contains("arm") => 32,
        t => panic!("unsupported target: {}", t),
    };
    let x86 = target.contains("i686") || target.contains("x86_64");

    let mut cfg = ctest::TestGenerator::new();
    cfg.define("_GNU_SOURCE", None);

    headers! { cfg:
               "arpa/inet.h",
               "asm/mman.h",
               "ctype.h",
               "dirent.h",
               "dlfcn.h",
               "errno.h",
               "fcntl.h",
               "grp.h",
               "ifaddrs.h",
               "limits.h",
               "linux/dccp.h",
               "linux/futex.h",
               "linux/fs.h",
               "linux/genetlink.h",
               "linux/if_alg.h",
               "linux/if_ether.h",
               "linux/if_tun.h",
               "linux/magic.h",
               "linux/memfd.h",
               "linux/module.h",
               "linux/net_tstamp.h",
               "linux/netfilter/nf_tables.h",
               "linux/netfilter_ipv4.h",
               "linux/netfilter_ipv6.h",
               "linux/netlink.h",
               "linux/quota.h",
               "linux/reboot.h",
               "linux/seccomp.h",
               "linux/sockios.h",
               "locale.h",
               "malloc.h",
               "net/ethernet.h",
               "net/if.h",
               "net/if_arp.h",
               "net/route.h",
               "netdb.h",
               "netinet/in.h",
               "netinet/ip.h",
               "netinet/tcp.h",
               "netinet/udp.h",
               "netpacket/packet.h",
               "poll.h",
               "pthread.h",
               "pty.h",
               "pwd.h",
               "resolv.h",
               "sched.h",
               "semaphore.h",
               "signal.h",
               "stddef.h",
               "stdint.h",
               "stdio.h",
               "stdlib.h",
               "string.h",
               "sys/epoll.h",
               "sys/eventfd.h",
               "sys/file.h",
               "sys/fsuid.h",
               "sys/inotify.h",
               "sys/ioctl.h",
               "sys/mman.h",
               "sys/mount.h",
               "sys/personality.h",
               "sys/prctl.h",
               "sys/ptrace.h",
               "sys/random.h",
               "sys/reboot.h",
               "sys/resource.h",
               "sys/sendfile.h",
               "sys/signalfd.h",
               "sys/socket.h",
               "sys/stat.h",
               "sys/statvfs.h",
               "sys/swap.h",
               "sys/syscall.h",
               "sys/sysinfo.h",
               "sys/time.h",
               "sys/times.h",
               "sys/types.h",
               "sys/uio.h",
               "sys/un.h",
               "sys/utsname.h",
               "sys/vfs.h",
               "sys/xattr.h",
               "sys/wait.h",
               "syslog.h",
               "termios.h",
               "time.h",
               "unistd.h",
               "utime.h",
               "utmp.h",
               "wchar.h",
               "xlocale.h",
               // time64_t is not defined for 64-bit targets If included it will
               // generate the error 'Your time_t is already 64-bit'
               [target_pointer_width == 32]: "time64.h",
               [x86]: "sys/reg.h",
    }

    cfg.type_name(move |ty, is_struct, is_union| {
        match ty {
            // Just pass all these through, no need for a "struct" prefix
            "FILE" | "fd_set" | "Dl_info" => ty.to_string(),

            t if is_union => format!("union {}", t),

            t if t.ends_with("_t") => t.to_string(),

            // sigval is a struct in Rust, but a union in C:
            "sigval" => format!("union sigval"),

            // put `struct` in front of all structs:.
            t if is_struct => format!("struct {}", t),

            t => t.to_string(),
        }
    });

    cfg.field_name(move |struct_, field| {
        match field {
            // Our stat *_nsec fields normally don't actually exist but are part
            // of a timeval struct
            s if s.ends_with("_nsec") && struct_.starts_with("stat") => {
                s.to_string()
            }
            // FIXME: appears that `epoll_event.data` is an union
            "u64" if struct_ == "epoll_event" => "data.u64".to_string(),
            s => s.to_string(),
        }
    });

    cfg.skip_type(move |ty| {
        match ty {
            // FIXME: `sighandler_t` type is incorrect, see:
            // https://github.com/rust-lang/libc/issues/1359
            "sighandler_t" => true,
            _ => false,
        }
    });

    cfg.skip_struct(move |ty| {
        match ty {
            // These are tested as part of the linux_fcntl tests since there are
            // header conflicts when including them with all the other structs.
            "termios2" => true,

            _ => false,
        }
    });

    cfg.skip_const(move |name| {
        match name {
            // FIXME: deprecated: not available in any header
            // See: https://github.com/rust-lang/libc/issues/1356
            "ENOATTR" => true,

            // FIXME: still necessary?
            "SIG_DFL" | "SIG_ERR" | "SIG_IGN" => true, // sighandler_t weirdness
            // FIXME: deprecated - removed in glibc 2.26
            "SIGUNUSED" => true,

            _ => false,
        }
    });

    cfg.skip_fn(move |name| {
        // skip those that are manually verified
        match name {
            // FIXME: https://github.com/rust-lang/libc/issues/1272
            "execv" | "execve" | "execvp" | "execvpe" | "fexecve" => true,

            // There are two versions of the sterror_r function, see
            //
            // https://linux.die.net/man/3/strerror_r
            //
            // An XSI-compliant version provided if:
            //
            // (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && ! _GNU_SOURCE
            //
            // and a GNU specific version provided if _GNU_SOURCE is defined.
            //
            // libc provides bindings for the XSI-compliant version, which is
            // preferred for portable applications.
            //
            // We skip the test here since here _GNU_SOURCE is defined, and
            // test the XSI version below.
            "strerror_r" => true,

            _ => false,
        }
    });

    cfg.skip_field_type(move |struct_, field| {
        // This is a weird union, don't check the type.
        (struct_ == "ifaddrs" && field == "ifa_ifu") ||
        // sigval is actually a union, but we pretend it's a struct
        (struct_ == "sigevent" && field == "sigev_value")
    });

    cfg.skip_field(move |struct_, field| {
        // this is actually a union on linux, so we can't represent it well and
        // just insert some padding.
        (struct_ == "siginfo_t" && field == "_pad") ||
        // FIXME: `sa_sigaction` has type `sighandler_t` but that type is
        // incorrect, see: https://github.com/rust-lang/libc/issues/1359
        (struct_ == "sigaction" && field == "sa_sigaction") ||
        // sigev_notify_thread_id is actually part of a sigev_un union
        (struct_ == "sigevent" && field == "sigev_notify_thread_id") ||
        // signalfd had SIGSYS fields added in Android 4.19, but CI does not have that version yet.
        (struct_ == "signalfd_siginfo" && (field == "ssi_syscall" ||
                                           field == "ssi_call_addr" ||
                                           field == "ssi_arch"))
    });

    let bit64 = target.contains("64");
    cfg.skip_roundtrip(move |s| match s {
        "utsname" | "dirent" | "dirent64" => true,
        "utmp" if bit64 => true,
        _ => false,
    });

    cfg.generate("../src/lib.rs", "main.rs");

    test_linux_like_apis(target);
}

fn test_freebsd(target: &str) {
    assert!(target.contains("freebsd"));
    let mut cfg = ctest::TestGenerator::new();

    let freebsd_ver = which_freebsd();

    match freebsd_ver {
        Some(11) => cfg.cfg("freebsd11", None),
        Some(12) => cfg.cfg("freebsd12", None),
        Some(13) => cfg.cfg("freebsd13", None),
        _ => &mut cfg
    };

    // Required for `getline`:
    cfg.define("_WITH_GETLINE", None);
    // Required for making freebsd11_stat available in the headers
    cfg.define("_WANT_FREEBSD11_STAT", None);

    headers! { cfg:
                "aio.h",
                "arpa/inet.h",
                "ctype.h",
                "dirent.h",
                "dlfcn.h",
                "errno.h",
                "fcntl.h",
                "glob.h",
                "grp.h",
                "ifaddrs.h",
                "langinfo.h",
                "libutil.h",
                "limits.h",
                "locale.h",
                "mqueue.h",
                "net/bpf.h",
                "net/if.h",
                "net/if_arp.h",
                "net/if_dl.h",
                "net/route.h",
                "netdb.h",
                "netinet/ip.h",
                "netinet/in.h",
                "netinet/tcp.h",
                "netinet/udp.h",
                "poll.h",
                "pthread.h",
                "pthread_np.h",
                "pwd.h",
                "resolv.h",
                "sched.h",
                "semaphore.h",
                "signal.h",
                "spawn.h",
                "stddef.h",
                "stdint.h",
                "stdio.h",
                "stdlib.h",
                "string.h",
                "sys/event.h",
                "sys/extattr.h",
                "sys/file.h",
                "sys/ioctl.h",
                "sys/ipc.h",
                "sys/jail.h",
                "sys/mman.h",
                "sys/mount.h",
                "sys/msg.h",
                "sys/procdesc.h",
                "sys/ptrace.h",
                "sys/resource.h",
                "sys/rtprio.h",
                "sys/shm.h",
                "sys/socket.h",
                "sys/stat.h",
                "sys/statvfs.h",
                "sys/sysctl.h",
                "sys/time.h",
                "sys/times.h",
                "sys/types.h",
                "sys/uio.h",
                "sys/un.h",
                "sys/utsname.h",
                "sys/wait.h",
                "syslog.h",
                "termios.h",
                "time.h",
                "ufs/ufs/quota.h",
                "unistd.h",
                "utime.h",
                "utmpx.h",
                "wchar.h",
    }

    cfg.type_name(move |ty, is_struct, is_union| {
        match ty {
            // Just pass all these through, no need for a "struct" prefix
            "FILE" | "fd_set" | "Dl_info" | "DIR" => ty.to_string(),

            // FIXME: https://github.com/rust-lang/libc/issues/1273
            "sighandler_t" => "sig_t".to_string(),

            t if is_union => format!("union {}", t),

            t if t.ends_with("_t") => t.to_string(),

            // sigval is a struct in Rust, but a union in C:
            "sigval" => format!("union sigval"),

            // put `struct` in front of all structs:.
            t if is_struct => format!("struct {}", t),

            t => t.to_string(),
        }
    });

    cfg.field_name(move |struct_, field| {
        match field {
            // Our stat *_nsec fields normally don't actually exist but are part
            // of a timeval struct
            s if s.ends_with("_nsec") && struct_.starts_with("stat") => {
                s.replace("e_nsec", ".tv_nsec")
            }
            // Field is named `type` in C but that is a Rust keyword,
            // so these fields are translated to `type_` in the bindings.
            "type_" if struct_ == "rtprio" => "type".to_string(),
            s => s.to_string(),
        }
    });

    cfg.skip_const(move |name| {
        match name {
            // These constants were introduced in FreeBSD 12:
            "SF_USER_READAHEAD"
            | "EVFILT_EMPTY"
            | "SO_REUSEPORT_LB"
            | "IP_ORIGDSTADDR"
            | "IP_RECVORIGDSTADDR"
            | "IPV6_ORIGDSTADDR"
            | "IPV6_RECVORIGDSTADDR"
                if Some(11) == freebsd_ver =>
            {
                true
            }

            // FIXME: There are deprecated - remove in a couple of releases.
            // These constants were removed in FreeBSD 11 (svn r273250) but will
            // still be accepted and ignored at runtime.
            "MAP_RENAME" | "MAP_NORESERVE" if Some(10) != freebsd_ver => true,

            // FIXME: There are deprecated - remove in a couple of releases.
            // These constants were removed in FreeBSD 11 (svn r262489),
            // and they've never had any legitimate use outside of the
            // base system anyway.
            "CTL_MAXID" | "KERN_MAXID" | "HW_MAXID" | "USER_MAXID" => true,

            _ => false,
        }
    });

    cfg.skip_fn(move |name| {
        // skip those that are manually verified
        match name {
            // FIXME: https://github.com/rust-lang/libc/issues/1272
            "execv" | "execve" | "execvp" | "execvpe" | "fexecve" => true,

            // The `uname` function in the `utsname.h` FreeBSD header is a C
            // inline function (has no symbol) that calls the `__xuname` symbol.
            // Therefore the function pointer comparison does not make sense for it.
            "uname" => true,

            // FIXME: Our API is unsound. The Rust API allows aliasing
            // pointers, but the C API requires pointers not to alias.
            // We should probably be at least using `&`/`&mut` here, see:
            // https://github.com/gnzlbg/ctest/issues/68
            "lio_listio" => true,

            _ => false,
        }
    });

    cfg.volatile_item(|i| {
        use ctest::VolatileItemKind::*;
        match i {
            // aio_buf is a volatile void** but since we cannot express that in
            // Rust types, we have to explicitly tell the checker about it here:
            StructField(ref n, ref f) if n == "aiocb" && f == "aio_buf" => {
                true
            }
            _ => false,
        }
    });

    cfg.skip_field(move |struct_, field| {
        // FIXME: `sa_sigaction` has type `sighandler_t` but that type is
        // incorrect, see: https://github.com/rust-lang/libc/issues/1359
        (struct_ == "sigaction" && field == "sa_sigaction")
    });

    cfg.skip_roundtrip(move |s| match s {
        "dirent" | "statfs" | "utsname" | "utmpx" => true,
        _ => false,
    });

    cfg.generate("../src/lib.rs", "main.rs");
}

fn test_emscripten(target: &str) {
    assert!(target.contains("emscripten"));

    let mut cfg = ctest::TestGenerator::new();
    cfg.define("_GNU_SOURCE", None); // FIXME: ??

    headers! { cfg:
               "aio.h",
               "ctype.h",
               "dirent.h",
               "dlfcn.h",
               "errno.h",
               "fcntl.h",
               "glob.h",
               "grp.h",
               "ifaddrs.h",
               "langinfo.h",
               "limits.h",
               "locale.h",
               "malloc.h",
               "mntent.h",
               "mqueue.h",
               "net/ethernet.h",
               "net/if.h",
               "net/if_arp.h",
               "net/route.h",
               "netdb.h",
               "netinet/in.h",
               "netinet/ip.h",
               "netinet/tcp.h",
               "netinet/udp.h",
               "netpacket/packet.h",
               "poll.h",
               "pthread.h",
               "pty.h",
               "pwd.h",
               "resolv.h",
               "sched.h",
               "sched.h",
               "semaphore.h",
               "shadow.h",
               "signal.h",
               "stddef.h",
               "stdint.h",
               "stdio.h",
               "stdlib.h",
               "string.h",
               "sys/epoll.h",
               "sys/eventfd.h",
               "sys/file.h",
               "sys/ioctl.h",
               "sys/ipc.h",
               "sys/mman.h",
               "sys/mount.h",
               "sys/msg.h",
               "sys/personality.h",
               "sys/prctl.h",
               "sys/ptrace.h",
               "sys/quota.h",
               "sys/reboot.h",
               "sys/resource.h",
               "sys/sem.h",
               "sys/sendfile.h",
               "sys/shm.h",
               "sys/signalfd.h",
               "sys/socket.h",
               "sys/stat.h",
               "sys/statvfs.h",
               "sys/swap.h",
               "sys/syscall.h",
               "sys/sysctl.h",
               "sys/sysinfo.h",
               "sys/time.h",
               "sys/timerfd.h",
               "sys/times.h",
               "sys/types.h",
               "sys/uio.h",
               "sys/un.h",
               "sys/user.h",
               "sys/utsname.h",
               "sys/vfs.h",
               "sys/wait.h",
               "sys/xattr.h",
               "syslog.h",
               "termios.h",
               "time.h",
               "ucontext.h",
               "unistd.h",
               "utime.h",
               "utmp.h",
               "utmpx.h",
               "wchar.h",
    }

    cfg.type_name(move |ty, is_struct, is_union| {
        match ty {
            // Just pass all these through, no need for a "struct" prefix
            "FILE" | "fd_set" | "Dl_info" | "DIR" => ty.to_string(),

            t if is_union => format!("union {}", t),

            t if t.ends_with("_t") => t.to_string(),

            // put `struct` in front of all structs:.
            t if is_struct => format!("struct {}", t),

            t => t.to_string(),
        }
    });

    cfg.field_name(move |struct_, field| {
        match field {
            // Our stat *_nsec fields normally don't actually exist but are part
            // of a timeval struct
            s if s.ends_with("_nsec") && struct_.starts_with("stat") => {
                s.replace("e_nsec", ".tv_nsec")
            }
            // FIXME: appears that `epoll_event.data` is an union
            "u64" if struct_ == "epoll_event" => "data.u64".to_string(),
            s => s.to_string(),
        }
    });

    cfg.skip_type(move |ty| {
        match ty {
            // sighandler_t is crazy across platforms
            // FIXME: is this necessary?
            "sighandler_t" => true,

            _ => false,
        }
    });

    cfg.skip_struct(move |ty| {
        match ty {
            // This is actually a union, not a struct
            // FIXME: is this necessary?
            "sigval" => true,

            _ => false,
        }
    });

    cfg.skip_fn(move |name| {
        match name {
            // FIXME: https://github.com/rust-lang/libc/issues/1272
            "execv" | "execve" | "execvp" | "execvpe" | "fexecve" => true,

            _ => false,
        }
    });

    cfg.skip_const(move |name| {
        match name {
            // FIXME: deprecated - SIGNUNUSED was removed in glibc 2.26
            // users should use SIGSYS instead
            "SIGUNUSED" => true,

            // FIXME: emscripten uses different constants to constructs these
            n if n.contains("__SIZEOF_PTHREAD") => true,

            _ => false,
        }
    });

    cfg.skip_field_type(move |struct_, field| {
        // This is a weird union, don't check the type.
        // FIXME: is this necessary?
        (struct_ == "ifaddrs" && field == "ifa_ifu") ||
        // sighandler_t type is super weird
        // FIXME: is this necessary?
        (struct_ == "sigaction" && field == "sa_sigaction") ||
        // sigval is actually a union, but we pretend it's a struct
        // FIXME: is this necessary?
        (struct_ == "sigevent" && field == "sigev_value") ||
        // aio_buf is "volatile void*" and Rust doesn't understand volatile
        // FIXME: is this necessary?
        (struct_ == "aiocb" && field == "aio_buf")
    });

    cfg.skip_field(move |struct_, field| {
        // this is actually a union on linux, so we can't represent it well and
        // just insert some padding.
        // FIXME: is this necessary?
        (struct_ == "siginfo_t" && field == "_pad") ||
        // musl names this __dummy1 but it's still there
        // FIXME: is this necessary?
        (struct_ == "glob_t" && field == "gl_flags") ||
        // musl seems to define this as an *anonymous* bitfield
        // FIXME: is this necessary?
        (struct_ == "statvfs" && field == "__f_unused") ||
        // sigev_notify_thread_id is actually part of a sigev_un union
        (struct_ == "sigevent" && field == "sigev_notify_thread_id") ||
        // signalfd had SIGSYS fields added in Linux 4.18, but no libc release has them yet.
        (struct_ == "signalfd_siginfo" && (field == "ssi_addr_lsb" ||
                                           field == "_pad2" ||
                                           field == "ssi_syscall" ||
                                           field == "ssi_call_addr" ||
                                           field == "ssi_arch"))
    });

    cfg.skip_roundtrip(move |s| match s {
        "pthread_mutexattr_t"
        | "utsname"
        | "dirent"
        | "dirent64"
        | "sysinfo" => true,
        _ => false,
    });

    // FIXME: test linux like
    cfg.generate("../src/lib.rs", "main.rs");
}

fn test_linux(target: &str) {
    assert!(target.contains("linux"));

    // target_env
    let gnu = target.contains("gnu");
    let musl = target.contains("musl");
    let uclibc = target.contains("uclibc");

    match (gnu, musl, uclibc) {
        (true, false, false) => (),
        (false, true, false) => (),
        (false, false, true) => (),
        (_, _, _) => panic!(
            "linux target lib is gnu: {}, musl: {}, uclibc: {}",
            gnu, musl, uclibc
        ),
    }

    let arm = target.contains("arm");
    let x86_64 = target.contains("x86_64");
    let x86_32 = target.contains("i686");
    let x32 = target.contains("x32");
    let mips = target.contains("mips");
    let mips32 = mips && !target.contains("64");
    let mips64 = mips && target.contains("64");
    let mips32_musl = mips32 && musl;
    let sparc64 = target.contains("sparc64");
    let s390x = target.contains("s390x");

    let mut cfg = ctest::TestGenerator::new();
    cfg.define("_GNU_SOURCE", None);
    // This macro re-deifnes fscanf,scanf,sscanf to link to the symbols that are
    // deprecated since glibc >= 2.29. This allows Rust binaries to link against
    // glibc versions older than 2.29.
    cfg.define("__GLIBC_USE_DEPRECATED_SCANF", None);

    headers! { cfg:
               "ctype.h",
               "dirent.h",
               "dlfcn.h",
               "elf.h",
               "fcntl.h",
               "glob.h",
               "grp.h",
               "ifaddrs.h",
               "langinfo.h",
               "limits.h",
               "link.h",
               "locale.h",
               "malloc.h",
               "mntent.h",
               "mqueue.h",
               "net/ethernet.h",
               "net/if.h",
               "net/if_arp.h",
               "net/route.h",
               "netdb.h",
               "netinet/in.h",
               "netinet/ip.h",
               "netinet/tcp.h",
               "netinet/udp.h",
               "netpacket/packet.h",
               "poll.h",
               "pthread.h",
               "pty.h",
               "pwd.h",
               "resolv.h",
               "sched.h",
               "semaphore.h",
               "shadow.h",
               "signal.h",
               "spawn.h",
               "stddef.h",
               "stdint.h",
               "stdio.h",
               "stdlib.h",
               "string.h",
               "sys/epoll.h",
               "sys/eventfd.h",
               "sys/file.h",
               "sys/fsuid.h",
               "sys/inotify.h",
               "sys/ioctl.h",
               "sys/ipc.h",
               "sys/mman.h",
               "sys/mount.h",
               "sys/msg.h",
               "sys/personality.h",
               "sys/prctl.h",
               "sys/ptrace.h",
               "sys/quota.h",
               // FIXME: the mips-musl CI build jobs use ancient musl 1.0.15:
               [!mips32_musl]: "sys/random.h",
               "sys/reboot.h",
               "sys/resource.h",
               "sys/sem.h",
               "sys/sendfile.h",
               "sys/shm.h",
               "sys/signalfd.h",
               "sys/socket.h",
               "sys/stat.h",
               "sys/statvfs.h",
               "sys/swap.h",
               "sys/syscall.h",
               "sys/time.h",
               "sys/timerfd.h",
               "sys/times.h",
               "sys/types.h",
               "sys/uio.h",
               "sys/un.h",
               "sys/user.h",
               "sys/utsname.h",
               "sys/vfs.h",
               "sys/wait.h",
               "syslog.h",
               "termios.h",
               "time.h",
               "ucontext.h",
               "unistd.h",
               "utime.h",
               "utmp.h",
               "utmpx.h",
               "wchar.h",
               "errno.h",
               // `sys/io.h` is only available on x86*, Alpha, IA64, and 32-bit
               // ARM: https://bugzilla.redhat.com/show_bug.cgi?id=1116162
               [x86_64 || x86_32 || arm]: "sys/io.h",
               // `sys/reg.h` is only available on x86 and x86_64
               [x86_64 || x86_32]: "sys/reg.h",
               // sysctl system call is deprecated and not available on musl
               // It is also unsupported in x32:
               [!(x32 || musl)]: "sys/sysctl.h",
               // <execinfo.h> is not supported by musl:
               // https://www.openwall.com/lists/musl/2015/04/09/3
               [!musl]: "execinfo.h",
    }

    // Include linux headers at the end:
    headers! {
        cfg:
        "asm/mman.h",
        "linux/dccp.h",
        "linux/falloc.h",
        "linux/fs.h",
        "linux/futex.h",
        "linux/genetlink.h",
        // FIXME: musl version 1.0.15 used by mips build jobs is ancient
        [!mips32_musl]: "linux/if.h",
        "linux/if_addr.h",
        "linux/if_alg.h",
        "linux/if_ether.h",
        "linux/if_tun.h",
        "linux/input.h",
        "linux/magic.h",
        "linux/memfd.h",
        "linux/module.h",
        "linux/net_tstamp.h",
        "linux/netfilter/nf_tables.h",
        "linux/netfilter_ipv4.h",
        "linux/netfilter_ipv6.h",
        "linux/netlink.h",
        "linux/quota.h",
        "linux/random.h",
        "linux/reboot.h",
        "linux/rtnetlink.h",
        "linux/seccomp.h",
        "linux/sockios.h",
        "linux/vm_sockets.h",
        "sys/auxv.h",
    }

    // note: aio.h must be included before sys/mount.h
    headers! {
        cfg:
        "sys/xattr.h",
        "sys/sysinfo.h",
        "aio.h",
    }

    cfg.type_name(move |ty, is_struct, is_union| {
        match ty {
            // Just pass all these through, no need for a "struct" prefix
            "FILE" | "fd_set" | "Dl_info" | "DIR" | "Elf32_Phdr"
            | "Elf64_Phdr" | "Elf32_Shdr" | "Elf64_Shdr" | "Elf32_Sym"
            | "Elf64_Sym" | "Elf32_Ehdr" | "Elf64_Ehdr" | "Elf32_Chdr"
            | "Elf64_Chdr" => ty.to_string(),

            t if is_union => format!("union {}", t),

            t if t.ends_with("_t") => t.to_string(),

            // put `struct` in front of all structs:.
            t if is_struct => format!("struct {}", t),

            t => t.to_string(),
        }
    });

    cfg.field_name(move |struct_, field| {
        match field {
            // Our stat *_nsec fields normally don't actually exist but are part
            // of a timeval struct
            s if s.ends_with("_nsec") && struct_.starts_with("stat") => {
                s.replace("e_nsec", ".tv_nsec")
            }
            // FIXME: epoll_event.data is actuall a union in C, but in Rust
            // it is only a u64 because we only expose one field
            // http://man7.org/linux/man-pages/man2/epoll_wait.2.html
            "u64" if struct_ == "epoll_event" => "data.u64".to_string(),
            // The following structs have a field called `type` in C,
            // but `type` is a Rust keyword, so these fields are translated
            // to `type_` in Rust.
            "type_"
                if struct_ == "input_event"
                    || struct_ == "input_mask"
                    || struct_ == "ff_effect" =>
            {
                "type".to_string()
            }

            s => s.to_string(),
        }
    });

    cfg.skip_type(move |ty| {
        match ty {
            // FIXME: `sighandler_t` type is incorrect, see:
            // https://github.com/rust-lang/libc/issues/1359
            "sighandler_t" => true,

            // These cannot be tested when "resolv.h" is included and are tested
            // in the `linux_elf.rs` file.
            "Elf64_Phdr" | "Elf32_Phdr" => true,

            // This type is private on Linux. It is implemented as a C `enum`
            // (`c_uint`) and this clashes with the type of the `rlimit` APIs
            // which expect a `c_int` even though both are ABI compatible.
            "__rlimit_resource_t" => true,

            _ => false,
        }
    });

    cfg.skip_struct(move |ty| {
        match ty {
            // These cannot be tested when "resolv.h" is included and are tested
            // in the `linux_elf.rs` file.
            "Elf64_Phdr" | "Elf32_Phdr" => true,

            // On Linux, the type of `ut_tv` field of `struct utmpx`
            // can be an anonymous struct, so an extra struct,
            // which is absent in glibc, has to be defined.
            "__timeval" => true,

            // FIXME: This is actually a union, not a struct
            "sigval" => true,

            // This type is tested in the `linux_termios.rs` file since there
            // are header conflicts when including them with all the other
            // structs.
            "termios2" => true,

            // FIXME: musl version using by mips build jobs 1.0.15 is ancient:
            "ifmap" | "ifreq" | "ifconf" if mips32_musl => true,

            // FIXME: remove once Ubuntu 20.04 LTS is released, somewhere in 2020.
            // ucontext_t added a new field as of glibc 2.28; our struct definition is
            // conservative and omits the field, but that means the size doesn't match for newer
            // glibcs (see https://github.com/rust-lang/libc/issues/1410)
            "ucontext_t" if gnu => true,

            _ => false,
        }
    });

    cfg.skip_const(move |name| {
        match name {
            // These constants are not available if gnu headers have been included
            // and can therefore not be tested here
            //
            // The IPV6 constants are tested in the `linux_ipv6.rs` tests:
            | "IPV6_FLOWINFO"
            | "IPV6_FLOWLABEL_MGR"
            | "IPV6_FLOWINFO_SEND"
            | "IPV6_FLOWINFO_FLOWLABEL"
            | "IPV6_FLOWINFO_PRIORITY"
            // The F_ fnctl constants are tested in the `linux_fnctl.rs` tests:
            | "F_CANCELLK"
            | "F_ADD_SEALS"
            | "F_GET_SEALS"
            | "F_SEAL_SEAL"
            | "F_SEAL_SHRINK"
            | "F_SEAL_GROW"
            | "F_SEAL_WRITE" => true,

            // The musl-sanitized kernel headers used in CI
            // target the Linux kernel 4.4 and do not contain the
            // following constants:
            //
            // Requires Linux kernel 4.9
            | "FALLOC_FL_UNSHARE_RANGE"
            //
            // Require Linux kernel 5.x:
            | "MSG_COPY"
               if musl  => true,
            // Require Linux kernel 5.1:
            "F_SEAL_FUTURE_WRITE" => true,

            // The musl version 1.0.22 used in CI does not
            // contain these glibc constants yet:
            | "RLIMIT_RTTIME" // should be in `resource.h`
            | "TCP_COOKIE_TRANSACTIONS"  // should be in the `netinet/tcp.h` header
                if musl => true,

            // FIXME: deprecated: not available in any header
            // See: https://github.com/rust-lang/libc/issues/1356
            "ENOATTR" => true,

            // FIXME: SIGUNUSED was removed in glibc 2.26
            // Users should use SIGSYS instead.
            "SIGUNUSED" => true,

            // FIXME: conflicts with glibc headers and is tested in
            // `linux_termios.rs` below:
            "BOTHER" => true,

            // FIXME: on musl the pthread types are defined a little differently
            // - these constants are used by the glibc implementation.
            n if musl && n.contains("__SIZEOF_PTHREAD") => true,

            // FIXME: musl version 1.0.15 used by mips build jobs is ancient
            t if mips32_musl && t.starts_with("IFF") => true,
            "MFD_HUGETLB" | "AF_XDP" | "PF_XDP" if mips32_musl => true,

            _ => false,
        }
    });

    cfg.skip_fn(move |name| {
        // skip those that are manually verified
        match name {
            // FIXME: https://github.com/rust-lang/libc/issues/1272
            "execv" | "execve" | "execvp" | "execvpe" | "fexecve" => true,

            // There are two versions of the sterror_r function, see
            //
            // https://linux.die.net/man/3/strerror_r
            //
            // An XSI-compliant version provided if:
            //
            // (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
            //  && ! _GNU_SOURCE
            //
            // and a GNU specific version provided if _GNU_SOURCE is defined.
            //
            // libc provides bindings for the XSI-compliant version, which is
            // preferred for portable applications.
            //
            // We skip the test here since here _GNU_SOURCE is defined, and
            // test the XSI version below.
            "strerror_r" => true,

            // FIXME: Our API is unsound. The Rust API allows aliasing
            // pointers, but the C API requires pointers not to alias.
            // We should probably be at least using `&`/`&mut` here, see:
            // https://github.com/gnzlbg/ctest/issues/68
            "lio_listio" if musl => true,

            // FIXME: the glibc version used by the Sparc64 build jobs
            // which use Debian 10.0 is too old.
            "statx" if sparc64 => true,

            _ => false,
        }
    });

    cfg.skip_field_type(move |struct_, field| {
        // This is a weird union, don't check the type.
        (struct_ == "ifaddrs" && field == "ifa_ifu") ||
        // sighandler_t type is super weird
        (struct_ == "sigaction" && field == "sa_sigaction") ||
        // __timeval type is a patch which doesn't exist in glibc
        (struct_ == "utmpx" && field == "ut_tv") ||
        // sigval is actually a union, but we pretend it's a struct
        (struct_ == "sigevent" && field == "sigev_value") ||
        // this one is an anonymous union
        (struct_ == "ff_effect" && field == "u")
    });

    cfg.volatile_item(|i| {
        use ctest::VolatileItemKind::*;
        match i {
            // aio_buf is a volatile void** but since we cannot express that in
            // Rust types, we have to explicitly tell the checker about it here:
            StructField(ref n, ref f) if n == "aiocb" && f == "aio_buf" => {
                true
            }
            _ => false,
        }
    });

    cfg.skip_field(move |struct_, field| {
        // this is actually a union on linux, so we can't represent it well and
        // just insert some padding.
        (struct_ == "siginfo_t" && field == "_pad") ||
        // musl names this __dummy1 but it's still there
        (musl && struct_ == "glob_t" && field == "gl_flags") ||
        // musl seems to define this as an *anonymous* bitfield
        (musl && struct_ == "statvfs" && field == "__f_unused") ||
        // sigev_notify_thread_id is actually part of a sigev_un union
        (struct_ == "sigevent" && field == "sigev_notify_thread_id") ||
        // signalfd had SIGSYS fields added in Linux 4.18, but no libc release
        // has them yet.
        (struct_ == "signalfd_siginfo" && (field == "ssi_addr_lsb" ||
                                           field == "_pad2" ||
                                           field == "ssi_syscall" ||
                                           field == "ssi_call_addr" ||
                                           field == "ssi_arch"))
    });

    cfg.skip_roundtrip(move |s| match s {
        // FIXME: TODO
        "_libc_fpstate" | "user_fpregs_struct" if x86_64 => true,
        "utsname"
        | "statx"
        | "dirent"
        | "dirent64"
        | "utmpx"
        | "user"
        | "user_fpxregs_struct" => true,
        "sysinfo" if musl => true,
        "ucontext_t" if x86_64 && musl => true,
        "sockaddr_un" | "sembuf" | "ff_constant_effect"
            if mips32 && (gnu || musl) =>
        {
            true
        }
        "ipv6_mreq"
        | "sockaddr_in6"
        | "sockaddr_ll"
        | "in_pktinfo"
        | "arpreq"
        | "arpreq_old"
        | "sockaddr_un"
        | "ff_constant_effect"
        | "ff_ramp_effect"
        | "ff_condition_effect"
        | "Elf32_Ehdr"
        | "Elf32_Chdr"
        | "ucred"
        | "in6_pktinfo"
        | "sockaddr_nl"
        | "termios"
        | "nlmsgerr"
            if (mips64 || sparc64) && gnu =>
        {
            true
        }
        "mcontext_t" if s390x => true,

        _ => false,
    });

    cfg.generate("../src/lib.rs", "main.rs");

    test_linux_like_apis(target);
}

// This function tests APIs that are incompatible to test when other APIs
// are included (e.g. because including both sets of headers clashes)
fn test_linux_like_apis(target: &str) {
    let musl = target.contains("musl");
    let linux = target.contains("linux");
    let emscripten = target.contains("emscripten");
    let android = target.contains("android");
    assert!(linux || android || emscripten);

    if linux || android || emscripten {
        // test strerror_r from the `string.h` header
        let mut cfg = ctest::TestGenerator::new();
        cfg.skip_type(|_| true).skip_static(|_| true);

        headers! { cfg: "string.h" }
        cfg.skip_fn(|f| match f {
            "strerror_r" => false,
            _ => true,
        })
        .skip_const(|_| true)
        .skip_struct(|_| true);
        cfg.generate("../src/lib.rs", "linux_strerror_r.rs");
    }

    if linux || android || emscripten {
        // test fcntl - see:
        // http://man7.org/linux/man-pages/man2/fcntl.2.html
        let mut cfg = ctest::TestGenerator::new();

        if musl {
            cfg.header("fcntl.h");
        } else {
            cfg.header("linux/fcntl.h");
        }

        cfg.skip_type(|_| true)
            .skip_static(|_| true)
            .skip_struct(|_| true)
            .skip_fn(|_| true)
            .skip_const(move |name| match name {
                // test fcntl constants:
                "F_CANCELLK" | "F_ADD_SEALS" | "F_GET_SEALS"
                | "F_SEAL_SEAL" | "F_SEAL_SHRINK" | "F_SEAL_GROW"
                | "F_SEAL_WRITE" => false,
                _ => true,
            })
            .type_name(move |ty, is_struct, is_union| match ty {
                t if is_struct => format!("struct {}", t),
                t if is_union => format!("union {}", t),
                t => t.to_string(),
            });

        cfg.generate("../src/lib.rs", "linux_fcntl.rs");
    }

    if linux || android {
        // test termios
        let mut cfg = ctest::TestGenerator::new();
        cfg.header("asm/termbits.h");
        cfg.skip_type(|_| true)
            .skip_static(|_| true)
            .skip_fn(|_| true)
            .skip_const(|c| c != "BOTHER")
            .skip_struct(|s| s != "termios2")
            .type_name(move |ty, is_struct, is_union| match ty {
                t if is_struct => format!("struct {}", t),
                t if is_union => format!("union {}", t),
                t => t.to_string(),
            });
        cfg.generate("../src/lib.rs", "linux_termios.rs");
    }

    if linux || android {
        // test IPV6_ constants:
        let mut cfg = ctest::TestGenerator::new();
        headers! {
            cfg:
            "linux/in6.h"
        }
        cfg.skip_type(|_| true)
            .skip_static(|_| true)
            .skip_fn(|_| true)
            .skip_const(|_| true)
            .skip_struct(|_| true)
            .skip_const(move |name| match name {
                "IPV6_FLOWINFO"
                | "IPV6_FLOWLABEL_MGR"
                | "IPV6_FLOWINFO_SEND"
                | "IPV6_FLOWINFO_FLOWLABEL"
                | "IPV6_FLOWINFO_PRIORITY" => false,
                _ => true,
            })
            .type_name(move |ty, is_struct, is_union| match ty {
                t if is_struct => format!("struct {}", t),
                t if is_union => format!("union {}", t),
                t => t.to_string(),
            });
        cfg.generate("../src/lib.rs", "linux_ipv6.rs");
    }

    if linux || android {
        // Test Elf64_Phdr and Elf32_Phdr
        // These types have a field called `p_type`, but including
        // "resolve.h" defines a `p_type` macro that expands to `__p_type`
        // making the tests for these fails when both are included.
        let mut cfg = ctest::TestGenerator::new();
        cfg.header("elf.h");
        cfg.skip_fn(|_| true)
            .skip_static(|_| true)
            .skip_fn(|_| true)
            .skip_const(|_| true)
            .type_name(move |ty, _is_struct, _is_union| ty.to_string())
            .skip_struct(move |ty| match ty {
                "Elf64_Phdr" | "Elf32_Phdr" => false,
                _ => true,
            })
            .skip_type(move |ty| match ty {
                "Elf64_Phdr" | "Elf32_Phdr" => false,
                _ => true,
            });
        cfg.generate("../src/lib.rs", "linux_elf.rs");
    }
}

fn which_freebsd() -> Option<i32> {
    let output = std::process::Command::new("freebsd-version")
        .output()
        .ok()?;
    if !output.status.success() {
        return None;
    }

    let stdout = String::from_utf8(output.stdout).ok()?;

    match &stdout {
        s if s.starts_with("11") => Some(11),
        s if s.starts_with("12") => Some(12),
        s if s.starts_with("13") => Some(13),
        _ => None,
    }
}