Cross compiling from Linux to Windows doesn't work

[999eagle]

I would like to be able to cross compile mozjs from Linux to Windows, but cargo build --target x86_64-pc-windows-gnu fails with this error:

error: failed to run custom build command for `mozjs_sys v0.61.13`

Caused by:
  process didn't exit successfully: `/home/sophie/temp/minimal-mozjs/target/debug/build/mozjs_sys-fff148f5ad053bb7/build-script-build` (exit code: 101)
--- stderr
thread 'main' panicked at 'assertion failed: `(left == right)`
  left: `"x86_64-unknown-linux-gnu"`,
 right: `"x86_64-pc-windows-msvc"`: Only cross-compiling from x64 is supported', /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.13/build.rs:23:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

warning: build failed, waiting for other jobs to finish...
error: build failed

This was tried in a minimal project containing only a dependency on mozjs v0.10.1. I have a toolchain set up for cross-compiling and didn't have any problems with cross compiling other -sys libraries.

[jdm]

You can try commenting out the check in build.rs.

[999eagle]

Commenting out the check gave me this error:

error: failed to run custom build command for `mozjs_sys v0.61.13`

Caused by:
  process didn't exit successfully: `/home/sophie/temp/minimal-mozjs/target/debug/build/mozjs_sys-fff148f5ad053bb7/build-script-build` (exit code: 101)
--- stderr
makefile.cargo:168: *** recipe commences before first target.  Stop.
thread 'main' panicked at 'assertion failed: result.success()', /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.13/build.rs:136:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

So I've downgraded to mozjs-sys 0.61.8, which didn't have the check and no special configuration for cross-compiling from x64 Windows to x86 Windows. There I'm getting this error:

error: failed to run custom build command for `mozjs_sys v0.61.8`

Caused by:
  process didn't exit successfully: `/home/sophie/temp/minimal-mozjs/target/debug/build/mozjs_sys-341a404da2fa6945/build-script-build` (exit code: 101)
--- stdout
[[ /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure -ot /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure.in ]] && touch /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure || true
[[ /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/old-configure -ot /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/old-configure.in ]] && touch /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/old-configure || true
! [[ /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure.in -ot /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure ]] && touch /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure || true
! [[ /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/old-configure.in -ot /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/old-configure ]] && touch /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/old-configure || true
if [[ /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure -nt /home/sophie/temp/minimal-mozjs/target/x86_64-pc-windows-gnu/debug/build/mozjs_sys-07137dbc4f3723bc/out/config.status ]] ; then \
  cd /home/sophie/temp/minimal-mozjs/target/x86_64-pc-windows-gnu/debug/build/mozjs_sys-07137dbc4f3723bc/out && \
  PYTHON="" MOZ_TOOLS="" \
  CC="x86_64-pc-windows-gnu-gcc" CFLAGS="" \
  CPP="x86_64-pc-windows-gnu-gcc -E" CPPFLAGS="" \
  CXX="x86_64-pc-windows-gnu-g++" CXXFLAGS="" \
  AS="" AR="x86_64-pc-windows-gnu-ar" \
  STLPORT_LIBS="" \
  /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure --disable-jemalloc --disable-js-shell --disable-tests --disable-shared-js --build-backends=RecursiveMake --target=x86_64-pc-windows-gnu --disable-gold --disable-shared-js || (cat config.log && exit 1) ; \
fi
Creating Python environment
New python executable in /home/sophie/temp/minimal-mozjs/target/x86_64-pc-windows-gnu/debug/build/mozjs_sys-07137dbc4f3723bc/out/_virtualenv/bin/python2.7
Also creating executable in /home/sophie/temp/minimal-mozjs/target/x86_64-pc-windows-gnu/debug/build/mozjs_sys-07137dbc4f3723bc/out/_virtualenv/bin/python
Installing setuptools, pip, wheel...done.
running build_ext
copying build/lib.linux-x86_64-2.7/psutil/_psutil_linux.so -> psutil
copying build/lib.linux-x86_64-2.7/psutil/_psutil_posix.so -> psutil

Error processing command. Ignoring because optional. (optional:packages.txt:comm/build/virtualenv_packages.txt)
Reexecuting in the virtualenv
checking for vcs source checkout... no
checking for a shell... /usr/bin/sh
checking for host system type... x86_64-pc-linux-gnu
checking for target system type... INFO: checking for vcs source checkout...
INFO: no
INFO: checking for a shell...
INFO: /usr/bin/sh
INFO: checking for host system type...
INFO: x86_64-pc-linux-gnu
INFO: checking for target system type...

--- stderr
Invalid configuration `x86_64-pc-windows-gnu': machine `x86_64-pc-windows' not recognized
Traceback (most recent call last):
  File "/home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/../../configure.py", line 127, in <module>
    sys.exit(main(sys.argv))

--- snip ---

  File "/home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/build/moz.configure/init.configure", line 723, in config_sub
    return subprocess.check_output([shell, config_sub, triplet]).strip()
  File "/usr/lib64/python2.7/subprocess.py", line 223, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '[u'/usr/bin/sh', u'/home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/build/moz.configure/../autoconf/config.sub', u'x86_64-pc-windows-gnu']' returned non-zero exit status 1
make: *** [makefile.cargo:173: maybe-configure] Error 1
thread 'main' panicked at 'assertion failed: result.success()', /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/build.rs:114:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

So next I changed the target to x86_64-pc-windows in makefile.cargo and got this error:

error: failed to run custom build command for `mozjs_sys v0.61.8`

Caused by:
  process didn't exit successfully: `/home/sophie/temp/minimal-mozjs/target/debug/build/mozjs_sys-341a404da2fa6945/build-script-build` (exit code: 101)
--- stdout
[[ /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure -ot /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure.in ]] && touch /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure || true
[[ /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/old-configure -ot /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/old-configure.in ]] && touch /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/old-configure || true
! [[ /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure.in -ot /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure ]] && touch /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure || true
! [[ /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/old-configure.in -ot /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/old-configure ]] && touch /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/old-configure || true
if [[ /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure -nt /home/sophie/temp/minimal-mozjs/target/x86_64-pc-windows-gnu/debug/build/mozjs_sys-07137dbc4f3723bc/out/config.status ]] ; then \
  cd /home/sophie/temp/minimal-mozjs/target/x86_64-pc-windows-gnu/debug/build/mozjs_sys-07137dbc4f3723bc/out && \
  PYTHON="" MOZ_TOOLS="" \
  CC="x86_64-pc-windows-gnu-gcc" CFLAGS="" \
  CPP="x86_64-pc-windows-gnu-gcc -E" CPPFLAGS="" \
  CXX="x86_64-pc-windows-gnu-g++" CXXFLAGS="" \
  AS="" AR="x86_64-pc-windows-gnu-ar" \
  STLPORT_LIBS="" \
  /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/mozjs/js/src/configure --disable-jemalloc --disable-js-shell --disable-tests --disable-shared-js --build-backends=RecursiveMake --target=x86_64-pc-windows --disable-gold --disable-shared-js || (cat config.log && exit 1) ; \
fi
Reexecuting in the virtualenv
checking for vcs source checkout... no
checking for a shell... /usr/bin/sh
checking for host system type... x86_64-pc-linux-gnu
checking for target system type... INFO: checking for vcs source checkout...
INFO: no
INFO: checking for a shell...
INFO: /usr/bin/sh
INFO: checking for host system type...
INFO: x86_64-pc-linux-gnu
INFO: checking for target system type...
ERROR: Unknown OS: windows

--- stderr
ERROR: Unknown OS: windows
make: *** [makefile.cargo:173: maybe-configure] Error 1
thread 'main' panicked at 'assertion failed: result.success()', /home/sophie/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.8/build.rs:114:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

I'm not sure how to continue with that error message...

[jdm]

We don't support GNU Windows targets, sorry.