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extconf: add sdk helper, primarily for macOS #757

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extconf: add sdk helper, primarily for macOS #757

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17 changes: 16 additions & 1 deletion ext/ffi_c/extconf.rb
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Expand Up @@ -4,11 +4,26 @@
require 'mkmf'
require 'rbconfig'

# Recent versions of macOS have removed /usr/include, which without this
# would break the logic below around finding/using the perfectly usable
# system libffi.
def sdk_path_if_needed
if File.exist?("/usr/include")
""
elsif File.exist?("/Applications/Xcode.app")
"/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk"
elsif File.exist?("/Library/Developer/CommandLineTools")
"/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk"
else
""
end
end

def system_libffi_usable?
# We need pkg_config or ffi.h
libffi_ok = pkg_config("libffi") ||
have_header("ffi.h") ||
find_header("ffi.h", "/usr/local/include", "/usr/include/ffi")
find_header("ffi.h", "/usr/local/include", "#{sdk_path_if_needed}/usr/include/ffi")

# Ensure we can link to ffi_call
libffi_ok &&= have_library("ffi", "ffi_call", [ "ffi.h" ]) ||
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