Something I've been working on lately is cross-compiling Wine for 32-bit Mac from newer 64-bit-only macOS versions (10.15 and newer). This should be especially useful for anyone packaging Wine for macOS.
The first part needed is a toolchain. Apple's last official toolchain to support targeting i386 is Xcode 9.4.1 and the 10.13 SDK, but this is unable to run on any OS newer than 10.14.
To fix this, I've created a hack that allows the Xcode 9.4.1 toolchain to be used on newer OSes: https://github.com/mrpippy/XcodeNueve
With the toolchain working, building i386 with it is now a cross-compile. Apple does not prefix the commands with the host triplet though (i.e. 'i386-apple-darwin'), which Wine seems to expect for cross-compiling.
Specifically, configure adds "-b <host triplet>" to TARGETFLAGS, causing winebuild to search for commands like ld and nm prefixed with that host triplet, which fails.
This is a patch which only sets that TARGETFLAGS when the host triplet appears in $CC. I'm open to a different approach to fixing this though.
Here's the command I use to configure, assuming the modified Xcode 9.4.1 is at /Applications/Xcode9.app:
DEVELOPER_DIR="/Applications/Xcode9.app" \ SDKROOT="/Applications/Xcode9.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk" \ ../configure --host=i386-apple-darwin \ --with-wine-tools=<path to wine64 build> --with-wine64=<path to wine64 build> \ CC="clang -arch i386" TARGETFLAGS="-m32"
Make also needs to be run with DEVELOPER_DIR and SDKROOT set. And this also works on Apple Silicon, just run with 'arch -x86_64'
Brendan Shanks (1): configure: Only set TARGETFLAGS when cross-compiling with host-prefixed tools.
configure.ac | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)