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List:       gmp-discuss
Subject:    Re: Cross compile GMP for Apple Silicon
From:       Pierre Chatelier <pierre () chachatelier ! fr>
Date:       2020-11-22 21:15:34
Message-ID: 456869A8-5F40-47EC-8453-247930D66A1A () chachatelier ! fr
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Here are scripts to cross-compile GMP from a x86_64 host for an arm64 system, and \
merge x86_64 and arm64 builds in a fat (universal) binary.

Those scripts are not perfect and will certainly be deprecated or broken some day, \
but it helps understand the process

Pierre Chatelier

======================= script to configure/compile each arch =====================
#!/bin/sh


#command line tools path can be queried by xcode-select -p
CLT="/Library/Developer/CommandLineTools"
export CC="${CLT}/usr/bin/clang"
export CXX="${CLT}/usr/bin/clang"
export LD="${CLT}/usr/bin/ld"
export AR="${CLT}/usr/bin/ar"
export AS="${CLT}/usr/bin/as"
export LIBTOOL="${CLT}/usr/bin/libtool"
export STRIP="${CLT}/usr/bin/strip"
export RANLIB="${CLT}/usr/bin/ranlib"
export NM="${CLT}/usr/bin/nm"
export STRIP="${CLT}/usr/bin/strip"

#cleanup x86_64 build
make clean
\rm -rf libs_x86_64

#configure x86_64 build (in my case explicit darwin13.0.0 instead of just darwin)
export CFLAGS=" -O2 -fno-stack-check -isysroot \
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.0.sdk \
--target=x86_64-apple-darwin13.0.0" export LDFLAGS=" -isysroot \
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.0.sdk"
                
./configure --enable-fat --build=x86_64-apple-darwin --host=x86_64-apple-darwin13.0.0
#build
make -j 12

#move x86_64 build aside
mv .libs libs_x86_64

#cleanup arm64 build
make clean
\rm -rf libs_arm64

#configure arm64 build
export CFLAGS=" -O2 -fno-stack-check -isysroot \
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.0.sdk \
--target=arm64-apple-darwin" export LDFLAGS=" -isysroot \
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.0.sdk \
                -arch arm64"
./configure --enable-fat --build=x86_64-apple-darwin --host=arm64-apple-darwin
#build
make -j 12

#move arm64 build aside
mv .libs libs_arm64

======================= script to merge binaries of different architectures  \
===================== #!/bin/sh

#cleanup .libs directory
\rm -rf .libs

#create fat libraries
mkdir .libs
lipo -create -output .libs/libgmp.10.dylib libs_x86_64/libgmp.10.dylib \
libs_arm64/libgmp.10.dylib lipo -create -output .libs/libgmp.a libs_x86_64/libgmp.a \
libs_arm64/libgmp.a cp -f libs_x86_64/libgmp.lai .libs/

#additional symbolic links
pushd .libs
ln -fs libgmp.10.dylib libgmp.dylib
ln -fs ../libgmp.la .


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