Build fails with SIMULATOR and default parameters about ios-cmake HOT 4 CLOSED

Hmm.. I'll have to verify this at work tomorrow. But it seems some of the flags are being overridden somehow by the CMakeLists.txt in the protobuf project. Is it the standard google protobuf repo you are trying to build with the toolchain?

from ios-cmake.

Yes, standard repo (not the latest master though), but the build process is somewhat not trivial, because build requires some binaries on host system:

git clone https://github.com/google/protobuf
(cd ./protobuf ; git checkout 80a37e0782d2d702d52234b62dd4b9ec74fd2c95)
cmake -DCMAKE_BUILD_TYPE=Debug -Dprotobuf_BUILD_TESTS=OFF -H./protobuf/cmake -B./protobuf/host_build # build for host to get js_embed
VERBOSE=1 cmake --build ./protobuf/host_build
sed -i .bak "s~COMMAND js_embed~COMMAND $(pwd)/protobuf/host_build/js_embed~" ./protobuf/cmake/libprotoc.cmake
cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_TOOLCHAIN_FILE=$(pwd)/ios-cmake/ios.toolchain.cmake -DIOS_PLATFORM=SIMULATOR -DCMAKE_INSTALL_PREFIX=./dependencies -Dprotobuf_BUILD_TESTS=OFF -H./protobuf/cmake -B./protobuf/.build
VERBOSE=1 cmake --build ./protobuf/.build --target install

from ios-cmake.

So, i have now checked the situation, and it all seems very reasonable for Apple not to include bitcode in ARClite for simulator builds. Bitcode is only used by Apple for recompiling the binary blobs for newer SDKs and such. And since simulator slices are removed (more like prohibited by Apple) in AppStore-builds, there is little to no reason for them to supply bitcode in ARClite for simulator builds.

After digging through the protobuf code, my recommendation to you is to simply build libprotobuf without ARC, by supplying -DENABLE_ARC=0.

So, the correct commands would look like:

git clone https://github.com/google/protobuf
(cd ./protobuf ; git checkout 80a37e0782d2d702d52234b62dd4b9ec74fd2c95)
cmake -DCMAKE_BUILD_TYPE=Debug -Dprotobuf_BUILD_TESTS=OFF -H./protobuf/cmake -B./protobuf/host_build # build for host to get js_embed
VERBOSE=1 cmake --build ./protobuf/host_build
sed -i .bak "s~COMMAND js_embed~COMMAND $(pwd)/protobuf/host_build/js_embed~" ./protobuf/cmake/libprotoc.cmake
cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_TOOLCHAIN_FILE=$(pwd)/ios-cmake/ios.toolchain.cmake -DIOS_PLATFORM=SIMULATOR -DENABLE_ARC=0 -DCMAKE_INSTALL_PREFIX=./dependencies -Dprotobuf_BUILD_TESTS=OFF -H./protobuf/cmake -B./protobuf/.build
VERBOSE=1 cmake --build ./protobuf/.build --target install

The resulting files under .dependencies will contain the LLVM slices required.

This way, you would be able to build with bitcode (but with ARC disabled for libprotobuf, since it seems that there is no need for it), even for the simulator (to ease one´s life a little). :)

from ios-cmake.

I will close this issue, since it is more a problem with documentation of the protobuf library, than an error with this toolchain.

from ios-cmake.