Add compiler-rt project #88
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This was referenced Jul 16, 2017
jbush001
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compiler-rt is now build and installed by the compiler. It will be linked into apps by default. I had to do a number of hacks to get this to work: - All of the build files assume that, if you are cross compiling and the host is a mac, OSX must be the target OS (they use if (APPLE) to do this). While this is usually true, it's not in this case. I've ANDed it with XXX_DISABLE_NYUZI everywhere. - When there was no OS specified, the build system was using the host OS when building the path to the runtime library. So, it would end up in '/usr/local/llvm-nyuzi/lib/clang/7.0.0/darwin'. When building this library path, the linker does not add the host OS. I changed this to leave the OS blank. - CMAKE_SIZEOF_VOID_P is not specified when building Nyuzi for some reason. I added a hack to hard code it to 4 if not set. - In lib/builtins/CMakeLists.txt, explicitly disabled areas that add sources that don't build with Nyuzi (because of library dependencies). This could be cleaned up to properly detect a Nyuzi build.
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https://compiler-rt.llvm.org/ There is currently a minimal subset of assembly runtime functions in https://github.com/jbush001/NyuziProcessor/tree/master/software/libs/compiler-rt that could be copied into the architecture specific directory. The challenging part is getting this to be built as a cross compiler. See:
http://lists.llvm.org/pipermail/llvm-dev/2016-May/099179.html
https://reviews.llvm.org/D19742
Modify clang to automatically link in this library, in tools/clang/lib/Driver/ToolChains/Nyuzi.cpp, nyuzi::Linker::ConstructJob by calling tools::AddRunTimeLibs.
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