forked from OSchip/llvm-project
50 lines
2.0 KiB
CMake
50 lines
2.0 KiB
CMake
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# CMake build for CompilerRT.
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#
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# This build assumes that CompilerRT is checked out into the
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# 'projects/compiler-rt' inside of an LLVM tree, it is not a stand-alone build
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# system.
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#
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# An important constraint of the build is that it only produces libraries
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# based on the ability of the host toolchain to target various platforms.
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include(LLVMParseArguments)
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# FIXME: Below we assume that the target build of LLVM/Clang is x86, which is
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# not at all valid. Much of this can be fixed just by switching to use
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# a just-built-clang binary for the compiles.
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# Detect whether the current target platform is 32-bit or 64-bit, and setup
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# the correct commandline flags needed to attempt to target 32-bit and 64-bit.
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if(CMAKE_SIZEOF_VOID_P EQUAL 4)
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set(TARGET_X86_64_CFLAGS "-m64")
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set(TARGET_I386_CFLAGS "")
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else()
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if(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
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message(FATAL_ERROR "Please use a sane architecture with 4 or 8 byte pointers.")
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endif()
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set(TARGET_X86_64_CFLAGS "")
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set(TARGET_I386_CFLAGS "-m32")
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endif()
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# Try to compile a very simple source file to ensure we can target the given
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# platform. We use the results of these tests to build only the various target
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# runtime libraries supported by our current compilers cross-compiling
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# abilities.
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set(SIMPLE_SOURCE64 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple64.c)
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file(WRITE ${SIMPLE_SOURCE64} "#include <stdlib.h>\nint main() {}")
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try_compile(CAN_TARGET_X86_64 ${CMAKE_BINARY_DIR} ${SIMPLE_SOURCE64}
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COMPILE_DEFINITIONS "${TARGET_X86_64_CFLAGS}"
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CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS:STRING=${TARGET_X86_64_CFLAGS}")
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set(SIMPLE_SOURCE32 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple32.c)
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file(WRITE ${SIMPLE_SOURCE32} "#include <stdlib.h>\nint main() {}")
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try_compile(CAN_TARGET_I386 ${CMAKE_BINARY_DIR} ${SIMPLE_SOURCE32}
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COMPILE_DEFINITIONS "${TARGET_I386_CFLAGS}"
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CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS:STRING=${TARGET_I386_CFLAGS}")
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add_subdirectory(lib)
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if(LLVM_INCLUDE_TESTS)
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add_subdirectory(test)
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endif()
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