forked from OSchip/llvm-project
95 lines
3.5 KiB
CMake
95 lines
3.5 KiB
CMake
# 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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# The CompilerRT build system requires CMake version 2.8.8 or higher in order
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# to use its support for building convenience "libraries" as a collection of
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# .o files. This is particularly useful in producing larger, more complex
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# runtime libraries.
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cmake_minimum_required(VERSION 2.8.8)
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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 OR LLVM_BUILD_32_BITS)
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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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if(LLVM_ANDROID_TOOLCHAIN_DIR)
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if(EXISTS ${LLVM_ANDROID_TOOLCHAIN_DIR}/arm-linux-androideabi)
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set(CAN_TARGET_ARM_ANDROID 1)
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set(TARGET_ARM_ANDROID_CFLAGS
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-target arm-linux-androideabi
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--sysroot=${LLVM_ANDROID_TOOLCHAIN_DIR}/sysroot
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-B${LLVM_ANDROID_TOOLCHAIN_DIR}
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)
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else()
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set(CAN_TARGET_ARM_ANDROID 0)
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endif()
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# TODO: support i686 and MIPS Android toolchains
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endif()
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function(filter_available_targets out_var)
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set(archs)
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foreach(arch ${ARGN})
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if(${arch} STREQUAL "x86_64" AND CAN_TARGET_X86_64)
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list(APPEND archs ${arch})
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elseif (${arch} STREQUAL "i386" AND CAN_TARGET_I386)
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list(APPEND archs ${arch})
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endif()
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endforeach()
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set(${out_var} ${archs} PARENT_SCOPE)
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endfunction()
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# Because compiler-rt spends a lot of time setting up custom compile flags,
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# define a handy helper function for it. The compile flags setting in CMake
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# has serious issues that make its syntax challenging at best.
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function(set_target_compile_flags target)
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foreach(arg ${ARGN})
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set(argstring "${argstring} ${arg}")
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endforeach()
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set_property(TARGET ${target} PROPERTY COMPILE_FLAGS "${argstring}")
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endfunction()
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add_subdirectory(lib)
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if(LLVM_INCLUDE_TESTS)
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# Currently the tests have not been ported to CMake, so disable this
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# directory.
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#
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#add_subdirectory(test)
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endif()
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