1# CMake build for CompilerRT. 2# 3# This build assumes that CompilerRT is checked out into the 4# 'projects/compiler-rt' inside of an LLVM tree, it is not a stand-alone build 5# system. 6# 7# An important constraint of the build is that it only produces libraries 8# based on the ability of the host toolchain to target various platforms. 9 10include(LLVMParseArguments) 11 12# FIXME: Below we assume that the target build of LLVM/Clang is x86, which is 13# not at all valid. Much of this can be fixed just by switching to use 14# a just-built-clang binary for the compiles. 15 16# Detect whether the current target platform is 32-bit or 64-bit, and setup 17# the correct commandline flags needed to attempt to target 32-bit and 64-bit. 18if(CMAKE_SIZEOF_VOID_P EQUAL 4) 19 set(TARGET_X86_64_CFLAGS "-m64") 20 set(TARGET_I386_CFLAGS "") 21else() 22 if(NOT CMAKE_SIZEOF_VOID_P EQUAL 8) 23 message(FATAL_ERROR "Please use a sane architecture with 4 or 8 byte pointers.") 24 endif() 25 set(TARGET_X86_64_CFLAGS "") 26 set(TARGET_I386_CFLAGS "-m32") 27endif() 28 29# Try to compile a very simple source file to ensure we can target the given 30# platform. We use the results of these tests to build only the various target 31# runtime libraries supported by our current compilers cross-compiling 32# abilities. 33set(SIMPLE_SOURCE64 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple64.c) 34file(WRITE ${SIMPLE_SOURCE64} "#include <stdlib.h>\nint main() {}") 35try_compile(CAN_TARGET_X86_64 ${CMAKE_BINARY_DIR} ${SIMPLE_SOURCE64} 36 COMPILE_DEFINITIONS "${TARGET_X86_64_CFLAGS}" 37 CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS:STRING=${TARGET_X86_64_CFLAGS}") 38 39set(SIMPLE_SOURCE32 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple32.c) 40file(WRITE ${SIMPLE_SOURCE32} "#include <stdlib.h>\nint main() {}") 41try_compile(CAN_TARGET_I386 ${CMAKE_BINARY_DIR} ${SIMPLE_SOURCE32} 42 COMPILE_DEFINITIONS "${TARGET_I386_CFLAGS}" 43 CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS:STRING=${TARGET_I386_CFLAGS}") 44 45add_subdirectory(lib) 46 47if(LLVM_INCLUDE_TESTS) 48 add_subdirectory(test) 49endif() 50