1 # CMake build for CompilerRT.
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
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.
10 include(LLVMParseArguments)
12 # The CompilerRT build system requires CMake version 2.8.8 or higher in order
13 # to use its support for building convenience "libraries" as a collection of
14 # .o files. This is particularly useful in producing larger, more complex
16 cmake_minimum_required(VERSION 2.8.8)
18 # FIXME: Below we assume that the target build of LLVM/Clang is x86, which is
19 # not at all valid. Much of this can be fixed just by switching to use
20 # a just-built-clang binary for the compiles.
22 # Detect whether the current target platform is 32-bit or 64-bit, and setup
23 # the correct commandline flags needed to attempt to target 32-bit and 64-bit.
24 if(CMAKE_SIZEOF_VOID_P EQUAL 4)
25 set(TARGET_X86_64_CFLAGS "-m64")
26 set(TARGET_I386_CFLAGS "")
28 if(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
29 message(FATAL_ERROR "Please use a sane architecture with 4 or 8 byte pointers.")
31 set(TARGET_X86_64_CFLAGS "")
32 set(TARGET_I386_CFLAGS "-m32")
35 # Try to compile a very simple source file to ensure we can target the given
36 # platform. We use the results of these tests to build only the various target
37 # runtime libraries supported by our current compilers cross-compiling
39 set(SIMPLE_SOURCE64 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple64.c)
40 file(WRITE ${SIMPLE_SOURCE64} "#include <stdlib.h>\nint main() {}")
41 try_compile(CAN_TARGET_X86_64 ${CMAKE_BINARY_DIR} ${SIMPLE_SOURCE64}
42 COMPILE_DEFINITIONS "${TARGET_X86_64_CFLAGS}"
43 CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS:STRING=${TARGET_X86_64_CFLAGS}")
45 set(SIMPLE_SOURCE32 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple32.c)
46 file(WRITE ${SIMPLE_SOURCE32} "#include <stdlib.h>\nint main() {}")
47 try_compile(CAN_TARGET_I386 ${CMAKE_BINARY_DIR} ${SIMPLE_SOURCE32}
48 COMPILE_DEFINITIONS "${TARGET_I386_CFLAGS}"
49 CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS:STRING=${TARGET_I386_CFLAGS}")
51 # Because compiler-rt spends a lot of time setting up custom compile flags,
52 # define a handy helper function for it. The compile flags setting in CMake
53 # has serious issues that make its syntax challenging at best.
54 function(set_target_compile_flags target)
56 set(argstring "${argstring} ${arg}")
58 set_property(TARGET ${target} PROPERTY COMPILE_FLAGS "${argstring}")
63 if(LLVM_INCLUDE_TESTS)
64 # Currently the tests have not been ported to CMake, so disable this
67 #add_subdirectory(test)