Chandler Carruth | d51e0a0 | 2012-04-04 22:12:04 +0000 | [diff] [blame] | 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 | |
| 10 | include(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. |
| 18 | if(CMAKE_SIZEOF_VOID_P EQUAL 4) |
| 19 | set(TARGET_X86_64_CFLAGS "-m64") |
| 20 | set(TARGET_I386_CFLAGS "") |
| 21 | else() |
| 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") |
| 27 | endif() |
| 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. |
| 33 | set(SIMPLE_SOURCE64 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple64.c) |
| 34 | file(WRITE ${SIMPLE_SOURCE64} "#include <stdlib.h>\nint main() {}") |
| 35 | try_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 | |
| 39 | set(SIMPLE_SOURCE32 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple32.c) |
| 40 | file(WRITE ${SIMPLE_SOURCE32} "#include <stdlib.h>\nint main() {}") |
| 41 | try_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 | |
| 45 | add_subdirectory(lib) |
| 46 | |
| 47 | if(LLVM_INCLUDE_TESTS) |
| 48 | add_subdirectory(test) |
| 49 | endif() |