Home | History | Annotate | Download | only in compiler-rt 
      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()
     50