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# CMake build for CompilerRT.
#
# This build assumes that CompilerRT is checked out into the
# 'projects/compiler-rt' inside of an LLVM tree, it is not a stand-alone build
# system.
#
# An important constraint of the build is that it only produces libraries
# based on the ability of the host toolchain to target various platforms.
include(LLVMParseArguments)
# The CompilerRT build system requires CMake version 2.8.8 or higher in order
# to use its support for building convenience "libraries" as a collection of
# .o files. This is particularly useful in producing larger, more complex
# runtime libraries.
cmake_minimum_required(VERSION 2.8.8)
# FIXME: Below we assume that the target build of LLVM/Clang is x86, which is
# not at all valid. Much of this can be fixed just by switching to use
# a just-built-clang binary for the compiles.
# Detect whether the current target platform is 32-bit or 64-bit, and setup
# the correct commandline flags needed to attempt to target 32-bit and 64-bit.
if(CMAKE_SIZEOF_VOID_P EQUAL 4 OR LLVM_BUILD_32_BITS)
set(TARGET_X86_64_CFLAGS "-m64")
set(TARGET_I386_CFLAGS "")
else()
if(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
message(FATAL_ERROR "Please use a sane architecture with 4 or 8 byte pointers.")
endif()
set(TARGET_X86_64_CFLAGS "")
set(TARGET_I386_CFLAGS "-m32")
endif()
# Try to compile a very simple source file to ensure we can target the given
# platform. We use the results of these tests to build only the various target
# runtime libraries supported by our current compilers cross-compiling
# abilities.
set(SIMPLE_SOURCE64 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple64.c)
file(WRITE ${SIMPLE_SOURCE64} "#include <stdlib.h>\nint main() {}")
try_compile(CAN_TARGET_X86_64 ${CMAKE_BINARY_DIR} ${SIMPLE_SOURCE64}
COMPILE_DEFINITIONS "${TARGET_X86_64_CFLAGS}"
CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS:STRING=${TARGET_X86_64_CFLAGS}")
set(SIMPLE_SOURCE32 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple32.c)
file(WRITE ${SIMPLE_SOURCE32} "#include <stdlib.h>\nint main() {}")
try_compile(CAN_TARGET_I386 ${CMAKE_BINARY_DIR} ${SIMPLE_SOURCE32}
COMPILE_DEFINITIONS "${TARGET_I386_CFLAGS}"
CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS:STRING=${TARGET_I386_CFLAGS}")
if(LLVM_ANDROID_TOOLCHAIN_DIR)
if(EXISTS ${LLVM_ANDROID_TOOLCHAIN_DIR}/arm-linux-androideabi)
set(CAN_TARGET_ARM_ANDROID 1)
set(TARGET_ARM_ANDROID_CFLAGS
-target arm-linux-androideabi
--sysroot=${LLVM_ANDROID_TOOLCHAIN_DIR}/sysroot
-B${LLVM_ANDROID_TOOLCHAIN_DIR}
)
else()
set(CAN_TARGET_ARM_ANDROID 0)
endif()
# TODO: support i686 and MIPS Android toolchains
endif()
function(filter_available_targets out_var)
set(archs)
foreach(arch ${ARGN})
if(${arch} STREQUAL "x86_64" AND CAN_TARGET_X86_64)
list(APPEND archs ${arch})
elseif (${arch} STREQUAL "i386" AND CAN_TARGET_I386)
list(APPEND archs ${arch})
endif()
endforeach()
set(${out_var} ${archs} PARENT_SCOPE)
endfunction()
# Provide some common commmandline flags for Sanitizer runtimes.
set(SANITIZER_COMMON_CFLAGS
-fPIC
-fno-exceptions
-funwind-tables
-fvisibility=hidden
)
if(SUPPORTS_NO_VARIADIC_MACROS_FLAG)
list(APPEND SANITIZER_COMMON_CFLAGS -Wno-variadic-macros)
endif()
check_cxx_compiler_flag(-Wno-c99-extensions
SUPPORTS_NO_C99_EXTENSIONS_FLAG)
if(SUPPORTS_NO_C99_EXTENSIONS_FLAG)
list(APPEND SANITIZER_COMMON_CFLAGS -Wno-c99-extensions)
endif()
# Because compiler-rt spends a lot of time setting up custom compile flags,
# define a handy helper function for it. The compile flags setting in CMake
# has serious issues that make its syntax challenging at best.
function(set_target_compile_flags target)
foreach(arg ${ARGN})
set(argstring "${argstring} ${arg}")
endforeach()
set_property(TARGET ${target} PROPERTY COMPILE_FLAGS "${argstring}")
endfunction()
# Add the public header's directory to the includes for all of compiler-rt.
include_directories(include)
# Build utils before building compiler-rt library.
add_subdirectory(utils)
add_subdirectory(lib)
if(LLVM_INCLUDE_TESTS)
# Currently the tests have not been ported to CMake, so disable this
# directory.
#
#add_subdirectory(test)
endif()
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