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 # Add path for custom modules
21 "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules"
24 set(COMPILER_RT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
26 # FIXME: Below we assume that the target build of LLVM/Clang is x86, which is
27 # not at all valid. Much of this can be fixed just by switching to use
28 # a just-built-clang binary for the compiles.
30 # Detect whether the current target platform is 32-bit or 64-bit, and setup
31 # the correct commandline flags needed to attempt to target 32-bit and 64-bit.
32 if(CMAKE_SIZEOF_VOID_P EQUAL 4 OR LLVM_BUILD_32_BITS)
33 set(TARGET_X86_64_CFLAGS "-m64")
34 set(TARGET_I386_CFLAGS "")
36 if(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
37 message(FATAL_ERROR "Please use a sane architecture with 4 or 8 byte pointers.")
39 set(TARGET_X86_64_CFLAGS "")
40 set(TARGET_I386_CFLAGS "-m32")
43 function(get_target_flags_for_arch arch out_var)
44 if(${arch} STREQUAL "x86_64")
45 set(${out_var} ${TARGET_X86_64_CFLAGS} PARENT_SCOPE)
46 elseif(${arch} STREQUAL "i386")
47 set(${out_var} ${TARGET_I386_CFLAGS} PARENT_SCOPE)
49 message(FATAL_ERROR "Unsupported architecture: ${arch}")
53 # Try to compile a very simple source file to ensure we can target the given
54 # platform. We use the results of these tests to build only the various target
55 # runtime libraries supported by our current compilers cross-compiling
57 set(SIMPLE_SOURCE64 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple64.c)
58 file(WRITE ${SIMPLE_SOURCE64} "#include <stdlib.h>\nint main() {}")
59 try_compile(CAN_TARGET_X86_64 ${CMAKE_BINARY_DIR} ${SIMPLE_SOURCE64}
60 COMPILE_DEFINITIONS "${TARGET_X86_64_CFLAGS}"
61 CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS:STRING=${TARGET_X86_64_CFLAGS}")
63 set(SIMPLE_SOURCE32 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple32.c)
64 file(WRITE ${SIMPLE_SOURCE32} "#include <stdlib.h>\nint main() {}")
65 try_compile(CAN_TARGET_I386 ${CMAKE_BINARY_DIR} ${SIMPLE_SOURCE32}
66 COMPILE_DEFINITIONS "${TARGET_I386_CFLAGS}"
67 CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS:STRING=${TARGET_I386_CFLAGS}")
69 function(filter_available_targets out_var)
72 if(${arch} STREQUAL "x86_64" AND CAN_TARGET_X86_64)
73 list(APPEND archs ${arch})
74 elseif (${arch} STREQUAL "i386" AND CAN_TARGET_I386)
75 list(APPEND archs ${arch})
78 set(${out_var} ${archs} PARENT_SCOPE)
81 # Provide some common commmandline flags for Sanitizer runtimes.
82 set(SANITIZER_COMMON_CFLAGS
91 list(APPEND SANITIZER_COMMON_CFLAGS -fvisibility=hidden)
93 # Build sanitizer runtimes with debug info.
94 check_cxx_compiler_flag(-gline-tables-only SUPPORTS_GLINE_TABLES_ONLY_FLAG)
95 if(SUPPORTS_GLINE_TABLES_ONLY_FLAG)
96 list(APPEND SANITIZER_COMMON_CFLAGS -gline-tables-only)
98 list(APPEND SANITIZER_COMMON_CFLAGS -g)
100 # Warnings suppressions.
101 check_cxx_compiler_flag(-Wno-variadic-macros SUPPORTS_NO_VARIADIC_MACROS_FLAG)
102 if(SUPPORTS_NO_VARIADIC_MACROS_FLAG)
103 list(APPEND SANITIZER_COMMON_CFLAGS -Wno-variadic-macros)
105 check_cxx_compiler_flag(-Wno-c99-extensions SUPPORTS_NO_C99_EXTENSIONS_FLAG)
106 if(SUPPORTS_NO_C99_EXTENSIONS_FLAG)
107 list(APPEND SANITIZER_COMMON_CFLAGS -Wno-c99-extensions)
110 list(APPEND SANITIZER_COMMON_CFLAGS -mmacosx-version-min=10.5)
113 # Because compiler-rt spends a lot of time setting up custom compile flags,
114 # define a handy helper function for it. The compile flags setting in CMake
115 # has serious issues that make its syntax challenging at best.
116 function(set_target_compile_flags target)
118 set(argstring "${argstring} ${arg}")
120 set_property(TARGET ${target} PROPERTY COMPILE_FLAGS "${argstring}")
123 function(set_target_link_flags target)
125 set(argstring "${argstring} ${arg}")
127 set_property(TARGET ${target} PROPERTY LINK_FLAGS "${argstring}")
130 # Compute the Clang version from the LLVM version.
131 # FIXME: We should be able to reuse CLANG_VERSION variable calculated
132 # in Clang cmake files, instead of copying the rules here.
133 string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
135 # Setup the paths where compiler-rt runtimes and headers should be stored.
136 set(LIBCLANG_INSTALL_PATH lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION})
137 string(TOLOWER ${CMAKE_SYSTEM_NAME} LIBCLANG_OS_DIR)
139 # Install compiler-rt headers.
140 install(DIRECTORY include/
141 DESTINATION ${LIBCLANG_INSTALL_PATH}/include
144 PATTERN ".svn" EXCLUDE
147 # Call add_clang_compiler_rt_libraries to make sure that targets are built
148 # and installed in the directories where Clang driver expects to find them.
149 macro(add_clang_compiler_rt_libraries)
150 # Setup output directories so that clang in build tree works.
151 set_target_properties(${ARGN} PROPERTIES
152 ARCHIVE_OUTPUT_DIRECTORY
153 ${LLVM_BINARY_DIR}/lib/clang/${CLANG_VERSION}/lib/${LIBCLANG_OS_DIR}
154 LIBRARY_OUTPUT_DIRECTORY
155 ${LLVM_BINARY_DIR}/lib/clang/${CLANG_VERSION}/lib/${LIBCLANG_OS_DIR}
157 # Add installation command.
158 install(TARGETS ${ARGN}
159 ARCHIVE DESTINATION ${LIBCLANG_INSTALL_PATH}/lib/${LIBCLANG_OS_DIR}
160 LIBRARY DESTINATION ${LIBCLANG_INSTALL_PATH}/lib/${LIBCLANG_OS_DIR}
162 endmacro(add_clang_compiler_rt_libraries)
164 # Add the public header's directory to the includes for all of compiler-rt.
165 include_directories(include)
167 add_subdirectory(lib)
169 if(LLVM_INCLUDE_TESTS)
170 # Currently the tests have not been ported to CMake, so disable this
173 #add_subdirectory(test)