1 # On Windows, CMAKE_*_FLAGS are built for MSVC but we use the GCC clang.exe,
2 # which uses completely different flags. Translate some common flag types, and
4 function(translate_msvc_cflags out_flags msvc_flags)
5 # Insert an empty string in the list to simplify processing.
6 set(msvc_flags ";${msvc_flags}")
8 # Canonicalize /flag to -flag.
9 string(REPLACE ";/" ";-" msvc_flags "${msvc_flags}")
11 # Make space separated -D and -U flags into joined flags.
12 string(REGEX REPLACE ";-\([DU]\);" ";-\\1" msvc_flags "${msvc_flags}")
15 foreach(flag ${msvc_flags})
16 if ("${flag}" MATCHES "^-[DU]")
17 # Pass through basic command line macro definitions (-DNDEBUG).
18 list(APPEND clang_flags "${flag}")
19 elseif ("${flag}" MATCHES "^-O[2x]")
20 # Canonicalize normal optimization flags to -O2.
21 list(APPEND clang_flags "-O2")
24 set(${out_flags} "${clang_flags}" PARENT_SCOPE)
27 # Compile a sanitizer test with a freshly built clang
28 # for a given architecture, adding the result to the object list.
29 # - obj_list: output list of objects, populated by path
30 # of a generated object file.
31 # - source: source file of a test.
32 # - arch: architecture to compile for.
33 # sanitizer_test_compile(<obj_list> <source> <arch>
34 # KIND <custom namespace>
35 # COMPILE_DEPS <list of compile-time dependencies>
36 # DEPS <list of dependencies>
37 # CFLAGS <list of flags>
39 function(sanitizer_test_compile obj_list source arch)
40 cmake_parse_arguments(TEST
41 "" "" "KIND;COMPILE_DEPS;DEPS;CFLAGS" ${ARGN})
42 get_filename_component(basename ${source} NAME)
44 "${CMAKE_CFG_RESOLVED_INTDIR}${obj_list}.${basename}.${arch}${TEST_KIND}.o")
46 # Write out architecture-specific flags into TARGET_CFLAGS variable.
47 get_target_flags_for_arch(${arch} TARGET_CFLAGS)
48 set(COMPILE_DEPS ${TEST_COMPILE_DEPS})
49 if(NOT COMPILER_RT_STANDALONE_BUILD)
50 list(APPEND COMPILE_DEPS ${TEST_DEPS})
52 clang_compile(${output_obj} ${source}
53 CFLAGS ${TEST_CFLAGS} ${TARGET_CFLAGS}
55 list(APPEND ${obj_list} ${output_obj})
56 set("${obj_list}" "${${obj_list}}" PARENT_SCOPE)
59 # Compile a source into an object file with COMPILER_RT_TEST_COMPILER using
60 # a provided compile flags and dependenices.
61 # clang_compile(<object> <source>
62 # CFLAGS <list of compile flags>
63 # DEPS <list of dependencies>)
64 function(clang_compile object_file source)
65 cmake_parse_arguments(SOURCE "" "" "CFLAGS;DEPS" ${ARGN})
66 get_filename_component(source_rpath ${source} REALPATH)
67 if(NOT COMPILER_RT_STANDALONE_BUILD)
68 list(APPEND SOURCE_DEPS clang compiler-rt-headers)
70 if (TARGET CompilerRTUnitTestCheckCxx)
71 list(APPEND SOURCE_DEPS CompilerRTUnitTestCheckCxx)
73 if(COMPILER_RT_STANDALONE_BUILD)
74 # Only add global flags in standalone build.
75 string(REGEX MATCH "[.](cc|cpp)$" is_cxx ${source_rpath})
77 string(REPLACE " " ";" global_flags "${CMAKE_CXX_FLAGS}")
79 string(REPLACE " " ";" global_flags "${CMAKE_C_FLAGS}")
83 translate_msvc_cflags(global_flags "${global_flags}")
87 set(global_flags ${OSX_SYSROOT_FLAG} ${global_flags})
90 # Ignore unknown warnings. CMAKE_CXX_FLAGS may contain GCC-specific options
91 # which are not supported by Clang.
92 list(APPEND global_flags -Wno-unknown-warning-option)
93 set(compile_flags ${global_flags} ${SOURCE_CFLAGS})
95 set(compile_flags ${SOURCE_CFLAGS})
98 string(REGEX MATCH "[.](m|mm)$" is_objc ${source_rpath})
100 list(APPEND compile_flags "-ObjC")
104 OUTPUT ${object_file}
105 COMMAND ${COMPILER_RT_TEST_COMPILER} ${compile_flags} -c
108 MAIN_DEPENDENCY ${source}
109 DEPENDS ${SOURCE_DEPS}
110 COMMAND_EXPAND_LISTS)
113 # On Darwin, there are no system-wide C++ headers and the just-built clang is
114 # therefore not able to compile C++ files unless they are copied/symlinked into
115 # ${LLVM_BINARY_DIR}/include/c++
116 # The just-built clang is used to build compiler-rt unit tests. Let's detect
117 # this before we try to build the tests and print out a suggestion how to fix
119 # On other platforms, this is currently not an issue.
120 macro(clang_compiler_add_cxx_check)
123 "echo '#include <iostream>' | ${COMPILER_RT_TEST_COMPILER} ${OSX_SYSROOT_FLAG} -E -x c++ - > /dev/null"
126 " echo 'Your just-built clang cannot find C++ headers, which are needed to build and run compiler-rt tests.'"
127 " echo 'You should copy or symlink your system C++ headers into ${LLVM_BINARY_DIR}/include/c++'"
128 " if [ -d $(dirname $(dirname $(xcrun -f clang)))/include/c++ ]"
129 " then echo 'e.g. with:'"
130 " echo ' cp -r' $(dirname $(dirname $(xcrun -f clang)))/include/c++ '${LLVM_BINARY_DIR}/include/'"
131 " elif [ -d $(dirname $(dirname $(xcrun -f clang)))/lib/c++ ]"
132 " then echo 'e.g. with:'"
133 " echo ' cp -r' $(dirname $(dirname $(xcrun -f clang)))/lib/c++ '${LLVM_BINARY_DIR}/include/'"
135 " echo 'This can also be fixed by checking out the libcxx project from llvm.org and installing the headers'"
136 " echo 'into your build directory:'"
137 " echo ' cd ${LLVM_MAIN_SRC_DIR}/projects && svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx'"
138 " echo ' cd ${LLVM_BINARY_DIR} && make -C ${LLVM_MAIN_SRC_DIR}/projects/libcxx installheaders HEADER_DIR=${LLVM_BINARY_DIR}/include'"
143 add_custom_target(CompilerRTUnitTestCheckCxx
144 COMMAND bash -c "${CMD}"
145 COMMENT "Checking that just-built clang can find C++ headers..."
147 if (NOT COMPILER_RT_STANDALONE_BUILD AND NOT LLVM_RUNTIMES_BUILD)
148 ADD_DEPENDENCIES(CompilerRTUnitTestCheckCxx clang)