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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, and3# drop the rest.4function(translate_msvc_cflags out_flags msvc_flags)5 # Insert an empty string in the list to simplify processing.6 set(msvc_flags ";${msvc_flags}")7 8 # Canonicalize /flag to -flag.9 string(REPLACE ";/" ";-" msvc_flags "${msvc_flags}")10 11 # Make space separated -D and -U flags into joined flags.12 string(REGEX REPLACE ";-\([DU]\);" ";-\\1" msvc_flags "${msvc_flags}")13 14 set(clang_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")22 endif()23 endforeach()24 set(${out_flags} "${clang_flags}" PARENT_SCOPE)25endfunction()26 27# Compile a sanitizer test with a freshly built clang28# for a given architecture, adding the result to the object list.29# - obj_list: output list of objects, populated by path30# 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>38# )39function(sanitizer_test_compile obj_list source arch)40 cmake_parse_arguments(TEST41 "" "" "KIND;COMPILE_DEPS;DEPS;CFLAGS" ${ARGN})42 get_filename_component(basename ${source} NAME)43 set(output_obj44 "${CMAKE_CFG_RESOLVED_INTDIR}${obj_list}.${basename}.${arch}${TEST_KIND}.o")45 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 OR COMPILER_RT_TEST_STANDALONE_BUILD_LIBS)50 list(APPEND COMPILE_DEPS ${TEST_DEPS})51 endif()52 clang_compile(${output_obj} ${source}53 CFLAGS ${TEST_CFLAGS} ${TARGET_CFLAGS}54 DEPS ${COMPILE_DEPS})55 list(APPEND ${obj_list} ${output_obj})56 set("${obj_list}" "${${obj_list}}" PARENT_SCOPE)57endfunction()58 59# Compile a source into an object file with COMPILER_RT_TEST_COMPILER using60# a provided compile flags and dependenices.61# clang_compile(<object> <source>62# CFLAGS <list of compile flags>63# DEPS <list of dependencies>)64function(clang_compile object_file source)65 cmake_parse_arguments(SOURCE "" "" "CFLAGS;DEPS" ${ARGN})66 get_filename_component(source_rpath ${source} REALPATH)67 if(NOT COMPILER_RT_STANDALONE_BUILD)68 list(APPEND SOURCE_DEPS clang)69 endif()70 list(APPEND SOURCE_DEPS compiler-rt-headers)71 if (TARGET CompilerRTUnitTestCheckCxx)72 list(APPEND SOURCE_DEPS CompilerRTUnitTestCheckCxx)73 endif()74 string(REGEX MATCH "[.](cc|cpp)$" is_cxx ${source_rpath})75 if (is_cxx)76 set(compiler ${COMPILER_RT_TEST_CXX_COMPILER})77 else()78 set(compiler ${COMPILER_RT_TEST_COMPILER})79 endif()80 if(COMPILER_RT_STANDALONE_BUILD)81 # Only add global flags in standalone build.82 if(is_cxx)83 string(REPLACE " " ";" global_flags "${CMAKE_CXX_FLAGS}")84 else()85 string(REPLACE " " ";" global_flags "${CMAKE_C_FLAGS}")86 endif()87 88 if (MSVC)89 translate_msvc_cflags(global_flags "${global_flags}")90 endif()91 92 if (APPLE)93 set(global_flags ${OSX_SYSROOT_FLAG} ${global_flags})94 endif()95 96 # Ignore unknown warnings. CMAKE_CXX_FLAGS may contain GCC-specific options97 # which are not supported by Clang.98 list(APPEND global_flags -Wno-unknown-warning-option)99 set(compile_flags ${global_flags} ${SOURCE_CFLAGS})100 else()101 set(compile_flags ${SOURCE_CFLAGS})102 endif()103 104 string(REGEX MATCH "[.](m|mm)$" is_objc ${source_rpath})105 if (is_objc)106 list(APPEND compile_flags "-ObjC")107 endif()108 109 add_custom_command(110 OUTPUT ${object_file}111 COMMAND ${compiler} ${compile_flags} -c112 -o "${object_file}"113 ${source_rpath}114 MAIN_DEPENDENCY ${source}115 DEPENDS ${SOURCE_DEPS}116 COMMAND_EXPAND_LISTS)117endfunction()118 119# On Darwin, there are no system-wide C++ headers and the just-built clang is120# therefore not able to compile C++ files unless they are copied/symlinked into121# ${LLVM_BINARY_DIR}/include/c++122# The just-built clang is used to build compiler-rt unit tests. Let's detect123# this before we try to build the tests and print out a suggestion how to fix124# it.125# On other platforms, this is currently not an issue.126macro(clang_compiler_add_cxx_check)127 if (APPLE)128 set(CMD129 "echo '#include <iostream>' | ${COMPILER_RT_TEST_COMPILER} ${OSX_SYSROOT_FLAG} -E -x c++ - > /dev/null"130 "if [ $? != 0 ] "131 " then echo"132 " echo 'Your just-built clang cannot find C++ headers, which are needed to build and run compiler-rt tests.'"133 " echo 'You should copy or symlink your system C++ headers into ${LLVM_BINARY_DIR}/include/c++'"134 " if [ -d $(dirname $(dirname $(xcrun -f clang)))/include/c++ ]"135 " then echo 'e.g. with:'"136 " echo ' cp -r' $(dirname $(dirname $(xcrun -f clang)))/include/c++ '${LLVM_BINARY_DIR}/include/'"137 " elif [ -d $(dirname $(dirname $(xcrun -f clang)))/lib/c++ ]"138 " then echo 'e.g. with:'"139 " echo ' cp -r' $(dirname $(dirname $(xcrun -f clang)))/lib/c++ '${LLVM_BINARY_DIR}/include/'"140 " fi"141 " echo 'This can also be fixed by checking out the libcxx project from llvm.org and installing the headers'"142 " echo 'into your build directory:'"143 " echo ' cd ${LLVM_MAIN_SRC_DIR}/projects && svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx'"144 " echo ' cd ${LLVM_BINARY_DIR} && make -C ${LLVM_MAIN_SRC_DIR}/projects/libcxx installheaders HEADER_DIR=${LLVM_BINARY_DIR}/include'"145 " echo"146 " false"147 "fi"148 )149 add_custom_target(CompilerRTUnitTestCheckCxx150 COMMAND bash -c "${CMD}"151 COMMENT "Checking that just-built clang can find C++ headers..."152 VERBATIM)153 if (NOT COMPILER_RT_STANDALONE_BUILD AND NOT LLVM_RUNTIMES_BUILD)154 ADD_DEPENDENCIES(CompilerRTUnitTestCheckCxx clang)155 endif()156 endif()157endmacro()158