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 3# 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 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> 38# ) 39function(sanitizer_test_compile obj_list source arch) 40 cmake_parse_arguments(TEST 41 "" "" "KIND;COMPILE_DEPS;DEPS;CFLAGS" ${ARGN}) 42 get_filename_component(basename ${source} NAME) 43 set(output_obj 44 "${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) 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 using 60# 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 ${source} REALPATH) 67 if(NOT COMPILER_RT_STANDALONE_BUILD) 68 list(APPEND SOURCE_DEPS clang compiler-rt-headers) 69 endif() 70 if (TARGET CompilerRTUnitTestCheckCxx) 71 list(APPEND SOURCE_DEPS CompilerRTUnitTestCheckCxx) 72 endif() 73 if(COMPILER_RT_STANDALONE_BUILD) 74 # Only add global flags in standalone build. 75 string(REGEX MATCH "[.](cc|cpp)$" is_cxx ${source_rpath}) 76 if(is_cxx) 77 string(REPLACE " " ";" global_flags "${CMAKE_CXX_FLAGS}") 78 else() 79 string(REPLACE " " ";" global_flags "${CMAKE_C_FLAGS}") 80 endif() 81 82 if (MSVC) 83 translate_msvc_cflags(global_flags "${global_flags}") 84 endif() 85 86 if (APPLE) 87 set(global_flags ${OSX_SYSROOT_FLAG} ${global_flags}) 88 endif() 89 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}) 94 else() 95 set(compile_flags ${SOURCE_CFLAGS}) 96 endif() 97 98 string(REGEX MATCH "[.](m|mm)$" is_objc ${source_rpath}) 99 if (is_objc) 100 list(APPEND compile_flags "-ObjC") 101 endif() 102 103 add_custom_command( 104 OUTPUT ${object_file} 105 COMMAND ${COMPILER_RT_TEST_COMPILER} ${compile_flags} -c 106 -o "${object_file}" 107 ${source_rpath} 108 MAIN_DEPENDENCY ${source} 109 DEPENDS ${SOURCE_DEPS}) 110endfunction() 111 112# On Darwin, there are no system-wide C++ headers and the just-built clang is 113# therefore not able to compile C++ files unless they are copied/symlinked into 114# ${LLVM_BINARY_DIR}/include/c++ 115# The just-built clang is used to build compiler-rt unit tests. Let's detect 116# this before we try to build the tests and print out a suggestion how to fix 117# it. 118# On other platforms, this is currently not an issue. 119macro(clang_compiler_add_cxx_check) 120 if (APPLE) 121 set(CMD 122 "echo '#include <iostream>' | ${COMPILER_RT_TEST_COMPILER} ${OSX_SYSROOT_FLAG} -E -x c++ - > /dev/null" 123 "if [ $? != 0 ] " 124 " then echo" 125 " echo 'Your just-built clang cannot find C++ headers, which are needed to build and run compiler-rt tests.'" 126 " echo 'You should copy or symlink your system C++ headers into ${LLVM_BINARY_DIR}/include/c++'" 127 " if [ -d $(dirname $(dirname $(xcrun -f clang)))/include/c++ ]" 128 " then echo 'e.g. with:'" 129 " echo ' cp -r' $(dirname $(dirname $(xcrun -f clang)))/include/c++ '${LLVM_BINARY_DIR}/include/'" 130 " elif [ -d $(dirname $(dirname $(xcrun -f clang)))/lib/c++ ]" 131 " then echo 'e.g. with:'" 132 " echo ' cp -r' $(dirname $(dirname $(xcrun -f clang)))/lib/c++ '${LLVM_BINARY_DIR}/include/'" 133 " fi" 134 " echo 'This can also be fixed by checking out the libcxx project from llvm.org and installing the headers'" 135 " echo 'into your build directory:'" 136 " echo ' cd ${LLVM_MAIN_SRC_DIR}/projects && svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx'" 137 " echo ' cd ${LLVM_BINARY_DIR} && make -C ${LLVM_MAIN_SRC_DIR}/projects/libcxx installheaders HEADER_DIR=${LLVM_BINARY_DIR}/include'" 138 " echo" 139 " false" 140 "fi" 141 ) 142 add_custom_target(CompilerRTUnitTestCheckCxx 143 COMMAND bash -c "${CMD}" 144 COMMENT "Checking that just-built clang can find C++ headers..." 145 VERBATIM) 146 if (NOT COMPILER_RT_STANDALONE_BUILD AND NOT RUNTIMES_BUILD) 147 ADD_DEPENDENCIES(CompilerRTUnitTestCheckCxx clang) 148 endif() 149 endif() 150endmacro() 151