diff options
Diffstat (limited to 'cmake/Modules/CompilerRTCompile.cmake')
| -rw-r--r-- | cmake/Modules/CompilerRTCompile.cmake | 71 |
1 files changed, 68 insertions, 3 deletions
diff --git a/cmake/Modules/CompilerRTCompile.cmake b/cmake/Modules/CompilerRTCompile.cmake index 2794cabe59c57..af3df8ff4f44b 100644 --- a/cmake/Modules/CompilerRTCompile.cmake +++ b/cmake/Modules/CompilerRTCompile.cmake @@ -1,6 +1,6 @@ include(LLVMParseArguments) -# Compile a source into an object file with just-built Clang using +# Compile a source into an object file with COMPILER_RT_TEST_COMPILER using # a provided compile flags and dependenices. # clang_compile(<object> <source> # CFLAGS <list of compile flags> @@ -8,9 +8,74 @@ include(LLVMParseArguments) macro(clang_compile object_file source) parse_arguments(SOURCE "CFLAGS;DEPS" "" ${ARGN}) get_filename_component(source_rpath ${source} REALPATH) + if(NOT COMPILER_RT_STANDALONE_BUILD) + list(APPEND SOURCE_DEPS clang) + endif() + if (TARGET CompilerRTUnitTestCheckCxx) + list(APPEND SOURCE_DEPS CompilerRTUnitTestCheckCxx) + endif() + string(REGEX MATCH "[.](cc|cpp)$" is_cxx ${source_rpath}) + if(is_cxx) + string(REPLACE " " ";" global_flags "${CMAKE_CXX_FLAGS}") + else() + string(REPLACE " " ";" global_flags "${CMAKE_C_FLAGS}") + endif() + # On Windows, CMAKE_*_FLAGS are built for MSVC but we use the GCC clang.exe + # which doesn't support flags starting with "/smth". Replace those with + # "-smth" equivalents. + if(MSVC) + string(REGEX REPLACE "^/" "-" global_flags "${global_flags}") + string(REPLACE ";/" ";-" global_flags "${global_flags}") + endif() + # Ignore unknown warnings. CMAKE_CXX_FLAGS may contain GCC-specific options + # which are not supported by Clang. + list(APPEND global_flags -Wno-unknown-warning-option) + set(compile_flags ${global_flags} ${SOURCE_CFLAGS}) add_custom_command( OUTPUT ${object_file} - COMMAND clang ${SOURCE_CFLAGS} -c -o "${object_file}" ${source_rpath} + COMMAND ${COMPILER_RT_TEST_COMPILER} ${compile_flags} -c + -o "${object_file}" + ${source_rpath} MAIN_DEPENDENCY ${source} - DEPENDS clang ${SOURCE_DEPS}) + DEPENDS ${SOURCE_DEPS}) +endmacro() + +# On Darwin, there are no system-wide C++ headers and the just-built clang is +# therefore not able to compile C++ files unless they are copied/symlinked into +# ${LLVM_BINARY_DIR}/include/c++ +# The just-built clang is used to build compiler-rt unit tests. Let's detect +# this before we try to build the tests and print out a suggestion how to fix +# it. +# On other platforms, this is currently not an issue. +macro(clang_compiler_add_cxx_check) + if (APPLE) + set(CMD + "echo '#include <iostream>' | ${COMPILER_RT_TEST_COMPILER} -E -x c++ - > /dev/null" + "if [ $? != 0 ] " + " then echo" + " echo 'Your just-built clang cannot find C++ headers, which are needed to build and run compiler-rt tests.'" + " echo 'You should copy or symlink your system C++ headers into ${LLVM_BINARY_DIR}/include/c++'" + " if [ -d $(dirname $(dirname $(xcrun -f clang)))/include/c++ ]" + " then echo 'e.g. with:'" + " echo ' cp -r' $(dirname $(dirname $(xcrun -f clang)))/include/c++ '${LLVM_BINARY_DIR}/include/'" + " elif [ -d $(dirname $(dirname $(xcrun -f clang)))/lib/c++ ]" + " then echo 'e.g. with:'" + " echo ' cp -r' $(dirname $(dirname $(xcrun -f clang)))/lib/c++ '${LLVM_BINARY_DIR}/include/'" + " fi" + " echo 'This can also be fixed by checking out the libcxx project from llvm.org and installing the headers'" + " echo 'into your build directory:'" + " echo ' cd ${LLVM_SOURCE_DIR}/projects && svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx'" + " echo ' cd ${LLVM_BINARY_DIR} && make -C ${LLVM_SOURCE_DIR}/projects/libcxx installheaders HEADER_DIR=${LLVM_BINARY_DIR}/include'" + " echo" + " false" + "fi" + ) + add_custom_target(CompilerRTUnitTestCheckCxx + COMMAND bash -c "${CMD}" + COMMENT "Checking that just-built clang can find C++ headers..." + VERBATIM) + if (TARGET clang) + ADD_DEPENDENCIES(CompilerRTUnitTestCheckCxx clang) + endif() + endif() endmacro() |