forked from OSchip/llvm-project
108 lines
4.4 KiB
CMake
108 lines
4.4 KiB
CMake
# On Windows, CMAKE_*_FLAGS are built for MSVC but we use the GCC clang.exe,
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# which uses completely different flags. Translate some common flag types, and
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# drop the rest.
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function(translate_msvc_cflags out_flags msvc_flags)
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# Insert an empty string in the list to simplify processing.
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set(msvc_flags ";${msvc_flags}")
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# Canonicalize /flag to -flag.
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string(REPLACE ";/" ";-" msvc_flags "${msvc_flags}")
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# Make space separated -D and -U flags into joined flags.
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string(REGEX REPLACE ";-\([DU]\);" ";-\\1" msvc_flags "${msvc_flags}")
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set(clang_flags "")
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foreach(flag ${msvc_flags})
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if ("${flag}" MATCHES "^-[DU]")
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# Pass through basic command line macro definitions (-DNDEBUG).
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list(APPEND clang_flags "${flag}")
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elseif ("${flag}" MATCHES "^-O[2x]")
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# Canonicalize normal optimization flags to -O2.
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list(APPEND clang_flags "-O2")
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endif()
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endforeach()
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set(${out_flags} "${clang_flags}" PARENT_SCOPE)
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endfunction()
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# Compile a source into an object file with COMPILER_RT_TEST_COMPILER using
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# a provided compile flags and dependenices.
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# clang_compile(<object> <source>
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# CFLAGS <list of compile flags>
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# DEPS <list of dependencies>)
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macro(clang_compile object_file source)
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cmake_parse_arguments(SOURCE "" "" "CFLAGS;DEPS" ${ARGN})
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get_filename_component(source_rpath ${source} REALPATH)
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if(NOT COMPILER_RT_STANDALONE_BUILD)
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list(APPEND SOURCE_DEPS clang compiler-rt-headers)
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endif()
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if (TARGET CompilerRTUnitTestCheckCxx)
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list(APPEND SOURCE_DEPS CompilerRTUnitTestCheckCxx)
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endif()
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string(REGEX MATCH "[.](cc|cpp)$" is_cxx ${source_rpath})
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if(is_cxx)
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string(REPLACE " " ";" global_flags "${CMAKE_CXX_FLAGS}")
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else()
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string(REPLACE " " ";" global_flags "${CMAKE_C_FLAGS}")
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endif()
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if (MSVC)
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translate_msvc_cflags(global_flags "${global_flags}")
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endif()
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if (APPLE)
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set(global_flags ${OSX_SYSROOT_FLAG} ${global_flags})
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endif()
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# Ignore unknown warnings. CMAKE_CXX_FLAGS may contain GCC-specific options
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# which are not supported by Clang.
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list(APPEND global_flags -Wno-unknown-warning-option)
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set(compile_flags ${global_flags} ${SOURCE_CFLAGS})
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add_custom_command(
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OUTPUT ${object_file}
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COMMAND ${COMPILER_RT_TEST_COMPILER} ${compile_flags} -c
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-o "${object_file}"
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${source_rpath}
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MAIN_DEPENDENCY ${source}
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DEPENDS ${SOURCE_DEPS})
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endmacro()
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# On Darwin, there are no system-wide C++ headers and the just-built clang is
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# therefore not able to compile C++ files unless they are copied/symlinked into
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# ${LLVM_BINARY_DIR}/include/c++
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# The just-built clang is used to build compiler-rt unit tests. Let's detect
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# this before we try to build the tests and print out a suggestion how to fix
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# it.
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# On other platforms, this is currently not an issue.
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macro(clang_compiler_add_cxx_check)
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if (APPLE)
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set(CMD
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"echo '#include <iostream>' | ${COMPILER_RT_TEST_COMPILER} ${OSX_SYSROOT_FLAG} -E -x c++ - > /dev/null"
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"if [ $? != 0 ] "
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" then echo"
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" echo 'Your just-built clang cannot find C++ headers, which are needed to build and run compiler-rt tests.'"
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" echo 'You should copy or symlink your system C++ headers into ${LLVM_BINARY_DIR}/include/c++'"
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" if [ -d $(dirname $(dirname $(xcrun -f clang)))/include/c++ ]"
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" then echo 'e.g. with:'"
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" echo ' cp -r' $(dirname $(dirname $(xcrun -f clang)))/include/c++ '${LLVM_BINARY_DIR}/include/'"
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" elif [ -d $(dirname $(dirname $(xcrun -f clang)))/lib/c++ ]"
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" then echo 'e.g. with:'"
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" echo ' cp -r' $(dirname $(dirname $(xcrun -f clang)))/lib/c++ '${LLVM_BINARY_DIR}/include/'"
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" fi"
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" echo 'This can also be fixed by checking out the libcxx project from llvm.org and installing the headers'"
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" echo 'into your build directory:'"
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" echo ' cd ${LLVM_MAIN_SRC_DIR}/projects && svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx'"
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" echo ' cd ${LLVM_BINARY_DIR} && make -C ${LLVM_MAIN_SRC_DIR}/projects/libcxx installheaders HEADER_DIR=${LLVM_BINARY_DIR}/include'"
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" echo"
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" false"
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"fi"
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)
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add_custom_target(CompilerRTUnitTestCheckCxx
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COMMAND bash -c "${CMD}"
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COMMENT "Checking that just-built clang can find C++ headers..."
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VERBATIM)
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if (TARGET clang)
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ADD_DEPENDENCIES(CompilerRTUnitTestCheckCxx clang)
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endif()
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endif()
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endmacro()
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