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include(LLVMParseArguments)
# 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>
# DEPS <list of dependencies>)
macro(clang_compile object_file source)
parse_arguments(SOURCE "CFLAGS;DEPS" "" ${ARGN})
get_filename_component(source_rpath ${source} REALPATH)
if(NOT COMPILER_RT_STANDALONE_BUILD)
list(APPEND SOURCE_DEPS clang compiler-rt-headers)
endif()
if (TARGET CompilerRTUnitTestCheckCxx)
list(APPEND SOURCE_DEPS CompilerRTUnitTestCheckCxx)
endif()
string(REGEX MATCH "[.](cc|cpp)$" 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 ${COMPILER_RT_TEST_COMPILER} ${compile_flags} -c
-o "${object_file}"
${source_rpath}
MAIN_DEPENDENCY ${source}
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()
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