# On Windows, CMAKE_*_FLAGS are built for MSVC but we use the GCC clang.exe,
# which uses completely different flags. Translate some common flag types, and
# drop the rest.
function(translate_msvc_cflags out_flags msvc_flags)
# Insert an empty string in the list to simplify processing.
set(msvc_flags ";${msvc_flags}")
# Canonicalize /flag to -flag.
string(REPLACE ";/" ";-" msvc_flags "${msvc_flags}")
# Make space separated -D and -U flags into joined flags.
string(REGEX REPLACE ";-\([DU]\);" ";-\\1" msvc_flags "${msvc_flags}")
set(clang_flags "")
foreach(flag ${msvc_flags})
if ("${flag}" MATCHES "^-[DU]")
# Pass through basic command line macro definitions (-DNDEBUG).
list(APPEND clang_flags "${flag}")
elseif ("${flag}" MATCHES "^-O[2x]")
# Canonicalize normal optimization flags to -O2.
list(APPEND clang_flags "-O2")
endif()
endforeach()
set(${out_flags} "${clang_flags}" PARENT_SCOPE)
endfunction()
# Compile a sanitizer test with a freshly built clang
# for a given architecture, adding the result to the object list.
# - obj_list: output list of objects, populated by path
# of a generated object file.
# - source: source file of a test.
# - arch: architecture to compile for.
# sanitizer_test_compile(<obj_list> <source> <arch>
# KIND <custom namespace>
# COMPILE_DEPS <list of compile-time dependencies>
# DEPS <list of dependencies>
# CFLAGS <list of flags>
# )
function(sanitizer_test_compile obj_list source arch)
cmake_parse_arguments(TEST
"" "" "KIND;COMPILE_DEPS;DEPS;CFLAGS" ${ARGN})
get_filename_component(basename ${source} NAME)
set(output_obj
"${CMAKE_CFG_RESOLVED_INTDIR}${obj_list}.${basename}.${arch}${TEST_KIND}.o")
# Write out architecture-specific flags into TARGET_CFLAGS variable.
get_target_flags_for_arch(${arch} TARGET_CFLAGS)
set(COMPILE_DEPS ${TEST_COMPILE_DEPS})
if(NOT COMPILER_RT_STANDALONE_BUILD OR COMPILER_RT_TEST_STANDALONE_BUILD_LIBS)
list(APPEND COMPILE_DEPS ${TEST_DEPS})
endif()
clang_compile(${output_obj} ${source}
CFLAGS ${TEST_CFLAGS} ${TARGET_CFLAGS}
DEPS ${COMPILE_DEPS})
list(APPEND ${obj_list} ${output_obj})
set("${obj_list}" "${${obj_list}}" PARENT_SCOPE)
endfunction()
# 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>)
function(clang_compile object_file source)
cmake_parse_arguments(SOURCE "" "" "CFLAGS;DEPS" ${ARGN})
get_filename_component(source_rpath ${source} REALPATH)
if(NOT COMPILER_RT_STANDALONE_BUILD)
list(APPEND SOURCE_DEPS clang)
endif()
list(APPEND SOURCE_DEPS compiler-rt-headers)
if (TARGET CompilerRTUnitTestCheckCxx)
list(APPEND SOURCE_DEPS CompilerRTUnitTestCheckCxx)
endif()
string(REGEX MATCH "[.](cc|cpp)$" is_cxx ${source_rpath})
if (is_cxx)
set(compiler ${COMPILER_RT_TEST_COMPILER})
else()
set(compiler ${COMPILER_RT_TEST_CXX_COMPILER})
endif()
if(COMPILER_RT_STANDALONE_BUILD)
# Only add global flags in standalone build.
if(is_cxx)
string(REPLACE " " ";" global_flags "${CMAKE_CXX_FLAGS}")
else()
string(REPLACE " " ";" global_flags "${CMAKE_C_FLAGS}")
endif()
if (MSVC)
translate_msvc_cflags(global_flags "${global_flags}")
endif()
if (APPLE)
set(global_flags ${OSX_SYSROOT_FLAG} ${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})
else()
set(compile_flags ${SOURCE_CFLAGS})
endif()
string(REGEX MATCH "[.](m|mm)$" is_objc ${source_rpath})
if (is_objc)
list(APPEND compile_flags "-ObjC")
endif()
add_custom_command(
OUTPUT ${object_file}
COMMAND ${compiler} ${compile_flags} -c
-o "${object_file}"
${source_rpath}
MAIN_DEPENDENCY ${source}
DEPENDS ${SOURCE_DEPS}
COMMAND_EXPAND_LISTS)
endfunction()
# 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} ${OSX_SYSROOT_FLAG} -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_MAIN_SRC_DIR}/projects && svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx'"
" echo ' cd ${LLVM_BINARY_DIR} && make -C ${LLVM_MAIN_SRC_DIR}/projects/libcxx installheaders HEADER_DIR=${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 (NOT COMPILER_RT_STANDALONE_BUILD AND NOT LLVM_RUNTIMES_BUILD)
ADD_DEPENDENCIES(CompilerRTUnitTestCheckCxx clang)
endif()
endif()
endmacro()
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