| # 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) |
| 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 ${source} REALPATH) |
| if(NOT COMPILER_RT_STANDALONE_BUILD) |
| list(APPEND SOURCE_DEPS clang compiler-rt-headers) |
| endif() |
| if (TARGET CompilerRTUnitTestCheckCxx) |
| list(APPEND SOURCE_DEPS CompilerRTUnitTestCheckCxx) |
| endif() |
| string(REGEX MATCH "[.](cc|cpp)$" is_cxx ${source_rpath}) |
| string(REGEX MATCH "[.](m|mm)$" is_objc ${source_rpath}) |
| if(is_cxx) |
| string(REPLACE " " ";" global_flags "${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() |
| if (is_objc) |
| list(APPEND global_flags -ObjC) |
| 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}) |
| 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) |
| ADD_DEPENDENCIES(CompilerRTUnitTestCheckCxx clang) |
| endif() |
| endif() |
| endmacro() |