diff options
Diffstat (limited to 'cmake')
| -rw-r--r-- | cmake/Modules/HandleCompilerRT.cmake | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/cmake/Modules/HandleCompilerRT.cmake b/cmake/Modules/HandleCompilerRT.cmake new file mode 100644 index 0000000..226b93e --- /dev/null +++ b/cmake/Modules/HandleCompilerRT.cmake @@ -0,0 +1,101 @@ +# Check if compile-rt library file path exists. +# If found, cache the path in: +# COMPILER_RT_LIBRARY-<name>-<target> +# If err_flag is true OR path not found, emit a message and set: +# COMPILER_RT_LIBRARY-<name>-<target> to NOTFOUND +function(cache_compiler_rt_library err_flag name target library_file) + if(err_flag OR NOT EXISTS "${library_file}") + message(STATUS "Failed to find compiler-rt ${name} library for ${target}") + set(COMPILER_RT_LIBRARY_${name}_${target} "NOTFOUND" CACHE INTERNAL + "compiler-rt ${name} library for ${target}") + else() + message(STATUS "Found compiler-rt ${name} library: ${library_file}") + set(COMPILER_RT_LIBRARY_${name}_${target} "${library_file}" CACHE INTERNAL + "compiler-rt ${name} library for ${target}") + endif() +endfunction() + +function(get_component_name name variable) + if(APPLE) + if(NOT name MATCHES "builtins.*") + set(component_name "${name}_") + endif() + # TODO: Support ios, tvos and watchos as well. + set(component_name "${component_name}osx") + else() + set(component_name "${name}") + endif() + set(${variable} "${component_name}" PARENT_SCOPE) +endfunction() + +# Find the path to compiler-rt library `name` (e.g. "builtins") for the +# specified `TARGET` (e.g. "x86_64-linux-gnu") and return it in `variable`. +# This calls cache_compiler_rt_library that caches the path to speed up +# repeated invocations with the same `name` and `target`. +function(find_compiler_rt_library name variable) + cmake_parse_arguments(ARG "" "TARGET;FLAGS" "" ${ARGN}) + # While we can use compiler-rt runtimes with other compilers, we need to + # query the compiler for runtime location and thus we require Clang. + if(NOT CMAKE_CXX_COMPILER_ID MATCHES Clang) + set(${variable} "NOTFOUND" PARENT_SCOPE) + return() + endif() + set(target "${ARG_TARGET}") + if(NOT target AND CMAKE_CXX_COMPILER_TARGET) + set(target "${CMAKE_CXX_COMPILER_TARGET}") + endif() + if(NOT DEFINED COMPILER_RT_LIBRARY_builtins_${target}) + # If the cache variable is not defined, invoke Clang and then + # set it with cache_compiler_rt_library. + set(clang_command ${CMAKE_CXX_COMPILER} "${ARG_FLAGS}") + if(target) + list(APPEND clang_command "--target=${target}") + endif() + get_property(cxx_flags CACHE CMAKE_CXX_FLAGS PROPERTY VALUE) + string(REPLACE " " ";" cxx_flags "${cxx_flags}") + list(APPEND clang_command ${cxx_flags}) + execute_process( + COMMAND ${clang_command} "--rtlib=compiler-rt" "-print-libgcc-file-name" + RESULT_VARIABLE had_error + OUTPUT_VARIABLE library_file + ) + string(STRIP "${library_file}" library_file) + file(TO_CMAKE_PATH "${library_file}" library_file) + get_filename_component(dirname ${library_file} DIRECTORY) + if(APPLE) + execute_process( + COMMAND ${clang_command} "--print-resource-dir" + RESULT_VARIABLE had_error + OUTPUT_VARIABLE resource_dir + ) + string(STRIP "${resource_dir}" resource_dir) + set(dirname "${resource_dir}/lib/darwin") + endif() + get_filename_component(basename ${library_file} NAME) + if(basename MATCHES "libclang_rt\.([a-z0-9_\-]+)\.a") + set(from_name ${CMAKE_MATCH_1}) + get_component_name(${CMAKE_MATCH_1} to_name) + string(REPLACE "${from_name}" "${to_name}" basename "${basename}") + set(library_file "${dirname}/${basename}") + cache_compiler_rt_library(${had_error} builtins "${target}" "${library_file}") + endif() + endif() + if(NOT COMPILER_RT_LIBRARY_builtins_${target}) + set(${variable} "NOTFOUND" PARENT_SCOPE) + return() + endif() + if(NOT DEFINED COMPILER_RT_LIBRARY_${name}_${target}) + # Clang gives only the builtins library path. Other library paths are + # obtained by substituting "builtins" with ${name} in the builtins + # path and then checking if the resultant path exists. The result of + # this check is also cached by cache_compiler_rt_library. + set(library_file "${COMPILER_RT_LIBRARY_builtins_${target}}") + if(library_file MATCHES ".*libclang_rt\.([a-z0-9_\-]+)\.a") + set(from_name ${CMAKE_MATCH_0}) + get_component_name(${name} to_name) + string(REPLACE "${from_name}" "${to_name}" library_file "${library_file}") + cache_compiler_rt_library(FALSE "${name}" "${target}" "${library_file}") + endif() + endif() + set(${variable} "${COMPILER_RT_LIBRARY_${name}_${target}}" PARENT_SCOPE) +endfunction() |