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# Check if the compiler-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})
set(cmd_prefix "")
if(MSVC AND ${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
set(cmd_prefix "/clang:")
endif()
execute_process(
COMMAND ${clang_command} "${cmd_prefix}--rtlib=compiler-rt" "${cmd_prefix}-print-libgcc-file-name"
RESULT_VARIABLE had_error
OUTPUT_VARIABLE library_file
)
string(STRIP "${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 ".*clang_rt\.([a-z0-9_\-]+)\.(a|lib)")
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 ".*clang_rt\.([a-z0-9_\-]+)\.(a|lib)")
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()
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