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# 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 ${target}")
endif()
endfunction()
# Find the path to compiler-rt library `name` (e.g. "builtins") for
# the specified `target` (e.g. "x86_64-linux") and return it in `variable`.
# This calls cache_compiler_rt_library that caches the path to speed up
# repeated invocations with the same `name` and `target`.
function(find_compiler_rt_library name target variable)
if(NOT CMAKE_CXX_COMPILER_ID MATCHES Clang)
set(${variable} "NOTFOUND" PARENT_SCOPE)
return()
endif()
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} ${SANITIZER_COMMON_FLAGS}
"--rtlib=compiler-rt" "-print-libgcc-file-name")
if(target)
list(APPEND CLANG_COMMAND "--target=${target}")
endif()
get_property(SANITIZER_CXX_FLAGS CACHE CMAKE_CXX_FLAGS PROPERTY VALUE)
string(REPLACE " " ";" SANITIZER_CXX_FLAGS "${SANITIZER_CXX_FLAGS}")
list(APPEND CLANG_COMMAND ${SANITIZER_CXX_FLAGS})
execute_process(
COMMAND ${CLANG_COMMAND}
RESULT_VARIABLE HAD_ERROR
OUTPUT_VARIABLE LIBRARY_FILE
)
string(STRIP "${LIBRARY_FILE}" LIBRARY_FILE)
file(TO_CMAKE_PATH "${LIBRARY_FILE}" LIBRARY_FILE)
cache_compiler_rt_library(${HAD_ERROR}
builtins "${target}" "${LIBRARY_FILE}")
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-${target}}")
string(REPLACE "builtins" "${name}" LIBRARY_FILE "${LIBRARY_FILE}")
cache_compiler_rt_library(FALSE "${name}" "${target}" "${LIBRARY_FILE}")
endif()
set(${variable} "${COMPILER_RT_LIBRARY-${name}-${target}}" PARENT_SCOPE)
endfunction()
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