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add_compiler_rt_component(crt)
function(check_cxx_section_exists section output)
cmake_parse_arguments(ARG "" "" "SOURCE;FLAGS" ${ARGN})
if(NOT ARG_SOURCE)
set(ARG_SOURCE "int main() { return 0; }\n")
endif()
string(RANDOM TARGET_NAME)
set(TARGET_NAME "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/cmTC_${TARGET_NAME}.dir")
file(MAKE_DIRECTORY ${TARGET_NAME})
file(WRITE "${TARGET_NAME}/CheckSectionExists.c" "${ARG_SOURCE}\n")
string(REGEX MATCHALL "<[A-Za-z0-9_]*>" substitutions
${CMAKE_C_COMPILE_OBJECT})
set(try_compile_flags "${ARG_FLAGS}")
if(CMAKE_C_COMPILER_ID MATCHES Clang AND CMAKE_C_COMPILER_TARGET)
list(APPEND try_compile_flags "-target ${CMAKE_C_COMPILER_TARGET}")
endif()
append_list_if(COMPILER_RT_HAS_FNO_LTO_FLAG -fno-lto try_compile_flags)
string(REPLACE ";" " " extra_flags "${try_compile_flags}")
set(test_compile_command "${CMAKE_C_COMPILE_OBJECT}")
foreach(substitution ${substitutions})
if(substitution STREQUAL "<CMAKE_C_COMPILER>")
string(REPLACE "<CMAKE_C_COMPILER>" "${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_ARG1}"
test_compile_command ${test_compile_command})
elseif(substitution STREQUAL "<OBJECT>")
string(REPLACE "<OBJECT>" "${TARGET_NAME}/CheckSectionExists.o"
test_compile_command ${test_compile_command})
elseif(substitution STREQUAL "<SOURCE>")
string(REPLACE "<SOURCE>" "${TARGET_NAME}/CheckSectionExists.c"
test_compile_command ${test_compile_command})
elseif(substitution STREQUAL "<FLAGS>")
string(REPLACE "<FLAGS>" "${CMAKE_C_FLAGS} ${extra_flags}"
test_compile_command ${test_compile_command})
else()
string(REPLACE "${substitution}" "" test_compile_command
${test_compile_command})
endif()
endforeach()
string(REPLACE " " ";" test_compile_command "${test_compile_command}")
execute_process(
COMMAND ${test_compile_command}
RESULT_VARIABLE TEST_RESULT
OUTPUT_VARIABLE TEST_OUTPUT
ERROR_VARIABLE TEST_ERROR
)
execute_process(
COMMAND ${CMAKE_OBJDUMP} -h "${TARGET_NAME}/CheckSectionExists.o"
RESULT_VARIABLE CHECK_RESULT
OUTPUT_VARIABLE CHECK_OUTPUT
ERROR_VARIABLE CHECK_ERROR
)
string(FIND "${CHECK_OUTPUT}" "${section}" SECTION_FOUND)
if(NOT SECTION_FOUND EQUAL -1)
set(${output} TRUE PARENT_SCOPE)
else()
set(${output} FALSE PARENT_SCOPE)
endif()
file(REMOVE_RECURSE ${TARGET_NAME})
endfunction()
check_cxx_section_exists(".init_array" COMPILER_RT_HAS_INITFINI_ARRAY
SOURCE "volatile int x;\n__attribute__((constructor)) void f() {x = 0;}\nint main() { return 0; }\n")
append_list_if(COMPILER_RT_HAS_STD_C11_FLAG -std=c11 CRT_CFLAGS)
append_list_if(COMPILER_RT_HAS_INITFINI_ARRAY -DCRT_HAS_INITFINI_ARRAY CRT_CFLAGS)
append_list_if(COMPILER_RT_CRT_USE_EH_FRAME_REGISTRY -DEH_USE_FRAME_REGISTRY CRT_CFLAGS)
append_list_if(COMPILER_RT_HAS_FPIC_FLAG -fPIC CRT_CFLAGS)
append_list_if(COMPILER_RT_HAS_WNO_PEDANTIC -Wno-pedantic CRT_CFLAGS)
foreach(arch ${CRT_SUPPORTED_ARCH})
add_compiler_rt_runtime(clang_rt.crtbegin
OBJECT
ARCHS ${arch}
SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/crtbegin.c
CFLAGS ${CRT_CFLAGS}
PARENT_TARGET crt)
add_compiler_rt_runtime(clang_rt.crtend
OBJECT
ARCHS ${arch}
SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/crtend.c
CFLAGS ${CRT_CFLAGS}
PARENT_TARGET crt)
endforeach()
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