forked from OSchip/llvm-project
115 lines
4.2 KiB
CMake
115 lines
4.2 KiB
CMake
add_compiler_rt_component(crt)
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function(check_cxx_section_exists section output)
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cmake_parse_arguments(ARG "" "" "SOURCE;FLAGS" ${ARGN})
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if(NOT ARG_SOURCE)
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set(ARG_SOURCE "int main() { return 0; }\n")
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endif()
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string(RANDOM TARGET_NAME)
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set(TARGET_NAME "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/cmTC_${TARGET_NAME}.dir")
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file(MAKE_DIRECTORY ${TARGET_NAME})
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file(WRITE "${TARGET_NAME}/CheckSectionExists.c" "${ARG_SOURCE}\n")
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string(REGEX MATCHALL "<[A-Za-z0-9_]*>" substitutions
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${CMAKE_C_COMPILE_OBJECT})
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set(try_compile_flags "${ARG_FLAGS}")
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if(CMAKE_C_COMPILER_ID MATCHES Clang AND CMAKE_C_COMPILER_TARGET)
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list(APPEND try_compile_flags "-target ${CMAKE_C_COMPILER_TARGET}")
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endif()
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append_list_if(COMPILER_RT_HAS_FNO_LTO_FLAG -fno-lto try_compile_flags)
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if(NOT COMPILER_RT_ENABLE_PGO)
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if(LLVM_PROFDATA_FILE AND COMPILER_RT_HAS_FNO_PROFILE_INSTR_USE_FLAG)
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list(APPEND try_compile_flags "-fno-profile-instr-use")
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endif()
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if(LLVM_BUILD_INSTRUMENTED MATCHES IR AND COMPILER_RT_HAS_FNO_PROFILE_GENERATE_FLAG)
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list(APPEND try_compile_flags "-fno-profile-generate")
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elseif(LLVM_BUILD_INSTRUMENTED AND COMPILER_RT_HAS_FNO_PROFILE_INSTR_GENERATE_FLAG)
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list(APPEND try_compile_flags "-fno-profile-instr-generate")
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endif()
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endif()
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string(REPLACE ";" " " extra_flags "${try_compile_flags}")
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set(test_compile_command "${CMAKE_C_COMPILE_OBJECT}")
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foreach(substitution ${substitutions})
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if(substitution STREQUAL "<CMAKE_C_COMPILER>")
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string(REPLACE "<CMAKE_C_COMPILER>" "${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_ARG1}"
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test_compile_command ${test_compile_command})
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elseif(substitution STREQUAL "<OBJECT>")
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string(REPLACE "<OBJECT>" "${TARGET_NAME}/CheckSectionExists.o"
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test_compile_command ${test_compile_command})
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elseif(substitution STREQUAL "<SOURCE>")
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string(REPLACE "<SOURCE>" "${TARGET_NAME}/CheckSectionExists.c"
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test_compile_command ${test_compile_command})
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elseif(substitution STREQUAL "<FLAGS>")
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string(REPLACE "<FLAGS>" "${CMAKE_C_FLAGS} ${extra_flags}"
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test_compile_command ${test_compile_command})
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else()
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string(REPLACE "${substitution}" "" test_compile_command
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${test_compile_command})
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endif()
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endforeach()
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# Strip quotes from the compile command, as the compiler is not expecting
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# quoted arguments (potential quotes added from D62063).
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string(REPLACE "\"" "" test_compile_command "${test_compile_command}")
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string(REPLACE " " ";" test_compile_command "${test_compile_command}")
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execute_process(
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COMMAND ${test_compile_command}
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RESULT_VARIABLE TEST_RESULT
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OUTPUT_VARIABLE TEST_OUTPUT
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ERROR_VARIABLE TEST_ERROR
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)
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# Explicitly throw a fatal error message if test_compile_command fails.
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if(TEST_RESULT)
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message(FATAL_ERROR "${TEST_ERROR}")
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return()
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endif()
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execute_process(
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COMMAND ${CMAKE_OBJDUMP} -h "${TARGET_NAME}/CheckSectionExists.o"
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RESULT_VARIABLE CHECK_RESULT
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OUTPUT_VARIABLE CHECK_OUTPUT
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ERROR_VARIABLE CHECK_ERROR
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)
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string(FIND "${CHECK_OUTPUT}" "${section}" SECTION_FOUND)
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if(NOT SECTION_FOUND EQUAL -1)
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set(${output} TRUE PARENT_SCOPE)
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else()
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set(${output} FALSE PARENT_SCOPE)
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endif()
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file(REMOVE_RECURSE ${TARGET_NAME})
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endfunction()
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check_cxx_section_exists(".init_array" COMPILER_RT_HAS_INITFINI_ARRAY
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SOURCE "volatile int x;\n__attribute__((constructor)) void f() {x = 0;}\nint main() { return 0; }\n")
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append_list_if(COMPILER_RT_HAS_STD_C11_FLAG -std=c11 CRT_CFLAGS)
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append_list_if(COMPILER_RT_HAS_INITFINI_ARRAY -DCRT_HAS_INITFINI_ARRAY CRT_CFLAGS)
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append_list_if(COMPILER_RT_CRT_USE_EH_FRAME_REGISTRY -DEH_USE_FRAME_REGISTRY CRT_CFLAGS)
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append_list_if(COMPILER_RT_HAS_FPIC_FLAG -fPIC CRT_CFLAGS)
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append_list_if(COMPILER_RT_HAS_WNO_PEDANTIC -Wno-pedantic CRT_CFLAGS)
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foreach(arch ${CRT_SUPPORTED_ARCH})
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add_compiler_rt_runtime(clang_rt.crtbegin
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OBJECT
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ARCHS ${arch}
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SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/crtbegin.c
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CFLAGS ${CRT_CFLAGS}
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PARENT_TARGET crt)
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add_compiler_rt_runtime(clang_rt.crtend
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OBJECT
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ARCHS ${arch}
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SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/crtend.c
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CFLAGS ${CRT_CFLAGS}
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PARENT_TARGET crt)
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endforeach()
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