1add_compiler_rt_component(crt)
2
3function(check_cxx_section_exists section output)
4  cmake_parse_arguments(ARG "" "" "SOURCE;FLAGS" ${ARGN})
5  if(NOT ARG_SOURCE)
6    set(ARG_SOURCE "int main() { return 0; }\n")
7  endif()
8
9  string(RANDOM TARGET_NAME)
10  set(TARGET_NAME "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/cmTC_${TARGET_NAME}.dir")
11  file(MAKE_DIRECTORY ${TARGET_NAME})
12
13  file(WRITE "${TARGET_NAME}/CheckSectionExists.c" "${ARG_SOURCE}\n")
14
15  string(REGEX MATCHALL "<[A-Za-z0-9_]*>" substitutions
16         ${CMAKE_C_COMPILE_OBJECT})
17
18  set(try_compile_flags "${ARG_FLAGS}")
19  if(CMAKE_C_COMPILER_ID MATCHES Clang AND CMAKE_C_COMPILER_TARGET)
20    list(APPEND try_compile_flags "-target ${CMAKE_C_COMPILER_TARGET}")
21  endif()
22  append_list_if(COMPILER_RT_HAS_FNO_LTO_FLAG -fno-lto try_compile_flags)
23  if(NOT COMPILER_RT_ENABLE_PGO)
24    if(LLVM_PROFDATA_FILE AND COMPILER_RT_HAS_FNO_PROFILE_INSTR_USE_FLAG)
25      list(APPEND try_compile_flags "-fno-profile-instr-use")
26    endif()
27    if(LLVM_BUILD_INSTRUMENTED MATCHES IR AND COMPILER_RT_HAS_FNO_PROFILE_GENERATE_FLAG)
28      list(APPEND try_compile_flags "-fno-profile-generate")
29    elseif(LLVM_BUILD_INSTRUMENTED AND COMPILER_RT_HAS_FNO_PROFILE_INSTR_GENERATE_FLAG)
30      list(APPEND try_compile_flags "-fno-profile-instr-generate")
31    endif()
32  endif()
33
34  string(REPLACE ";" " " extra_flags "${try_compile_flags}")
35
36  set(test_compile_command "${CMAKE_C_COMPILE_OBJECT}")
37  foreach(substitution ${substitutions})
38    if(substitution STREQUAL "<CMAKE_C_COMPILER>")
39      string(REPLACE "<CMAKE_C_COMPILER>" "${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_ARG1}"
40             test_compile_command ${test_compile_command})
41    elseif(substitution STREQUAL "<OBJECT>")
42      string(REPLACE "<OBJECT>" "${TARGET_NAME}/CheckSectionExists.o"
43             test_compile_command ${test_compile_command})
44    elseif(substitution STREQUAL "<SOURCE>")
45      string(REPLACE "<SOURCE>" "${TARGET_NAME}/CheckSectionExists.c"
46             test_compile_command ${test_compile_command})
47    elseif(substitution STREQUAL "<FLAGS>")
48      string(REPLACE "<FLAGS>" "${CMAKE_C_FLAGS} ${extra_flags}"
49             test_compile_command ${test_compile_command})
50    else()
51      string(REPLACE "${substitution}" "" test_compile_command
52             ${test_compile_command})
53    endif()
54  endforeach()
55
56  # Strip quotes from the compile command, as the compiler is not expecting
57  # quoted arguments (potential quotes added from D62063).
58  string(REPLACE "\"" "" test_compile_command "${test_compile_command}")
59
60  string(REPLACE " " ";" test_compile_command "${test_compile_command}")
61
62  execute_process(
63    COMMAND ${test_compile_command}
64    RESULT_VARIABLE TEST_RESULT
65    OUTPUT_VARIABLE TEST_OUTPUT
66    ERROR_VARIABLE TEST_ERROR
67  )
68
69  # Explicitly throw a fatal error message if test_compile_command fails.
70  if(TEST_RESULT)
71    message(FATAL_ERROR "${TEST_ERROR}")
72    return()
73  endif()
74
75  execute_process(
76    COMMAND ${CMAKE_OBJDUMP} -h "${TARGET_NAME}/CheckSectionExists.o"
77    RESULT_VARIABLE CHECK_RESULT
78    OUTPUT_VARIABLE CHECK_OUTPUT
79    ERROR_VARIABLE CHECK_ERROR
80  )
81  string(FIND "${CHECK_OUTPUT}" "${section}" SECTION_FOUND)
82
83  if(NOT SECTION_FOUND EQUAL -1)
84    set(${output} TRUE PARENT_SCOPE)
85  else()
86    set(${output} FALSE PARENT_SCOPE)
87  endif()
88
89  file(REMOVE_RECURSE ${TARGET_NAME})
90endfunction()
91
92check_cxx_section_exists(".init_array" COMPILER_RT_HAS_INITFINI_ARRAY
93  SOURCE "volatile int x;\n__attribute__((constructor)) void f() {x = 0;}\nint main() { return 0; }\n")
94
95append_list_if(COMPILER_RT_HAS_STD_C11_FLAG -std=c11 CRT_CFLAGS)
96append_list_if(COMPILER_RT_HAS_INITFINI_ARRAY -DCRT_HAS_INITFINI_ARRAY CRT_CFLAGS)
97append_list_if(COMPILER_RT_CRT_USE_EH_FRAME_REGISTRY -DEH_USE_FRAME_REGISTRY CRT_CFLAGS)
98append_list_if(COMPILER_RT_HAS_FPIC_FLAG -fPIC CRT_CFLAGS)
99append_list_if(COMPILER_RT_HAS_WNO_PEDANTIC -Wno-pedantic CRT_CFLAGS)
100
101foreach(arch ${CRT_SUPPORTED_ARCH})
102  add_compiler_rt_runtime(clang_rt.crtbegin
103    OBJECT
104    ARCHS ${arch}
105    SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/crtbegin.c
106    CFLAGS ${CRT_CFLAGS}
107    PARENT_TARGET crt)
108  add_compiler_rt_runtime(clang_rt.crtend
109    OBJECT
110    ARCHS ${arch}
111    SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/crtend.c
112    CFLAGS ${CRT_CFLAGS}
113    PARENT_TARGET crt)
114endforeach()
115