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1
2# This function takes an OS and a list of architectures and identifies the
3# subset of the architectures list that the installed toolchain can target.
4function(try_compile_only output)
5  set(SIMPLE_C ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/src.c)
6  file(WRITE ${SIMPLE_C} "int foo(int x, int y) { return x + y; }\n")
7  string(REGEX MATCHALL "<[A-Za-z0-9_]*>" substitutions
8         ${CMAKE_C_COMPILE_OBJECT})
9  string(REPLACE ";" " " extra_flags "${ARGN}")
10
11  set(test_compile_command "${CMAKE_C_COMPILE_OBJECT}")
12  foreach(substitution ${substitutions})
13    if(substitution STREQUAL "<CMAKE_C_COMPILER>")
14      string(REPLACE "<CMAKE_C_COMPILER>"
15             "${CMAKE_C_COMPILER}" test_compile_command ${test_compile_command})
16    elseif(substitution STREQUAL "<OBJECT>")
17      string(REPLACE "<OBJECT>"
18             "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/test.o"
19             test_compile_command ${test_compile_command})
20    elseif(substitution STREQUAL "<SOURCE>")
21      string(REPLACE "<SOURCE>" "${SIMPLE_C}" test_compile_command
22             ${test_compile_command})
23    elseif(substitution STREQUAL "<FLAGS>")
24      string(REPLACE "<FLAGS>" "${CMAKE_C_FLAGS} ${extra_flags}"
25             test_compile_command ${test_compile_command})
26    else()
27      string(REPLACE "${substitution}" "" test_compile_command
28             ${test_compile_command})
29    endif()
30  endforeach()
31
32  string(REPLACE " " ";" test_compile_command "${test_compile_command}")
33
34  execute_process(
35    COMMAND ${test_compile_command}
36    RESULT_VARIABLE result
37    OUTPUT_VARIABLE TEST_OUTPUT
38    ERROR_VARIABLE TEST_ERROR
39  )
40  if(result EQUAL 0)
41    set(${output} True PARENT_SCOPE)
42  else()
43    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
44        "Testing compiler for supporting " ${ARGN} ":\n"
45        "Command: ${test_compile_command}\n"
46        "${TEST_OUTPUT}\n${TEST_ERROR}\n${result}\n")
47    set(${output} False PARENT_SCOPE)
48  endif()
49endfunction()
50
51function(builtin_check_c_compiler_flag flag output)
52  if(NOT DEFINED ${output})
53    message(STATUS "Performing Test ${output}")
54    try_compile_only(result ${flag})
55    set(${output} ${result} CACHE INTERNAL "Compiler supports ${flag}")
56    if(${result})
57      message(STATUS "Performing Test ${output} - Success")
58    else()
59      message(STATUS "Performing Test ${output} - Failed")
60    endif()
61  endif()
62endfunction()
63