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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.
      4 function(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()
     49 endfunction()
     50 
     51 function(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()
     62 endfunction()
     63