| 1 | ## SuggestCXXFlag, adds the following macros: |
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| 2 | # |
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| 3 | # SUGGEST_CXX_FLAGS(FLAGS VAR) |
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| 4 | # where FLAGS is a semi-colon separated list of flags, |
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| 5 | # each flag is added to VAR if the compiler accepts it |
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| 6 | # |
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| 7 | # SUGGEST_CXX_FLAG(FLAG VAR) |
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| 8 | # Check a single FLAG and add it to VAR if compiler accepts it |
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| 9 | # |
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| 10 | # SUGGEST_CXX_FLAG_DESC(FLAG VAR DESC) |
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| 11 | # Check a single FLAG and add to VAR if compiler accepts it, storing |
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| 12 | # the result of the checking in the variable DESC |
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| 13 | # |
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| 14 | |
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| 15 | MACRO(CHECK_CXX_ACCEPTS_FLAG FLAGS VARIABLE) |
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| 16 | IF(NOT DEFINED ${VARIABLE}) |
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| 17 | TRY_COMPILE(${VARIABLE} |
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| 18 | ${CMAKE_BINARY_DIR} |
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| 19 | ${CMAKE_ROOT}/Modules/DummyCXXFile.cxx |
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| 20 | CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${FLAGS} |
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| 21 | OUTPUT_VARIABLE OUTPUT) |
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| 22 | IF(${VARIABLE}) |
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| 23 | MESSAGE(STATUS "Checking to see if CXX compiler accepts flag ${FLAGS} - yes") |
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| 24 | FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log |
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| 25 | "Determining if the CXX compiler accepts the flag ${FLAGS} passed with " |
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| 26 | "the following output:\n${OUTPUT}\n\n") |
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| 27 | ELSE(${VARIABLE}) |
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| 28 | MESSAGE(STATUS "Checking to see if CXX compiler accepts flag ${FLAGS} - no") |
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| 29 | FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log |
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| 30 | "Determining if the CXX compiler accepts the flag ${FLAGS} failed with " |
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| 31 | "the following output:\n${OUTPUT}\n\n") |
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| 32 | ENDIF(${VARIABLE}) |
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| 33 | ENDIF(NOT DEFINED ${VARIABLE}) |
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| 34 | ENDMACRO(CHECK_CXX_ACCEPTS_FLAG) |
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| 35 | |
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| 36 | MACRO (SUGGEST_CXX_FLAG_DESC _FLAG _VAR _DESC) |
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| 37 | CHECK_CXX_ACCEPTS_FLAG(${_FLAG} ${_DESC}) |
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| 38 | if (${_DESC}) |
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| 39 | if (${_VAR}) |
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| 40 | SET(${_VAR} "${${_VAR}} ${_FLAG}") |
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| 41 | else (${_VAR}) |
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| 42 | SET(${_VAR} ${_FLAG}) |
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| 43 | endif (${_VAR}) |
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| 44 | MESSAGE("-- Added ${_FLAG} to ${_VAR}") |
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| 45 | endif (${_DESC}) |
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| 46 | ENDMACRO (SUGGEST_CXX_FLAG_DESC) |
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| 47 | |
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| 48 | MACRO (SUGGEST_CXX_FLAG _FLAG _VAR) |
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| 49 | STRING(REPLACE "-" "" _DESC ${_FLAG}) |
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| 50 | SET(_DESC "CXX_ACCEPTS_${_DESC}") |
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| 51 | SUGGEST_CXX_FLAG_DESC(${_FLAG} ${_VAR} ${_DESC}) |
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| 52 | ENDMACRO (SUGGEST_CXX_FLAG) |
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| 53 | |
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| 54 | MACRO (SUGGEST_CXX_FLAGS _FLAGS _VAR) |
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| 55 | foreach(_FLAG ${_FLAGS}) |
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| 56 | SUGGEST_CXX_FLAG(${_FLAG} ${_VAR}) |
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| 57 | endforeach(_FLAG) |
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| 58 | ENDMACRO (SUGGEST_CXX_FLAGS) |
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