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POCMake, Qt, gcc and precompiled headers
 

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  1. POCMake, Qt, gcc and precompiled headers
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    <p>I'm (once again) struggling with the creation of precompiled headers in conjunction with gcc and Qt on the Apple platform.</p> <p>When now creating my precompiled header I use a code section (based on good old "PCHSupport_26.cmake") to extract the compile flags as follows:</p> <pre><code>STRING(TOUPPER "CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE}" _flags_var_name) SET(_args ${CMAKE_CXX_FLAGS} ${${_flags_var_name}}) GET_DIRECTORY_PROPERTY(DIRINC INCLUDE_DIRECTORIES ) FOREACH(_item ${DIRINC}) LIST(APPEND _args "-I${_item}") ENDFOREACH(_item) GET_DIRECTORY_PROPERTY(_defines_global COMPILE_DEFINITIONS) LIST(APPEND defines ${_defines_global}) STRING(TOUPPER "COMPILE_DEFINITIONS_${CMAKE_BUILD_TYPE}" _defines_for_build_name) GET_DIRECTORY_PROPERTY(defines_build ${_defines_for_build_name}) LIST(APPEND _defines ${_defines_build}) FOREACH(_item ${_defines}) LIST(APPEND _args "-D${_item}") ENDFOREACH(_item ${_defines}) LIST(APPEND _args -c ${CMAKE_CURRENT_SOURCE_DIR}/${PRECOMPILED_HEADER} -o ${_gch_filename}) SEPARATE_ARGUMENTS(_args) </code></pre> <p>Unfortunately the above compiler flags miss two important parameter that CMake does generate when using the build-in compiler rules: <code>-DQT_DEBUG</code> and when compiling with the generated precompiled header, I get errors as follows: file.h: not used because <code>QT_DEBUG</code> is defined.</p> <p>I would need your help with the following:</p> <ol> <li>Is the above way to retrieve the compiler flags correct ?</li> <li>Is there a better, easier, simpler way to do this ?</li> <li>Why does <code>-DQT_DEBUG</code> not show up in <code>COMPILE_DEFINITIONS</code> or <code>COMPILE_DEFINITIONS_${CMAKE_BUILD_TYPE}</code></li> </ol>
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