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45 lines
1.8 KiB
CMake
45 lines
1.8 KiB
CMake
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#
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# Christoph Heindl 2010
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# Precompiled Headers Demo
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# http://cheind.wordpress.com
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#
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# Instructs the MSVC toolset to use the precompiled header PRECOMPILED_HEADER
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# for each source file given in the collection named by SOURCE_VARIABLE_NAME.
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function(enable_precompiled_headers PRECOMPILED_HEADER SOURCE_VARIABLE_NAME)
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if(MSVC)
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set(files ${${SOURCE_VARIABLE_NAME}})
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# Generate precompiled header translation unit
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get_filename_component(pch_basename ${PRECOMPILED_HEADER} NAME_WE)
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set(pch_abs ${CMAKE_CURRENT_SOURCE_DIR}/${PRECOMPILED_HEADER})
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set(pch_unity ${CMAKE_CURRENT_BINARY_DIR}/${pch_basename}.cpp)
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set(pch_content "// Precompiled header unity generated by CMake\n#include <${pch_abs}>\n")
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# Read .cpp if exists
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if(EXISTS ${pch_unity})
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file(READ ${pch_unity} pch_content_prev)
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endif()
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# Compare existing .cpp content with the actual one
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if (pch_content_prev AND pch_content STREQUAL pch_content_prev)
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unset(pch_content)
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endif()
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# Write .cpp if it's out-of-date
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if (pch_content)
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FILE(WRITE ${pch_unity} "${pch_content}")
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endif()
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set_source_files_properties(${pch_unity} PROPERTIES COMPILE_FLAGS "/Yc\"${pch_abs}\"")
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# Update properties of source files to use the precompiled header.
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# Additionally, force the inclusion of the precompiled header at beginning of each source file.
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foreach(source_file ${files} )
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set_source_files_properties(
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${source_file}
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PROPERTIES COMPILE_FLAGS
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"/Yu\"${pch_abs}\" /FI\"${pch_abs}\""
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)
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endforeach(source_file)
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# Finally, update the source file collection to contain the precompiled header translation unit
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set(${SOURCE_VARIABLE_NAME} ${${SOURCE_VARIABLE_NAME}} ${pch_unity} PARENT_SCOPE)
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endif(MSVC)
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endfunction(enable_precompiled_headers)
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