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- enable use of precompiled headers for MSVC. Thanks to a small CMake script I recently found this could be done non-invasively.

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Due to the VC++ 2015 headers being rather bloated (the average include size per source is 400-500kb) this provides a noticable compile speedup, although right now this only covers the game code, so there should be more room for improvement.
This commit is contained in:
Christoph Oelckers 2016-04-10 13:08:54 +02:00
commit 9cc873ecdd
2 changed files with 71 additions and 29 deletions
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34
precompiled_headers.cmake Normal file
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#
# Christoph Heindl 2010
# Precompiled Headers Demo
# http://cheind.wordpress.com
#
# Instructs the MSVC toolset to use the precompiled header PRECOMPILED_HEADER
# for each source file given in the collection named by SOURCE_VARIABLE_NAME.
function(enable_precompiled_headers PRECOMPILED_HEADER SOURCE_VARIABLE_NAME)
if(MSVC)
set(files ${${SOURCE_VARIABLE_NAME}})
# Generate precompiled header translation unit
get_filename_component(pch_basename ${PRECOMPILED_HEADER} NAME_WE)
set(pch_abs ${CMAKE_CURRENT_SOURCE_DIR}/${PRECOMPILED_HEADER})
set(pch_unity ${CMAKE_CURRENT_BINARY_DIR}/${pch_basename}.cpp)
FILE(WRITE ${pch_unity} "// Precompiled header unity generated by CMake\n")
FILE(APPEND ${pch_unity} "#include <${pch_abs}>\n")
set_source_files_properties(${pch_unity} PROPERTIES COMPILE_FLAGS "/Yc\"${pch_abs}\"")
# Update properties of source files to use the precompiled header.
# Additionally, force the inclusion of the precompiled header at beginning of each source file.
foreach(source_file ${files} )
set_source_files_properties(
${source_file}
PROPERTIES COMPILE_FLAGS
"/Yu\"${pch_abs}\" /FI\"${pch_abs}\""
)
endforeach(source_file)
# Finally, update the source file collection to contain the precompiled header translation unit
set(${SOURCE_VARIABLE_NAME} ${${SOURCE_VARIABLE_NAME}} ${pch_unity} PARENT_SCOPE)
endif(MSVC)
endfunction(enable_precompiled_headers)