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Do not write g_pch.cpp if it's already up-to-date
This eliminates rebuilding of main executable by MSVC on every project generation by CMake
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1 changed files with 13 additions and 2 deletions
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@ -14,8 +14,19 @@ function(enable_precompiled_headers PRECOMPILED_HEADER SOURCE_VARIABLE_NAME)
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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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FILE(WRITE ${pch_unity} "// Precompiled header unity generated by CMake\n")
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FILE(APPEND ${pch_unity} "#include <${pch_abs}>\n")
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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# Write .cpp if it's out-of-date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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