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cmake_minimum_required (VERSION 2.6)
project(PrecompiledHeader C)
# Make sure the proper compiler is in use.
if(NOT MSVC AND NOT "${CMAKE_C_COMPILER_ID}" MATCHES "^(Intel)$")
message(FATAL_ERROR "The PrecompiledHeader test works only with MSVC or Intel")
endif()
# Compute a custom name for the precompiled header.
if(CMAKE_CONFIGURATION_TYPES)
set(PCH_DIR "${CMAKE_CURRENT_BINARY_DIR}/PCH/${CMAKE_CFG_INTDIR}")
foreach(cfg ${CMAKE_CONFIGURATION_TYPES})
file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/PCH/${cfg})
endforeach()
else()
set(PCH_DIR "${CMAKE_CURRENT_BINARY_DIR}/PCH")
file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/PCH)
endif()
# The VS6 IDE does not support renaming .pch files with /Fp.
if("${CMAKE_GENERATOR}" MATCHES "Visual Studio 6")
set(PCH_USE_INCLUDE_DIR 1)
set(PCH_FILE)
else()
set(PCH_USE_INCLUDE_DIR 0)
set(PCH_FILE "\"/Fp${PCH_DIR}/foo_precompiled.pch\"")
endif()
# Choose between an explicit include path and using /I during
# precompilation. The /I form is used to test that the PCH is
# actually used. In practice the include path form would be used.
if(PCH_USE_INCLUDE_DIR)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)
else()
set(PCH_INCLUDE_DIR "\"/I${CMAKE_CURRENT_SOURCE_DIR}/include\"")
endif()
# Create a target that will use a precompiled header.
set(foo_SRCS foo1.c foo2.c)
add_executable(foo foo_precompile.c ${foo_SRCS})
# Setup flags on the target to create and use the precompiled header.
set_target_properties(foo PROPERTIES
COMPILE_FLAGS "/Yufoo_precompiled.h /FIfoo_precompiled.h ${PCH_FILE}")
set_source_files_properties(foo_precompile.c PROPERTIES
COMPILE_FLAGS "/Ycfoo_precompiled.h ${PCH_INCLUDE_DIR}")
# Setup dependencies for precompiled header creation and use. The VS
# IDE takes care of this automatically.
if("${CMAKE_GENERATOR}" MATCHES "Makefile" OR
"${CMAKE_GENERATOR}" MATCHES "Ninja")
# This source file creates the precompiled header as a side-effect.
set_source_files_properties(foo_precompile.c PROPERTIES
OBJECT_OUTPUTS "${PCH_DIR}/foo_precompiled.pch")
# These source files use the precompiled header.
set_source_files_properties(${foo_SRCS} PROPERTIES
OBJECT_DEPENDS "${PCH_DIR}/foo_precompiled.pch")
endif()
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