Using pre-compiled headers with CMake

Question

I have seen a few (old) posts on the \'net about hacking together some support for pre-compiled headers in CMake. They all seem a bit all-over the place and everyone has the

Answer 1

An example of usage precompiled header with cmake and Visual Studio 2015

"stdafx.h", "stdafx.cpp" - precompiled header name.

Put the following below in the root cmake file.

if (MSVC)
    # For precompiled header.
    # Set 
    # "Precompiled Header" to "Use (/Yu)"
    # "Precompiled Header File" to "stdafx.h"
    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Yustdafx.h /FIstdafx.h")
endif()

---

Put the following below in the project cmake file.

"src" - a folder with source files.

set_source_files_properties(src/stdafx.cpp
    PROPERTIES
    COMPILE_FLAGS "/Ycstdafx.h"
)