Cross-platform open-source make system ()

Loaden | 6 Sep 2012 00:30

Add sources to a target library after add_library()?

Hi, I look this ML: http://www.cmake.org/pipermail/cmake/2010-January/034437.html
Does CMake still can't support how to add sources to a target library after add_library()?
I wan't support Precompiled Header for both MSVC / GCC(MinGW).
In MSVC case, it need a source, e.g. StdAfx.cpp to support PCH.
But in GCC case, it only need a header, e.g. pch.h
Any help or comments or tips are best welcome!
See: https://codereview.qt-project.org/#change,34052

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Best Regards

Yuchen

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Mathias Gaunard | 6 Sep 2012 03:34

Re: Add sources to a target library after add_library()?

On 06/09/2012 00:30, Loaden wrote:
> Hi, I look this ML:
> http://www.cmake.org/pipermail/cmake/2010-January/034437.html
> Does CMake still can't support how to add sources to a target library
> after add_library()?
> I wan't support Precompiled Header for both MSVC / GCC(MinGW).
> In MSVC case, it need a source, e.g. StdAfx.cpp to support PCH.
> But in GCC case, it only need a header, e.g. pch.h
> Any help or comments or tips are best welcome!
> See: https://codereview.qt-project.org/#change,34052

I don't see what this feature would have to do with precompiled headers.

To use a precompiled header with GCC, just add -include 
path/to/precompiled/header.hpp to your compilation flags, and make sure 
you've built path/to/precompiled/header.hpp.gch before that.
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Loaden | 6 Sep 2012 07:51

Re: Add sources to a target library after add_library()?

Yes, it simply for GCC. But it is diffrent for MSVC compiler.

for MSVC, we have to use a .cpp file, e.g. stdafx.cpp to support precompiled. (/Yc flags)

For now, I have to implement it like this to support both MSVC and GCC's PCH support.

set(target Core)

if (QTCREATOR_PRECOMPILED AND MSVC)
    set(precompiled libpch.cpp)
endif()

set(sources
    lib.cpp
    lib2.cpp
)

add_qtcreator_plugin(${target}
    ${sources}
    ${precompiled}
)

add_dependencies(${target} Botan)

if (QTCREATOR_PRECOMPILED)
    add_precompiled_header(${target} "CXX" libpch.h ${precompiled})
    use_precompiled_header(${target} "${sources}")
endif()

2012/9/6 Mathias Gaunard <mathias.gaunard-vYW+cPY1g1pg9hUCZPvPmw@public.gmane.org>

To use a precompiled header with GCC, just add -include path/to/precompiled/header.hpp to your compilation flags, and make sure you've built path/to/precompiled/header.hpp.gch before that.

Best Regards

Yuchen

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