[CMake] Exclude source files from build for a specific configuration with Visual Studio

[Gaylord Charles]

2011/4/3 Michael Hertling <mhertling at online.de>

> On 04/01/2011 03:02 PM, Gaylord Charles wrote:
> > Hello,
> >
> > I am migrating a project from Visual Studio 8 to CMake and I look for a
> way
> > to exclude files from build for a defined configuration.
> >
> > I think the "HEADER_FILE_ONLY" source file property can suit my needs and
> it
> > would be great to have a "HEADER_FILE_ONLY_<CONFIG> version.
> >
> > But maybe there is a "workaround" that enables to get this kind of
> behavior.
> >
> > Thanks,
> > Gaylord CHARLES
>
> AFAIK, you can not prevent the concerned files from being compiled, but
> you can prevent their object files from being incorporated in the final
> binaries. Admittedly, the method I could offer is somewhat weird:
>
> First of all, isolate the concerned files in a static library; linking
> against such a one is quite the same as incorporating the object files
> immediately. If desired, a shared library is alright, too. Further on,
> you need an intermediate empty static library as an imported target
> since imported targets can have arbitrary *configuration-specific*
> dependencies. Look at the following CMakeLists.txt:
>
> CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
> PROJECT(CONFIGEXCLUDE C)
> FILE(WRITE ${CMAKE_BINARY_DIR}/f.c "void f(void){}\n")
> ADD_LIBRARY(f STATIC f.c)
> ADD_LIBRARY(helper STATIC "")
> SET_TARGET_PROPERTIES(helper PROPERTIES LINKER_LANGUAGE "C")
> EXPORT(TARGETS helper NAMESPACE "reimp_"
>    FILE ${CMAKE_BINARY_DIR}/helper.cmake)
> INCLUDE(${CMAKE_BINARY_DIR}/helper.cmake)
> SET_TARGET_PROPERTIES(reimp_helper PROPERTIES
>    IMPORTED_LINK_INTERFACE_LIBRARIES "f"
>    IMPORTED_LINK_INTERFACE_LIBRARIES_CUSTOM "")
> FILE(WRITE ${CMAKE_BINARY_DIR}/main.c "int main(void){return 0;}\n")
> ADD_EXECUTABLE(main main.c)
> TARGET_LINK_LIBRARIES(main reimp_helper)
> ADD_DEPENDENCIES(main f helper)
>
> Target "f" comprises the files to exclude for a specific configuration.
> Target "helper" is the intermediate empty static library; it gets re-
> imported to the project to set its IMPORTED_LINK_INTERFACE_LIBRARIES
> property - to "f" generically and to "" for the "CUSTOM" configuration.
> Finally, target "main" is linked against the re-imported helper target.
> On *nix, I can see "main" being linked against libf.a unless the build
> type in CMAKE_BUILD_TYPE is set to "custom", and I suppose it'll work
> in Visual Studio, too. Note that you need to establish the dependency
> of main on f and the helper explicitly by ADD_DEPENDENCIES() because
> TARGET_LINK_LIBARIES() can't do this anymore.
>
> 'hope that helps.
>
> Regards,
>
> Michael
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Hello,

Ok, thank you very much for your help.

I tried your method today and it is quite good. I just had to make a little
modification to your sample code because it did not work under Visual
Studio. It seems that a library with no associated sources files is not
supported.

So, I changed :

ADD_LIBRARY(helper STATIC "")

into

FILE(WRITE ${CMAKE_BINARY_DIR}/empty.c "")
ADD_LIBRARY(helper STATIC empty.c)


Thanks again,

Regards,
Gaylord CHARLES
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