[CMake] Set Source Property For Specific Target

[David Cole]

There is a very old, long-standing open bug (in the "backlog" now)
that outlines many of the issues related to supporting pre-compiled
headers.

  http://public.kitware.com/Bug/view.php?id=1260

Doing a "copy and rename" strategy for StdAfx.cpp is a reasonable
work-around until such time as this can be addressed in a general way.
General support for this particular feature does not appear to be on
any short-term horizon as far as I'm aware.


HTH,
David


On Thu, Mar 17, 2011 at 1:53 PM, Kawicki, Ryan H
<Ryan.H.Kawicki at boeing.com> wrote:
>> > Quick question.
>> >
>> > I am trying to add precompiled headers to a project that
>> has been converted to use Cmake.
>> >
>> > In our library directory, we include all our source and
>> build two targets (one static and one dynamic), but setting
>> multiple source values only affects the source and not the
>> source associated to a particular target.  Is there a way to
>> get around this issue or something in the works to correct
>> this, like an optional target command?
>> >
>> > Thanks...
>> >
>> > Code below describing the issue:
>> >
>> > FUNCTION (ADD_MSVC_PRECOMPILED_HEADERS
>> >           PrecompiledSource PrecompiledHeader TargetProject)
>> >   IF (MSVC)
>> >     # define the location of the precompiled header
>> >     SET(PrecompiledBinary
>> "${CMAKE_CURRENT_BINARY_DIR}/${TargetProject}.pch")
>> >     # set the target project to use the precompiled binary
>> >     SET_PROPERTY(TARGET ${TargetProject}
>> >                  APPEND
>> >                  PROPERTY COMPILE_FLAGS
>> >                  "/Yu\"${PrecompiledHeader}\"
>> /Fp\"${PrecompiledBinary}\"")
>> >     # set the source file to compile out the pch
>> >     SET_PROPERTY(SOURCE ${PrecompiledSource}
>> >                  APPEND
>> >                  PROPERTY COMPILE_FLAGS
>> >                  "/Yc\"${PrecompiledHeader}\"
>> /Fp\"${PrecompiledBinary}\"")
>> >   ENDIF (MSVC)
>> > ENDFUNCTION (ADD_MSVC_PRECOMPILED_HEADERS)
>> >
>> > ADD_LIBRARY(MyLibDynamic SHARED ${SRC})
>> ADD_LIBRARY(MyLibStatic STATIC
>> > ${SRC})
>> >
>> > ADD_MSVC_PRECOMPILED_HEADERS(StdAfx.cpp StdAfx.h MyLibDynamic)
>> > ADD_MSVC_PRECOMPILED_HEADERS(StdAfx.cpp StdAfx.h MyLibStatic)
>> >
>> > When MyLibDynamic builds, it builds MyLibStatic.pch but
>> tries to find MyLibDynamic.pch.
>> > This is because the second function call to setup
>> precompiled headers
>> > modifies what appears to be a property that is not unique to all
>> > targets added at the same directory level of the CMakeLists.
>> >
>> > Thanks again. . .
>>
>> You might copy or symlink the concerned sources, one per
>> target, and impose the properties on these symlinks, e.g. as follows:
>>
>> ADD_CUSTOM_COMMAND(
>>     OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/StdAfxDynamic.cpp
>>     OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/StdAfxStatic.cpp
>>     COMMAND ${CMAKE_COMMAND} -E create_symlink
>>         ${CMAKE_CURRENT_SOURCE_DIR}/StdAfx.cpp
>>         ${CMAKE_CURRENT_BINARY_DIR}/StdAfxDynamic.cpp
>>     COMMAND ${CMAKE_COMMAND} -E create_symlink
>>         ${CMAKE_CURRENT_SOURCE_DIR}/StdAfx.cpp
>>         ${CMAKE_CURRENT_BINARY_DIR}/StdAfxStatic.cpp
>>     DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/StdAfx.cpp
>> )
>>
>> ADD_LIBRARY(MyLibDynamic SHARED StdAfxDynamic.cpp ${SRC})
>> ADD_LIBRARY(MyLibStatic STATIC StdAfxStatic.cpp ${SRC})
>>
>> ADD_MSVC_PRECOMPILED_HEADERS(StdAfxDynamic.cpp StdAfx.h
>> MyLibDynamic) ADD_MSVC_PRECOMPILED_HEADERS(StdAfxStatic.cpp
>> StdAfx.h MyLibStatic)
>>
>> Of course, SRC mustn't contain StdAfx.cpp anymore for this to work.
>>
>> 'hope that helps.
>>
>> Regards,
>>
>> Michael
>
> Thanks for the reply.  While I haven't tested this solution out,
> I don't think I would prefer this kind of solution, as I would
> hope that CMake would support this option out of the box.
>
> Looks like I'll have to see if there is a ticket for this
> kind of change or search the code to see how hard this
> can be added to CMake.
>
> Thanks,
>
> Ryan
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