[CMake] How to force package target generate a file before proceeding

[Roman Bolshakov]

add_custom_command is rather used for operations performed during build phase (which is completely separate off packaging)




You could create hgHash.txt during packaging by using install(SCRIPT) command:

install(SCRIPT hgHash.cmake)


install(

  FILES hgHash.txt

  DESTINATION yourapp

)






Hypothetical hgHash.cmake would be quite straightforward:


message(STATUS "Getting hg hash")

execute_process(

  COMMAND hg --debug id -i

  OUTPUT_FILE hgHash.txt

)




That would create hgHash.txt unconditionally during each cpack/make install/cmake -P cmake_install.cmake invocation





-Roman




—
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On Wed, Feb 18, 2015 at 12:55 AM, Shyrokov, Sasha
<Sasha-Shyrokov at idexx.com> wrote:

> Hi,
> I would like to include a generated file into a package. I have something like that:
> include(CPack)
> add_custom_command (OUTPUT hgHash.txt
>     COMMAND hg --debug id -i >hgHash.txt
>     COMMENT "Getting hg hash")
> add_custom_target (hg_hash
>     DEPENDS hgHash.txt
>     COMMENT "hg_hash target")
> Now the following would solve my problems, but it does not work:
> add_dependencies(package hg_hash)
> I get:
> Cannot add target-level dependencies to non-existent target "package".
> I know I have CPack configured properly, because if I create the file manually it gets included. I also can add the dependency on one of my libraries, but I only want to generate this file when package is executed.
> What am I missing?
> Thanks,
> Sasha
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