[CMake] CPack and configure_file

[Eric Noulard]

2011/1/11 Michael Hertling <mhertling at online.de>:
> On 01/11/2011 12:55 AM, Tobias Ellinghaus wrote:
>>
>> Because some information (like latest git commit as version string) is no
>> longer available when using a source package. Of course I can put the
>> generated files into the source tree, but that's kind of against the idea of
>> out-of-source builds.
>
> You might use "cmake --build" in conjunction with a custom target:
>
> CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
> PROJECT(PKGSRC NONE)
> IF(EXISTS ${CMAKE_SOURCE_DIR}/manifest.txt)
>    # In packaged source tree.
>    FILE(COPY ${CMAKE_SOURCE_DIR}/manifest.txt
>         DESTINATION ${CMAKE_BINARY_DIR})
> ELSE()
>    # In original source tree.
>    FILE(WRITE ${CMAKE_BINARY_DIR}/manifest.txt "...\n")
>    INCLUDE(CPack)
>    ADD_CUSTOM_TARGET(pkgsrc
>        COMMAND ${CMAKE_COMMAND}
>            -E copy ${CMAKE_BINARY_DIR}/manifest.txt
>                    ${CMAKE_SOURCE_DIR}/manifest.txt
>        COMMAND ${CMAKE_COMMAND}
>            --build ${CMAKE_BINARY_DIR}
>            --target package_source
>        COMMAND ${CMAKE_COMMAND}
>            -E remove ${CMAKE_SOURCE_DIR}/manifest.txt
>    )
> ENDIF()

Nice solution.

> The pkgsrc target prepares the source tree for packaging, builds the
> source package via "cmake --build" and cleans up. AFAICS, writing to
> the source tree is unavoidable in order to achieve your aim,

in fact I think the "real" source for this is the fact the CPack lacks
the notion
of "EXTRA" distribution file which is available with autoconf, EXTRA_DIST var
http://www.gnu.org/software/hello/manual/automake/Basics-of-Distribution.html
or the dist-hook:
http://www.gnu.org/software/hello/manual/automake/The-dist-Hook.html#The-dist-Hook

The fact is CPack doesn't know much about "source package" and
in fact it package source using the CPACK_INSTALLED_DIRECTORIES directory list.
(look at the generated CPackSourceConfig.cmake)

I think you can "emulate" the extra thing of autoconf.
If you want ot package "more" than the source tree with
"package_source" you can try
the following in your main CMakeLists.txt (before include(CPack))

SET(CPACK_SOURCE_INSTALLED_DIRECTORIES
"${CMAKE_SOURCE_DIR};/;${CMAKE_BINARY_DIR}/extra;/extra")

then the content of the directory
${CMAKE_BINARY_DIR}/extra will added in the package source archive
inside "extra" dir.

it should work.

-- 
Erk
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