Review Request 118106: Simplify dep rule of writeodf.h to rng2cpp, work properly Windows

[Commit Hook]

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This review has been submitted with commit e0ba699f7e51aff2da902c170e8e5fea875a196c by Friedrich W. H. Kossebau to branch calligra/2.8.

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On May 15, 2014, 11:38 a.m., Friedrich W. H. Kossebau wrote:
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> https://git.reviewboard.kde.org/r/118106/
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> (Updated May 15, 2014, 11:38 a.m.)
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> Review request for Calligra, Yue Liu, Boudewijn Rempt, and Jos van den Oever.
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> Repository: calligra
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> Description
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> "find_program(RNG2CCP_EXECUTABLE rng2cpp [...])", as used to find the path to the rng2cpp executable on Windows, has the disadvantage that it will only work once rng2cpp has been build the first time.
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> Instead I propose to use the built-in resolution of the created executable and dependency creation with add_custom_command, see http://www.cmake.org/cmake/help/v2.8.0/cmake.html#command:add_custom_command:
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> If COMMAND specifies an executable target (created by ADD_EXECUTABLE) it will automatically be replaced by the location of the executable created at build time. Additionally a target-level dependency will be added so that the executable target will be built before any target using this custom command. However this does NOT add a file-level dependency that would cause the custom command to re-run whenever the executable is recompiled.
> [...]
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> Keeping rng2cpp and ${RNGFILE} as DEPENDS ensure that there is file-level dependency also to the executable.
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> Works for me on Linux. Does it also work on Windows and OSX?
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> Diffs
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>   libs/odf/writeodf/CMakeLists.txt 9a99d48 
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> Diff: https://git.reviewboard.kde.org/r/118106/diff/
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> Testing
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> Thanks,
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> Friedrich W. H. Kossebau
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