[llvm-dev] change in CMake variable names breaks existing uses and does not conform to CMake conventions

[Philip Pfaffe via llvm-dev]

Hi Everyone, (resending because I can't get the hang of Reply All)

I second Johannes.

cmake's own Find* man page suggests using the _DIRS variant "to keep things
consistent":
https://cmake.org/cmake/help/git-master/manual/cmake-developer.7.html#standard-variable-names

Granted, we're supporting Config-mode and not Module-mode, but i think the
variable name rules should still apply for consistency.

Best
Philip

2016-09-01 13:31 GMT+02:00 Mueller-Roemer, Johannes Sebastian via llvm-dev <
llvm-dev at lists.llvm.org>:

> Hi Chris and everyone else,
>
>
>
> I just noticed that some of my builds broke due to commit 280013, as
> LLVM_INCLUDE_DIRS was renamed to LLVM_INCLUDE_DIR. In and of itself, not
> much of an issue as the fix is just to remove one character (in a couple of
> places). However, I would like to discuss if this rename is desirable at
> all. Sure, in-tree LLVM_INCLUDE_DIR is used everywhere, however not
> providing an ${NAME}_INCLUDE_DIRS variable goes against CMake conventions.
> See for example the find scripts included with CMake itself:
>
>
>
> https://cmake.org/cmake/help/v3.6/module/FindZLIB.html -> provides
> ZLIB_INCLUDE_DIRS (and not ZLIB_INCLUDE_DIR) even though it is typically
> only one directory
>
>
>
> And the same holds true for most  other Find${NAME}.cmake scripts I had a
> look at (Boost, Bullet, CUDA, Freetype, XMLRPC, Zlib). I’ll admit there are
> 1 or 2 exceptions (such as OpenGL) but in general I think it would be
> better to stick to the more common/conventional case.
>
>
>
> Thoughts?
>
>
>
> Regards
>
> Johannes
>
>
>
>
>
> Fraunhofer-Institut für Graphische Datenverarbeitung IGD
>
> Fraunhoferstr. 5  |  64283 Darmstadt  |  Germany
>
> Tel +49 6151 155-606  |  Fax +49 6151 155-139
>
> johannes.mueller-roemer at igd.fraunhofer.de | www.igd.fraunhofer.de
>
>
>
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