Re: CMAKE_LIBRARY_PATH & co.

[ludo@gnu.org (Ludovic Courtès)]

Lluís Batlle i Rossell <viric@viric.name> skribis:

> On Mon, Oct 14, 2013 at 09:15:25AM +0200, Ludovic Courtès wrote:
>> Andreas Enge <andreas@enge.fr> skribis:
>> 
>> > commit e78fd4ca636a19bc286747f8d91bda22cd8f08fd
>> > Author: Andreas Enge <andreas@enge.fr>
>> > Date:   Sun Oct 13 18:02:49 2013 +0200
>> >
>> >     guix: Make cmake build system aware of usual paths.
>> >     
>> >     *  guix/build/cmake-build-system.scm (configure): Set CMAKE_LIBRARY_PATH to
>> >          LIBRARY_PATH and CMAKE_INCLUDE_PATH to CPATH.
>> 
>> I think this was discussed on IRC yesterday, but I’m not sure I got it:
>> are these needed because CMake explicitly looks for files in these
>> directories instead of just running the compiler?
>> 
>> That would be a serious flaw of CMake.
>
> Right; for what I understand, FIND_LIBRARY, and FIND_PATH, look for files in
> specific directories. Then cmake takes a decision based in what it finds. A
> shared object, a static lib, ...

Blech.

That’s flawed because CMake’s auto-configuration rules behave
differently from what the compiler/linker actually do.  So its
configuration phase may end up making decisions based on erroneous
information.

Thanks for the explanations,
Ludo’.