[cmake-developers] [PATCH] Allow LIB_SUFFIX be used as find path

[Christian Schmidbauer]

On Mon, Jun 13, 2016 at 5:22 PM, Brad King <brad.king at kitware.com> wrote:
> Hi Christian,
>
> Thanks for working on this.
>
> On 06/12/2016 05:59 AM, Christian Schmidbauer wrote:
>> A similar idea has already been suggested in #10287
>
> Yes.
>
>> and is required for bug #15594.
>
> That issue appears unrelated.  Did you typo the number?
>
Indeed, I meant bug #15994.

>>  Help/command/find_library.rst                      |  5 ++++
>>  Help/manual/cmake-properties.7.rst
>
> Please also add the FIND_LIBRARY_USE_CUSTOM_SUFFIX item documentation,
> or whatever it becomes after the discussion below.
>
Where do you want me to document it?

>> +If the :prop_gbl:`FIND_LIBRARY_USE_CUSTOM_SUFFIX` global property is set
>> +all search paths will be tested as normal, with `LIB_SUFFIX` appended, and
>> +with all matches of ``lib/`` replaced with `lib${LIB_SUFFIX}/`.  This property
>> +overrides both `FIND_LIBRARY_USE_LIB32_PATHS` and `FIND_LIBRARY_USE_LIB64_PATHS`.
> [snip]
>> +set_property(GLOBAL PROPERTY FIND_LIBRARY_USE_CUSTOM_SUFFIX TRUE)
>> +set(LIB_SUFFIX "XYZ")
>
> Typically the FIND_LIBRARY_USE_LIB{32,64}_PATHS global properties
> can be set by the platform information modules in CMake itself
> on platforms that need the behavior.  In what context might the
> FIND_LIBRARY_USE_CUSTOM_SUFFIX/LIB_SUFFIX values be set in practice?
>
> Thanks,
> -Brad
>
In custom environments, where neither lib, lib32 or lib64 would serve
the purpose but some custom library folder. I have a multilib system
with an additional "libx32" next to lib/lib32 and lib64. Currently,
you have to trick cmake in order to for libraries to be found. You
could go ahead and add a similar patch like the lib32 one, but I think
it's a better approach to let the user decide in such scenarios where
he wants cmake to look.

Best regards,
Chris