[gdal-dev] New build warning

[Even Rouault]

Our Mac instances must use the Apple-provided compiler I suppose. We 
also have a Linux CI config using a recent clang (from Fedora:rawhide, 
so cutting edge)

OpenMP detection is done through the CMake provided FindOpenMP module: 
https://cmake.org/cmake/help/latest/module/FindOpenMP.html

But I would expect your compiler to support it although it is not 
cutting edge.

You can explicitly disable it by setting -DGDAL_USE_OPENMP=OFF

Le 05/01/2026 à 18:41, Andrew Bell a écrit :
> Hi,
>
> It looks like CI is way ahead of my config. Are you using an 
> Apple-provided compiler or one from clang or elsewhere?
>
> [sd-integration] (gdal) $ clang++ --version
> Apple clang version 14.0.3 (clang-1403.0.22.14.1)
> Target: x86_64-apple-darwin22.5.0
> Thread model: posix
> InstalledDir: 
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
> On Mon, Jan 5, 2026 at 12:32 PM Even Rouault 
> <even.rouault at spatialys.com> wrote:
>
>     Hi Andrew,
>
>     openmp is enabled when available since
>     https://github.com/OSGeo/gdal/commit/2a3f06b90f2d68da446451a44090aa38fd6f4b5a#diff-c6d7b93ff4bf010c2c6218c9329af9afb9a00aab7871175046a9b50f26826452R435
>     .  What is your clang version ?  That warning are not shown on our
>     clang based CI configurations up to now.
>
>     Even
>
>     Le 05/01/2026 à 18:25, Andrew Bell via gdal-dev a écrit :
>>     Hi,
>>
>>     I updated to the latest master and am now seeing the following
>>     warning during compilation:
>>
>>     [156/1486] Building CXX object
>>     alg/CMakeFiles/alg.dir/thinplatespline.cpp.o
>>     clang: warning: argument unused during compilation: '-Xclang
>>     -fopenmp' [-Wunused-command-line-argument]
>>
>>     If anyone has some info on this, please let me know.
>>
>>     -- 
>>     Andrew Bell
>>     andrew.bell.ia at gmail.com
>>
>>     _______________________________________________
>>     gdal-dev mailing list
>>     gdal-dev at lists.osgeo.org
>>     https://lists.osgeo.org/mailman/listinfo/gdal-dev
>
>     -- 
>     http://www.spatialys.com
>     My software is free, but my time generally not.
>
>
>
> -- 
> Andrew Bell
> andrew.bell.ia at gmail.com

-- 
http://www.spatialys.com
My software is free, but my time generally not.
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