<div dir="ltr">Thanks,<div><br></div><div>I upgraded cmake to the latest version thinking that perhaps the find script was bad, but that made no difference, so I disabled OpenMP as suggested.</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Mon, Jan 5, 2026 at 12:51 PM Even Rouault <<a href="mailto:even.rouault@spatialys.com">even.rouault@spatialys.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>

  
    
  
  <div>
    <p>Our Mac instances must use the Apple-provided compiler I suppose.
      We also have a Linux CI config using a recent clang (from
      <a>Fedora:rawhide</a>, so cutting edge)</p>
    <p>OpenMP detection is done through the CMake provided FindOpenMP
      module: 
      <a href="https://cmake.org/cmake/help/latest/module/FindOpenMP.html" target="_blank">https://cmake.org/cmake/help/latest/module/FindOpenMP.html</a></p>
    <p>But I would expect your compiler to support it although it is not
      cutting edge.</p>
    <p>You can explicitly disable it by setting -DGDAL_USE_OPENMP=OFF</p>
    <div>Le 05/01/2026 à 18:41, Andrew Bell a
      écrit :<br>
    </div>
    <blockquote type="cite">
      <div dir="ltr">
        <div dir="ltr">Hi,<br>
          <br>
          It looks like CI is way ahead of my config. Are you using an
          Apple-provided compiler or one from clang or elsewhere?</div>
        <div dir="ltr"><br>
        </div>
        <div dir="ltr">[sd-integration] (gdal) $ clang++ --version<br>
          Apple clang version 14.0.3 (clang-1403.0.22.14.1)<br>
          Target: x86_64-apple-darwin22.5.0<br>
          Thread model: posix<br>
          InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin</div>
        <div class="gmail_quote">
          <div dir="ltr" class="gmail_attr">On Mon, Jan 5, 2026 at
            12:32 PM Even Rouault <<a href="mailto:even.rouault@spatialys.com" target="_blank">even.rouault@spatialys.com</a>>
            wrote:<br>
          </div>
          <blockquote class="gmail_quote">
            <div>
              <p>Hi Andrew,</p>
              <p>openmp is enabled when available since
                <a href="https://github.com/OSGeo/gdal/commit/2a3f06b90f2d68da446451a44090aa38fd6f4b5a#diff-c6d7b93ff4bf010c2c6218c9329af9afb9a00aab7871175046a9b50f26826452R435" target="_blank">https://github.com/OSGeo/gdal/commit/2a3f06b90f2d68da446451a44090aa38fd6f4b5a#diff-c6d7b93ff4bf010c2c6218c9329af9afb9a00aab7871175046a9b50f26826452R435</a> 
                .  What is your clang version ?  That warning are not
                shown on our clang based CI configurations up to now.</p>
            </div>
          </blockquote>
          <blockquote class="gmail_quote">
            <div>
              <p>Even</p>
              <div>Le 05/01/2026 à 18:25, Andrew Bell via gdal-dev a
                écrit :<br>
              </div>
              <blockquote type="cite">
                <div dir="ltr">
                  <div>Hi,<br>
                    <br>
                    I updated to the latest master and am now seeing the
                    following warning during compilation:<br>
                    <br>
                    [156/1486] Building CXX object
                    alg/CMakeFiles/alg.dir/thinplatespline.cpp.o<br>
                    clang: warning: argument unused during compilation:
                    '-Xclang -fopenmp' [-Wunused-command-line-argument]<br>
                    <br>
                    If anyone has some info on this, please let me know.<br>
                    <br>
                  </div>
                  <span class="gmail_signature_prefix">-- </span><br>
                  <div dir="ltr" class="gmail_signature">
                    <div dir="ltr">
                      <div>Andrew Bell</div>
                      <a href="mailto:andrew.bell.ia@gmail.com" target="_blank">andrew.bell.ia@gmail.com</a></div>
                  </div>
                </div>
                <br>
                <fieldset></fieldset>
                <pre>_______________________________________________
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</pre>
              </blockquote>
              <pre cols="72">-- 
<a href="http://www.spatialys.com" target="_blank">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
            </div>
          </blockquote>
        </div>
        <div><br>
        </div>
        <div><br>
        </div>
        <span class="gmail_signature_prefix">-- </span><br>
        <div dir="ltr" class="gmail_signature">
          <div dir="ltr">
            <div>Andrew Bell</div>
            <a href="mailto:andrew.bell.ia@gmail.com" target="_blank">andrew.bell.ia@gmail.com</a></div>
        </div>
      </div>
    </blockquote>
    <pre cols="72">-- 
<a href="http://www.spatialys.com" target="_blank">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
  </div>

</blockquote></div><div><br clear="all"></div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div>Andrew Bell</div><a href="mailto:andrew.bell.ia@gmail.com" target="_blank">andrew.bell.ia@gmail.com</a></div></div>