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Fix IPO detection for C++ builds - #3970
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Check only CXX so dependencies enabling C cannot disable LTO. Preserve explicit OFF, reject unsupported ON requests, and remove forced cache overrides. Update the Pixi comment to reflect automatic detection. Fixes scipp#3942
SimonHeybrock
approved these changes
Sep 9, 2026
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Check only CXX so dependencies enabling C cannot disable LTO. Preserve explicit OFF, reject unsupported ON requests, and remove forced cache overrides. Update the Pixi comment to reflect automatic detection.
Fixes #3942