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hdf: fix for GCC 15+ build#5662

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mathomp4:hdf4-gcc15
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hdf: fix for GCC 15+ build#5662
mathomp4 wants to merge 2 commits into
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mathomp4:hdf4-gcc15

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This PR sets -std=gnu17 when building with GCC 15+ as they now default to gnu23 and hdf raises errors. (This has been done to many other packages, see #5656 for example.)

@spackbot-triage spackbot-triage Bot added the update-package Modifications to packages in the repository label Jul 20, 2026
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spackbot-triage Bot requested a review from lrknox July 20, 2026 16:16
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