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Fix _Float16 detection on ARM64 GCC<13 #8401

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Aug 29, 2024
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GCC 12 only supports _Float16 on x86. Support for ARM was added in GCC 13. This causes a build failure in the manylinux_2_28 images.

See Godbolt output here

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Linux worker 4 needs to rebuild LLVM 20... failures are unrelated.

@alexreinking alexreinking merged commit b87f2b1 into main Aug 29, 2024
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@alexreinking alexreinking deleted the alexreinking-patch-1 branch August 29, 2024 16:54
mcourteaux pushed a commit to mcourteaux/Halide that referenced this pull request Sep 15, 2024
GCC 12 only supports _Float16 on x86. Support for ARM was added in
GCC 13. This causes a build failure in the manylinux_2_28 images.
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