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This patch fixes bug 16349, missing errno setting for atan2 underflow, by adding appropriate checks to the existing wrappers. (As in other cases, the __kernel_standard support for calling matherr is considered to be for existing code expecting existing rules for what's considered an error, even if those don't correspond to a general logical scheme for what counts as what kind of error, so __set_errno calls are added directly without any changes to __kernel_standard.) Tested x86_64 and x86. [BZ #16349] * math/w_atan2.c: Include <errno.h>. (__atan2): Set errno for result underflowing to zero. * math/w_atan2f.c: Include <errno.h>. (__atan2f): Set errno for result underflowing to zero. * math/w_atan2l.c: Include <errno.h>. (__atan2l): Set errno for result underflowing to zero. * math/auto-libm-test-in: Don't allow missing errno for some atan2 tests. * math/auto-libm-test-out: Regenerated.
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