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stdlib.h: Fix qsort_r compatibility with GCC 12.
GCC 12 (unlike GCC 9) does not match a function argument passed to the old qsort_r() API (as is used in the qsort_r_compat test) to a function pointer type via __generic. It treats the function type as a distinct type from a function pointer. As a workaround, add a second definition of qsort_r for GCC 12 which uses the bare function type. Reviewed by: emaste Differential Revision: https://reviews.freebsd.org/D37410
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@ -352,9 +352,15 @@ void __qsort_r_compat(void *, size_t, size_t, void *,
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__sym_compat(qsort_r, __qsort_r_compat, FBSD_1.0);
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#endif
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#if defined(__generic) && !defined(__cplusplus)
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#if __GNUC__ == 12
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#define qsort_r(base, nel, width, arg4, arg5) \
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__generic(arg5, int (void *, const void *, const void *), \
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__qsort_r_compat, qsort_r)(base, nel, width, arg4, arg5)
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#else
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#define qsort_r(base, nel, width, arg4, arg5) \
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__generic(arg5, int (*)(void *, const void *, const void *), \
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__qsort_r_compat, qsort_r)(base, nel, width, arg4, arg5)
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#endif
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#elif defined(__cplusplus)
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__END_DECLS
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extern "C++" {
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