Jan Palus ff41f2ae7c cf: link libatomic if needed ...

heimdal uses 8-byte (64-bits) atomic operations for a while now (ie in
lib/krb5/krcache.c). however some platforms (ie i386, i486, ARM < 7)
don't support them natively and need to be linked against libatomic in
order to implement functionallity from <stdatomic.h>.

if the header was found check 64-bit atomics work without any additional
libraries. if not try to add linking with libatomic. if that fails as
well fallback to -DHEIM_BASE_ATOMICS_FALLBACK

no change for platfroms without <stdatomic.h>

Fixes: #1186

2024-01-04 14:23:17 -06:00

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