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Improve check for a function attribute support.

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The compiler may advertise function attribute support
with __has_attribute operator even though it does
not implement the feature on some architecture.

This fixes the issue with  GCC 11 on ppc64le with
__attribute__((zero_call_used_regs("used"))).

Fixes: #959.
This commit is contained in:
Ondrej Kozina
2025-09-11 11:30:25 +02:00
parent 2b9523a1ef
commit 3a8feb8be7
3 changed files with 37 additions and 3 deletions
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4
lib/crypto_backend/memutils.c
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@@ -9,11 +9,9 @@
#define ATTR_NOINLINE __attribute__ ((noinline))
#define ATTR_ZERO_REGS
#if defined __has_attribute
# if __has_attribute (zero_call_used_regs)
#if HAVE_ATTRIBUTE_ZEROCALLUSEDREGS
# undef ATTR_ZERO_REGS
# define ATTR_ZERO_REGS __attribute__ ((zero_call_used_regs("used")))
# endif
#endif
/* Workaround for https://github.com/google/sanitizers/issues/1507 */