https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104633
Bug ID: 104633
Summary: [12 Regression] -Winfinite-recursion diagnoses fortify
wrappers
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
Target Milestone: ---
extern inline __attribute__((always_inline))
int memcmp (const void * p, const void *q, unsigned long size)
{
return __builtin_memcmp (p, q, size);
}
are diagnosed with
t.c: In function 'memcmp':
t.c:2:5: warning: infinite recursion detected [-Winfinite-recursion]
2 | int memcmp (const void * p, const void *q, unsigned long size)
| ^~~~~~
t.c:4:10: note: recursive call
4 | return __builtin_memcmp (p, q, size);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This pattern happens in glibc fortify wrappers (but need -Wsystem-headers in
addition to -Wall). It's reportedly also triggering for kernel wrappers
in its fortify-string.h which does not get the benefit of doubt via
-Wsystem-headers.
These kind of wrappers are not recursions (I think the kernel doesn't have
'extern' on the inline), inline instances will not be called itself and
__builtin_XXX are never inline expanded(?).
