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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/104633] [12 Regression] -Winfinite-recursion diagnoses
 fortify wrappers
Date: Tue, 22 Feb 2022 10:50:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104633

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
The following is a valid use of extern inline I think

extern int memcmp (const void * p, const void *q, unsigned long size);

extern inline __attribute__((always_inline,gnu_inline))
int memcmp (const void * p, const void *q, unsigned long size)
{
  return memcmp (p, q, size);
}

int foo (const void * p, const void *q)
{
  return memcmp (p, q, 4);
}

I think the user needs to avoid name-lookup issues here by using an alias
for the call to memcmp in the inline wrapper which might also avoid the
diagnostic.  That __builtin_memcmp finds the memcmp definition is quite
unfortunate and makes it not usable as a way to avoid using an alias.=