https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116545
Bug ID: 116545
Summary: Support old style statement attributes
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: andi-gcc at firstfloor dot org
Target Milestone: ---
Forked from PR83324. Applies to C/C++
It seems clang supports old style __attribute__ label attributes for musttail
(and presumably others) while gcc only supports the standard [[ ]] attributes.
With musttail working existing code that does
extern void foo(void);
void func(void)
{
#if __has_attribute(musttail)
__attribute__((musttail))
#endif
return foo();
}
builds on clang, but not on gcc. Bradley Lucier's scheme compiler does this
(see https://gcc.gnu.org/pipermail/gcc-help/2024-August/143676.html)
Short term we could make __has_attribute fails for just "musttail" (shouldn't
it be gnu::musttail or clang::musttail anyways?)
Or we support the old style attributes too which might be more compatible.
