https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87526
Bug ID: 87526
Summary: attribute alias ignored on a local declaration of an
extern function
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
GCC accepts extern declarations of aliases at file scope but complains for such
declarations at local scope:
$ cat x.c && gcc -S -Wall x.c
void f (void) { }
extern __attribute ((alias ("f"))) void f1 (void);
void g (void)
{
extern __attribute ((alias ("f"))) void f2 (void);
}
x.c: In function ‘g’:
x.c:7:3: warning: ‘alias’ attribute ignored [-Wattributes]
7 | extern __attribute ((alias ("f"))) void f2 (void);
| ^~~~~~
The following comment above the block that normally processes the attribute
suggests that the distinction might be an unintended result of some sort of a
hack that has been perhaps been removed (the function doesn't use
DECL_EXTERNAL).
/* Note that the very first time we process a nested declaration,
decl_function_context will not be set. Indeed, *would* never
be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that
we do below. After such frobbery, pushdecl would set the context.
In any case, this is never what we want. */
else if (decl_function_context (decl) == 0 && current_function_decl == NULL)
