https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95280
Bug ID: 95280
Summary: poor warning for attribute used on a function argument
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
GCC warns when attribute used is specified on a function argument (e.g., as a
mistake instead of unused) but the warning is devoid of any useful information:
$ cat z.c && gcc -S -Wall -Wextra z.c
int f (int __attribute__ ((used)) i);
z.c:1:1: warning: ‘used’ attribute ignored [-Wattributes]
1 | int f (int __attribute__ ((used)) i);
| ^~~
In contrast, Clang issues a much more informative message:
z.c:1:28: warning: 'used' attribute only applies to variables with non-local
storage, functions, and Objective-C methods [-Wignored-attributes]
int f (int __attribute__ ((used)) i);
^
1 warning generated.
