https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108079
Bug ID: 108079
Summary: -Wunused-variable gives misleading duplicate warning
for unused static local variable
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: stephenheumann at gmail dot com
Target Milestone: ---
For this program:
int main(void) {
static int x;
}
gcc -Wunused-variable reports:
<source>: In function 'main':
<source>:2:20: warning: unused variable 'x' [-Wunused-variable]
2 | static int x;
| ^
<source>: At top level:
<source>:2:20: warning: 'x' defined but not used [-Wunused-variable]
These two warnings are about the same thing, except the second one is
incorrectly labeled "At top level." There should just be one warning, without
"At top level."
C++ does the same thing, except it says "At global scope" instead of "At top
level."
This seems to be a regression that occurred in GCC 6: 5.4 just gives one
warning, but 6.1 also gives the extra one with "At top level."
