https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99014
Bug ID: 99014
Summary: -Werror -Wno-foo with foo unrecognized results in an
error if another warning is emitted
Product: gcc
Version: 9.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: vincent-gcc at vinc17 dot net
Target Milestone: ---
Consider the following tst.c file:
int f (void)
{
#ifdef F
int i;
#endif
return 0;
}
With gcc-9 (Debian 9.3.0-22) 9.3.0:
zira:~> gcc-9 -Wextra -Werror -Wno-error=unused-variable -Wno-foo -c tst.c
zira:~> gcc-9 -Wextra -Werror -Wno-error=unused-variable -Wno-foo -c tst.c -DF
tst.c: In function ‘f’:
tst.c:4:7: warning: unused variable ‘i’ [-Wunused-variable]
4 | int i;
| ^
tst.c: At top level:
cc1: error: unrecognized command line option ‘-Wno-foo’ [-Werror]
cc1: all warnings being treated as errors
while -Wno-foo should be ignored as usual.
Ditto with gcc-8 (Debian 8.4.0-7) 8.4.0.
With gcc-10 (Debian 10.2.1-6) 10.2.1 20210110, this is OK, -Wno-foo just emits
a non-fatal note:
zira:~> gcc-10 -Wextra -Werror -Wno-error=unused-variable -Wno-foo -c tst.c
zira:~> gcc-10 -Wextra -Werror -Wno-error=unused-variable -Wno-foo -c tst.c -DF
tst.c: In function ‘f’:
tst.c:4:7: warning: unused variable ‘i’ [-Wunused-variable]
4 | int i;
| ^
tst.c: At top level:
cc1: note: unrecognized command-line option ‘-Wno-foo’ may have been intended
to silence earlier diagnostics
