https://llvm.org/bugs/show_bug.cgi?id=22949
Bug ID: 22949
Summary: glibc 2.20 WIFCONTINUED raises a
-Wparentheses-equality warning
Product: clang
Version: 3.5
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
It complains about extra parentheses around comparison, however no such thing
exists in the source -- the warning concerns the expanded macros:
[lkundrak@belphegor NetworkManager]$ clang -Werror -Wparentheses-equality
-Wno-unused -c feh.c
feh.c:2:99: error: equality comparison with extraneous parentheses
[-Werror,-Wparentheses-equality]
void f () { if ((((__extension__ (((union { __typeof(0) __in; int __i; }) {
.__in = (0) }).__i))) == 0xffff)) return; }
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
feh.c:2:99: note: remove extraneous parentheses around the comparison to
silence this warning
void f () { if ((((__extension__ (((union { __typeof(0) __in; int __i; }) {
.__in = (0) }).__i))) == 0xffff)) return; }
~
^ ~
feh.c:2:99: note: use '=' to turn this equality comparison into an assignment
void f () { if ((((__extension__ (((union { __typeof(0) __in; int __i; }) {
.__in = (0) }).__i))) == 0xffff)) return; }
^~
=
1 error generated.
[lkundrak@belphegor NetworkManager]$ cat feh.c
#include <sys/wait.h>
void f () { if (WIFCONTINUED(0)) return; }
[lkundrak@belphegor NetworkManager]$
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