https://bugs.llvm.org/show_bug.cgi?id=51849
Bug ID: 51849
Summary: False positives for -Wunused-but-set-variable with op
assignment operators (e.g. `|=`)
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: luismarq...@lowrisc.org
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
I think this is a false positive.
This happens with trunk (9aeecdfa8e91) and the latest RC (13.0.0-rc3):
$ cat test.c
void f(void) {
int result = 0;
#ifdef BUG
result |= 42;
#else
result = result | 42;
#endif
}
$ ./bin/clang -Wunused-but-set-variable -c test.c
$ ./bin/clang -Wunused-but-set-variable -c test.c -DBUG
test.c:2:7: warning: variable 'result' set but not used
[-Wunused-but-set-variable]
int result = 0;
^
1 warning generated.
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