[Bug c/64637] New: Incorrect location for -Wunused-value warnings in for-loop
chengniansun at gmail dot com
gcc-bugzilla@gcc.gnu.org
Fri Jan 16 22:13:00 GMT 2015
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64637
Bug ID: 64637
Summary: Incorrect location for -Wunused-value warnings in
for-loop
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: chengniansun at gmail dot com
GCC emits a warning at the start of the for statement, whereas the unused value
is in the next line. This behavior could introduce confusion that the "for"
statement has no effect, which is not true.
$: cat s.c
void g();
void f(int b) {
for(int i = 0; i < b;
i + b) {
g();
}
}
$:
$: gcc-trunk -Wunused-value -c s.c
s.c: In function ‘f’:
s.c:4:3: warning: statement with no effect [-Wunused-value]
for(int i = 0; i < b;
^
$:
$: clang-trunk -Wunused-value -c s.c
s.c:5:9: warning: expression result unused [-Wunused-value]
i + b) {
~ ^ ~
1 warning generated.
$:
$:
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