http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57200
Bug #: 57200
Summary: [4.8/4.9] aggressive-loop-optimizations notes appear
even when warning itself is suppressed
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: [email protected]
ReportedBy: [email protected]
Test:
int x[10];
void fn ()
{
int i;
for (i = 0; i < 100; ++i)
x[i] = 1;
}
Using trunk at r198689:
gcc -O2 -c t.c
t.c: In function ‘fn’:
t.c:8:10: warning: iteration 10u invokes undefined behavior
[-Waggressive-loop-optimizations]
x[i] = 1;
^
t.c:7:3: note: containing loop
for (i = 0; i < 100; ++i)
^
Looks good. But this doesn't:
gcc -O2 -c t.c -w
t.c: In function ‘fn’:
t.c:7:3: note: containing loop
for (i = 0; i < 100; ++i)
^
A note suddenly appears from "nowhere" :-(
