The following valid code snippet triggers an ICE on mainline
when compiled with "gcc -O -Wall -Werror" on i686-pc-linux-gnu.
=====================================================
int F0 (int);
int F1 (int t) { return F0(t); }
int F2 (int t) { return F0(t); }
extern int X[];
static inline int foo(int i)
{
return X[i];
}
int bar(int* p)
{
int i;
while ( ({ if (foo(*p) && foo(*p)); p; }) );
return i;
}
=====================================================
cc1: warnings being treated as errors
bug.c: In function 'bar':
bug.c:17: error: 'i' is used uninitialized in this function
bug.c:12: internal compiler error: Segmentation fault
Please submit a full bug report, [etc.]
Although the first functions aren't used in bar where the ICE happens,
they're needed to reproduce the ICE.
I can trace the bug back to at least 2007-05-13.
Janis, a regression hunt might be useful here.
Would you mind running one?
--
Summary: [4.3 regression] ICE with uninitialized variable and -
Werror
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-on-valid-code, monitored
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: reichelt at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34088
