http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54340
Bug #: 54340
Summary: internal compiler error: Illegal instruction (int
main() returns nothing, only when -O2/-O3 used)
Classification: Unclassified
Product: gcc
Version: 4.6.3
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: socketp...@gmail.com
$ gcc --version
gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ gcc test.c
$ LANG=C gcc -O2 test.c
test.c: In function 'main':
test.c:6:1: internal compiler error: Illegal instruction
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions.
Preprocessed source stored into /tmp/ccYojEN6.out file, please attach this to
your bugreport.
$ cat test.c
int main (void)
{
volatile int a;
if (a == 42)
return 1;
}
--------------------------------
If I add "return 0;" to the end of function - problem is fixed. I understand,
that program is not correct, but, as I think, gcc should not fail on that. It
seems, it is optimizer bug.
