I've experienced an internal compiler error attempting to compile
netpbm-10.35.75 under -Os optimization. I've reduced the problem file
(pamscale.c) down to a minimal example:
Script started on Mon Jun 28 10:15:13 2010
bash-4.1$ cat break-gcc.i
extern int bar(void);
int foo(float f, int i)
{
return f * 2 < i || bar();
}
bash-4.1$ gcc -c -Os -ffast-math break-gcc.i
break-gcc.i: In function 'foo':
break-gcc.i:6:1: error: unrecognizable insn:
(jump_insn 39 41 12 2 break-gcc.i:5 (set (pc)
(if_then_else (lt (reg:CCFP 17 flags)
(const_int 0 [0x0]))
(label_ref:SI 18)
(pc))) -1 (expr_list:REG_BR_PROB (const_int 6102 [0x17d6])
(nil))
-> 18)
break-gcc.i:6:1: internal compiler error: in extract_insn, at recog.c:2103
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
bash-4.1$ exit
exit
Script done on Mon Jun 28 10:15:35 2010
-Os and -ffast-math are both essential to trigger the bug.
--
Summary: Internal error (case derived from netpbm)
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: michael at talamasca dot ocis dot net
GCC build triplet: i386-pc-linux-uclibc
GCC host triplet: i386-pc-linux-uclibc
GCC target triplet: i386-pc-linux-uclibc
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44700
