Re: gcc -O2 error
On Sat, 22 Mar 2008 19:39:32 +0100 Kris Kennaway [EMAIL PROTECTED] wrote: So, did you consider perhaps following this advice? ;-) Kris Yes I did. The reason I send to this list also is that in make.conf manual says: CFLAGS(str) Controls the compiler setting when compiling C code. Optimization levels other than -O and -O2 are not sup- ported. That means that -O2 should be supported in FreeBSD. And now it happens to produce bad code. GCC people think that this should be fixed in gcc 4.3. I have not yet installed and verified that. However I tried the code with linux installation with gcc 4.1.2 and it was ok. As I don't known if gcc has some maintaining done in FreeBSD tree by patching or just by integrating the next snapshot from time to time. So I just though to report it in case that maintainers of FreeBSD version of gcc might want to take a look at this. -Mikael ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: gcc -O2 error
Mikael Ikivesi wrote: On Sat, 22 Mar 2008 19:39:32 +0100 Kris Kennaway [EMAIL PROTECTED] wrote: So, did you consider perhaps following this advice? ;-) Kris Yes I did. The reason I send to this list also is that in make.conf manual says: CFLAGS(str) Controls the compiler setting when compiling C code. Optimization levels other than -O and -O2 are not sup- ported. That means that -O2 should be supported in FreeBSD. And now it happens to produce bad code. GCC people think that this should be fixed in gcc 4.3. I have not yet installed and verified that. However I tried the code with linux installation with gcc 4.1.2 and it was ok. As I don't known if gcc has some maintaining done in FreeBSD tree by patching or just by integrating the next snapshot from time to time. So I just though to report it in case that maintainers of FreeBSD version of gcc might want to take a look at this. -Mikael The latter. When the gcc people fix it, if there is a patch that applies to 4.2 then we could import it. Kris ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: gcc -O2 error
On Sat, Mar 22, 2008 at 07:24:33PM +0200, Mikael Ikivesi wrote:
#include wchar.h
#include stdio.h
#define max_word_len64
wchar_t *wrong(wchar_t *wordlist, wchar_t *word)
{ wchar_t buffer[max_word_len+2];
buffer[max_word_len+2]=0;
STRIPPED PART
if(wcsstr(wordlist,buffer)==0) wcscpy(wordlist,buffer);
STRIPPED PART
return wordlist;
}
There's an off-by-one error in your code, which is very likely tickling
a bug in gcc.
That said, gcc shouldn't crash or be generating working code depending
upon which optimisation flags you use, so as Kris said, file a bug with
the gcc team for that.
--
| Jeremy Chadwickjdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, USA |
| Making life hard for others since 1977. PGP: 4BD6C0CB |
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Re: gcc -O2 error
On Sun, 23 Mar 2008 04:58:01 -0700 Jeremy Chadwick [EMAIL PROTECTED] wrote: There's an off-by-one error in your code, which is very likely tickling a bug in gcc. Thanks.. I know...took me a while to find it. And as code still seemed to work when built without -O2 it was hard to spot. I sent bug report to gcc team as the -O2 did bork it, regardless of my buggy coding :) -Mikael ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: gcc -O2 error
On Sun, Mar 23, 2008 at 09:27:45PM +0200, Mikael Ikivesi wrote: On Sun, 23 Mar 2008 04:58:01 -0700 Jeremy Chadwick [EMAIL PROTECTED] wrote: There's an off-by-one error in your code, which is very likely tickling a bug in gcc. Thanks.. I know...took me a while to find it. And as code still seemed to work when built without -O2 it was hard to spot. I sent bug report to gcc team as the -O2 did bork it, regardless of my buggy coding :) Thumbs up! :-) Despite the error, gcc still shouldn't behave that way, so I do hope they fix it. -- | Jeremy Chadwickjdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
gcc -O2 error
Hi
I am running uptodate RELENG_7. It has gcc (GCC) 4.2.1 20070719
[FreeBSD].
I tried to track down segfaults from my code and I accidentaly found a
optimization error. Code did not segfault when compiled without
optimization but crashed when -O2 was used.
I tried to track it I could make the gcc give me following error by
simply stripping few lines:
---
wrong.c: In function 'wrong':
wrong.c:11: error: Attempt to delete prologue/epilogue insn:
(insn/f 47 46 48 2 (set (mem:SI (plus:SI (reg/f:SI 6 bp)
(const_int -8 [0xfff8])) [0 S4 A8])
(reg:SI 3 bx)) -1 (nil)
(nil))
wrong.c:11: internal compiler error: in propagate_one_insn, at
flow.c:1735 Please submit a full bug report,
with preprocessed source if appropriate.
See URL:http://gcc.gnu.org/bugs.html for instructions.
--
And this is what triggers it:
#include wchar.h
#include stdio.h
#define max_word_len64
wchar_t *wrong(wchar_t *wordlist, wchar_t *word)
{ wchar_t buffer[max_word_len+2];
buffer[max_word_len+2]=0;
STRIPPED PART
if(wcsstr(wordlist,buffer)==0) wcscpy(wordlist,buffer);
STRIPPED PART
return wordlist;
}
-Mikael
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Re: gcc -O2 error
Mikael Ikivesi wrote: Hi I am running uptodate RELENG_7. It has gcc (GCC) 4.2.1 20070719 [FreeBSD]. I tried to track down segfaults from my code and I accidentaly found a optimization error. Code did not segfault when compiled without optimization but crashed when -O2 was used. I tried to track it I could make the gcc give me following error by simply stripping few lines: --- wrong.c: In function 'wrong': wrong.c:11: error: Attempt to delete prologue/epilogue insn: (insn/f 47 46 48 2 (set (mem:SI (plus:SI (reg/f:SI 6 bp) (const_int -8 [0xfff8])) [0 S4 A8]) (reg:SI 3 bx)) -1 (nil) (nil)) wrong.c:11: internal compiler error: in propagate_one_insn, at flow.c:1735 Please submit a full bug report, with preprocessed source if appropriate. See URL:http://gcc.gnu.org/bugs.html for instructions. So, did you consider perhaps following this advice? ;-) Kris ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
