--- Comment #14 from pinskia at gcc dot gnu dot org 2008-11-15 00:28
---
(In reply to comment #12)
> smallish testcase, fwiw.
No that should have a call to argh.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36359
--- Comment #13 from aldot at gcc dot gnu dot org 2008-06-10 11:20 ---
should have been
int argh(void) __attribute__((error ("dce?")));
works without __builtin_constant_p and fails even with
-Os -ftree-dce -fweb -ftree-fre -ftree-pre
pr36359.c: In function 'foo':
pr36359.c:7: error: ca
--- Comment #12 from aldot at gcc dot gnu dot org 2008-06-10 11:07 ---
smallish testcase, fwiw.
$ gcc -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing
-fno-common -Werror-implicit-function-declaration -fno-stack-protector
-mregparm=3 -freg-struct-return -mpreferred-
--- Comment #11 from bunk at stusta dot de 2008-06-10 10:28 ---
(In reply to comment #7)
> Looking at http://www.readcode.org/code/linux-2.6.20/include/linux/log2.h it
> seems that either the argument to ilog _is_ zero or the compiler thinks so.
If you disassemble Mirco's usbcore.o you'
--- Comment #10 from bunk at stusta dot de 2008-06-10 10:11 ---
Created an attachment (id=15745)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15745&action=view)
Mirco's usbcore.o
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36359
--- Comment #9 from pinskia at gmail dot com 2008-06-08 00:33 ---
Subject: Re: [Regression] compile error in linux-kernel 2.6.26-rc4 with -O2
On Sat, Jun 7, 2008 at 5:17 PM, mt-ml at gmx dot de
<[EMAIL PROTECTED]> wrote:
> As you can see, the argument to ilog2 is urb->interval which ca
On Sat, Jun 7, 2008 at 5:17 PM, mt-ml at gmx dot de
<[EMAIL PROTECTED]> wrote:
> As you can see, the argument to ilog2 is urb->interval which can't be zero at
> that point IMHO.
Yes and that requires a lot of jump threading and many other
optimizations to detect that really. First PRE has to be w
--- Comment #8 from mt-ml at gmx dot de 2008-06-08 00:17 ---
I've been able to identify the code where ilog2 is called. If I do not choose
usbcore as a module I get the following error:
drivers/built-in.o: In function `usb_submit_urb':
(.text+0xc247f): undefined reference to `ilog2_N
--- Comment #7 from rguenth at gcc dot gnu dot org 2008-05-31 15:45 ---
Looking at http://www.readcode.org/code/linux-2.6.20/include/linux/log2.h it
seems that either the argument to ilog _is_ zero or the compiler thinks so.
--
rguenth at gcc dot gnu dot org changed:
What
--- Comment #6 from mt-ml at gmx dot de 2008-05-31 13:59 ---
I was able to find the function in which the error occurs. It's usb_submit_urb
in drivers/usb/core/urb.c I think.
The command:
$ gcc -c -save-temps drivers/usb/core/urb.c -I include
executed in the linux-kernel main directory g
--- Comment #5 from mt-ml at gmx dot de 2008-05-31 13:58 ---
Created an attachment (id=15707)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15707&action=view)
preprocessed sources of urb.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36359
--- Comment #4 from mt-ml at gmx dot de 2008-05-28 23:08 ---
(In reply to comment #2)
> This sounds like a kernel bug. At least we need preprocessed source of the
> source file in drivers/usb/core/usbcore.ko that generates the reference
> to ilog2_NaN.
>
Can you advise me please ho
--- Comment #3 from pinskia at gcc dot gnu dot org 2008-05-28 22:52 ---
http://lkml.org/lkml/2008/5/25/233
It says something about __builtin_constant_p being broken but I doubt it
really.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36359
--- Comment #2 from rguenth at gcc dot gnu dot org 2008-05-28 22:20 ---
This sounds like a kernel bug. At least we need preprocessed source of the
source file in drivers/usb/core/usbcore.ko that generates the reference
to ilog2_NaN.
--
rguenth at gcc dot gnu dot org changed:
--- Comment #1 from mt-ml at gmx dot de 2008-05-28 22:14 ---
Created an attachment (id=15695)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15695&action=view)
kernel config-file to reproduce error
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36359
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