Arch Linux

Prologue:

Andreas Radke Wrote:

 FS#24355  bug

"closing: The kernel does compile with our safe preset flags in makepkg.conf. Using custom flags is your fun (probably has to be fixed in the kernel code)."

NOTE FOR ANDREAS RADKE:

1) I did not add extra flags to kernel compilation, i take .config file of ARCH kernel and only removed unnecesary features, for example: I use AMD, so I'd remove "Intel Speed step", i do not have WiFi, so I'd remove "wireless support", ok? is _now_ clear enough for you?

2) In Fedora, Slackware, Gentoo, Debian, X-Men-Linux the kernel respete a standard, in archlinux also used to do it until GCC 4.5.2, steps:

cp /usr/src/linux-2.6.38-ARCH/.config /usr/src/linux-2.6.38.6/.config

cd /usr/src/linux-2.6.38.6/

make menuconfig

(remove a lot of unnecesary modules)

make -jX (X== number of cores + 1)
make modules_install
make install
mkinitcpio -k 2.6.38.6 -c /etc/mkinitcpio.conf -g /boot/vmlinuz-2.6.38.6.img
mv /boot/vmlinuz /boot/vmlinuz-2.6.38.6

Add all in new line in /boot/grub/menu.lst and reboot
It is standard in all distros, is into README of kernel and works fine with GCC 4.5.2 in all arch.

Clearly my "fun", as you call it, is not a reason for closing the bug at any case you could ask me to report it to upstream, do not ignore the bug please, a lot of users that use custom kernel and software are affected.
The /etc/makepkg.conf is not used in this procedure, i do not use PKGBUILD (for kernel compilation), a kernel is source code, is not necesary to package it.
The description show cleary the bug in gcc, and is reported in Debian sid, unstable, if ArchLinux use the equivalent to Debian sid packages, ok, is no my problem, but i see necessary to report the bug, do you get me?.
Sorry by the """rude""" mode, but i'm not used to receive such obvious answers and less without waiting a feedback from me before that; i like to report bugs cause i like to help to improve things, if i'm being annoying, then just say it and i will take a desicion.



Description:

content of test.c:

#include <stdio.h>

int main(void)
{
int x;
x = printf("hello, world\n");
return 0;
}


-------------------------------------------------------------

LANG=C gcc -Wall -Werror test.c; echo $?

test.c: In function 'main':
test.c:5:13: error: variable 'x' set but not used [-Werror=unused-but-set-variable]
cc1: all warnings being treated as errors

1
------------------------------------------------------------------
LANG=C gcc -Wunused-but-set-variable -Werror test.c; echo $?

test.c: In function 'main':
test.c:5:13: error: variable 'x' set but not used [-Werror=unused-but-set-variable]
cc1: all warnings being treated as errors

1
----------------------------------------------------------------------
LANG=C gcc -Werror=unused-but-set-variable test.c; echo $?

test.c: In function 'main':
test.c:5:13: error: variable 'x' set but not used [-Werror=unused-but-set-variable]
cc1: some warnings being treated as errors

1
-----------------------------------------------------------------------

In fact, i reproduce the same bug that Debian report in Sid, in Arch 32 and 64 bits, so, GCC is buggy, is not only the kernel, the kernel is just the proof of what those bugs produce in a code of thousands of lines.
I did observe that you apply a patch to kernel source code before compiling it.

See the link and the comments on it, read please:

http://lists.debian.org/debian-gcc/2011/02/msg00107.html

Thanks to jelle van der waa for the tip, is helpful ;) (LANG=C)

Regards