Downgrading gcc

kewlemer · 04-04-2005, 04:33 AM

Folks,

I am trying to downgrade gcc to 3.2.2 from 3.4 since I have to comiple a 2.4 kernel for some application I am testing.

Unfortunately, this is proving to be extremely painful. Here is the probllem:

I tried installing gcc from .rpm and .src.rpm, without any success. I then tried building gcc from the sources. Some of the links I used were:-

[Please note that I have stripped off the URLs' h t t p : / / w w w since I am a new member and this site would not let me post URLs]

.tellurian.com.au/whitepapers/multiplegcc.php
This is pretty much what I did.

gcc.gnu.org/faq.html#multiple
faqs.org/docs/Linux-HOWTO/GCC-HOWTO.html

When I finally had a 3.2.2 gcc running, I tried doing the bzImage and these errors came up :-

Code:

.
.
.gmake[2]: Entering directory `/usr/src/linux-2.4.21/kernel'
gcc -D__KERNEL__ -I/usr/src/linux-2.4.21/include -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno
-strict-aliasing -fno-common -fomit-frame-pointer -pipe -mpreferred-stack-boundary=2 -march=i686
 -nostdinc -iwithprefix include -DKBUILD_BASENAME=sched  -fno-omit-frame-pointer -c -o sched.o sch
ed.c
In file included from /usr/src/linux-2.4.21/include/linux/wait.h:13,
                 from /usr/src/linux-2.4.21/include/linux/fs.h:12,
                 from /usr/src/linux-2.4.21/include/linux/capability.h:17,
                 from /usr/src/linux-2.4.21/include/linux/binfmts.h:5,
                 from /usr/src/linux-2.4.21/include/linux/sched.h:9,
                 from /usr/src/linux-2.4.21/include/linux/mm.h:4,
                 from sched.c:23:
/usr/src/linux-2.4.21/include/linux/kernel.h:10:20: stdarg.h: No such file
In file included from /usr/src/linux-2.4.21/include/linux/wait.h:13,
                 from /usr/src/linux-2.4.21/include/linux/fs.h:12,
                 from /usr/src/linux-2.4.21/include/linux/capability.h:17,
                 from /usr/src/linux-2.4.21/include/linux/binfmts.h:5,
                 from /usr/src/linux-2.4.21/include/linux/sched.h:9,
                 from /usr/src/linux-2.4.21/include/linux/mm.h:4,
                 from sched.c:23:
/usr/src/linux-2.4.21/include/linux/kernel.h:74: parse error before "va_lis
/usr/src/linux-2.4.21/include/linux/kernel.h:74: warning: function declarat
/usr/src/linux-2.4.21/include/linux/kernel.h:77: parse error before "va_lis
/usr/src/linux-2.4.21/include/linux/kernel.h:77: warning: function declarat
/usr/src/linux-2.4.21/include/linux/kernel.h:81: parse error before "va_lis
/usr/src/linux-2.4.21/include/linux/kernel.h:81: warning: function declarat
gmake[2]: *** [sched.o] Error 1
gmake[2]: Leaving directory `/usr/src/linux-2.4.21/kernel'
gmake[1]: *** [first_rule] Error 2
gmake[1]: Leaving directory `/usr/src/linux-2.4.21/kernel'
gmake: *** [_dir_kernel] Error 2
[root@postel linux-2.4.21]#

Googling on this I found:
linux.derkeiler.com/Mailing-Lists/Kernel/2004-03/5707.html
linux.derkeiler.com/Newsgroups/comp.os.linux.development.system/2003-10/0304.html

This indicates that the problem may still be with gcc.

Since I used the --prefix for gcc compilation, I figured the problem may be the one specified in :-
gcc.gnu.org/faq.html
and in particular, "How to install multiple versions of GCC". This also says the solution would be:-
gcc.gnu.org/faq.html#gas

I have no clue what this is saying and I hope you guys can shed some light on it.

Thanks,
Kewlemer

__J · 04-04-2005, 10:50 AM

stdarg.h is a standard c header and should come with you glibc install ( some distro's split this package (glibc-devel)).

For downgrading gcc, you shouldn't as there are alot easier ways than what you just did. not to mention if you downgraded g++ and it's associated libs, anything c++ related on your system probably doesn't work anymore. The easiest way ( this is my opinion, and there is multiple ways to do this) is to get the source for the older gcc, configure it with a prefix of something like /opt/gcc-3 or whatever ( dont forget to configure it correctly - gcc is NOT a ./configure, make, make install) and either set CC or PATH to pick up the new compiler when you want to use it instead of your system supplied compiler.