gcc 3.2.2 seems to be crap, what to do ?!?

behd · Apprentice Joined: 11 Feb 2003 Posts: 155

Hie everyone,

I would need some guru advice !!! well I started to emerge a brand new system (no problem with stage 1 or 2). But when I tried to emerge mysql, it failed with silly error... having a look @ forum, it seems it doesn't compile with any release of gcc 3.2.2 !?!

So what would be the best solution ?!?
- having 2 version of gcc installed ?
- downgrading to an earlier version (3.2.1 seems fine)
- using some specific settings / flags with 3.2.2 (but which ???)

For any of those solutions what would be the best way to do it on gentoo ?

Thanks for any advice !!!

Sven Vermeulen · Posted: Tue Mar 04, 2003 8:42 am Post subject:

Try to make your CFLAGS gentle: "-march=<your cpu> -O3 -pipe" and nothing more. If that doesn't work, downgrade to the previous version (3.2.1) but do _not_ go to a 2-serie (incompatibility).

behd · Apprentice Joined: 11 Feb 2003 Posts: 155

I am a bit confused about CFLAGS, I've setuped in my make.conf
MARCH=pentium3 with optimization 04 but when I compile mysql,
it seems to use -03 and -AMDsmth ?!? (does the package have some rulez that could take precedence over your own settings ?)

cederberg · Posted: Tue Mar 04, 2003 10:22 am Post subject:

Yes, ebuilds may filter your CFLAGS. This is to avoid compilation breakages such as the one you encountered.

I'd personally go for this one if you want to play it safe:

behd · Apprentice Joined: 11 Feb 2003 Posts: 155

Thanks for your informations so far...

But if I need to downgrade my gcc, how could I do that in order to keep my system clean and functionnal ???

Does I have to unmerge current gcc and then emerge a previous version ??? (but by doing such, it seems I could have problem to run emerge after I deinstalled gcc 3.2.2, in fact I don't even see how I would compile old gcc 3.2.1?!?)

-> won't it be better to have 2 gcc installed then remove the 3.2.2 (or will it mess the library) ?

Anyway I don't even have a clue on how to emerge another package than last version synced... (-> how can I specify that I want to emerge version 3.2.1 ?!?)

Many thanks !!!

Sven Vermeulen · Posted: Tue Mar 04, 2003 12:58 pm Post subject:

You should not remove the 3.2.2. Just emerge the 3.2.1 by issuing

tyler · Posted: Tue Mar 04, 2003 2:48 pm Post subject:

Sven Vermeulen · Posted: Tue Mar 04, 2003 3:11 pm Post subject:

Every -O# with # > 3 will result in "-O3". gcc won't complain.

ebrostig · Posted: Tue Mar 04, 2003 10:11 pm Post subject:

For more info on GCC and optimizer flags see the following 2 articles:
GCC Myths and Facts
Optimizing GCC

Erik
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behd · Apprentice Joined: 11 Feb 2003 Posts: 155

- to all who provided infos: thanks !!!

- to tyler: nope I was using -04 (really

)... from my previous readings and knowledge, I used to think it can provide better optimization (even if apps could became unstable).

- to the one who has written somewhere in forum that the reading of gcc src code could be interesting and provide lot of infos: well even if knowledge is power, I am glad to sacrifice a bit of my knowledge and enjoy nightlife

---
My problem has finally been solved by using this flag for CFLAGS & CXXFLAGS: "-DHAVE_ERRNO_AS_DEFINE=1"
(btw. none of FLAGS proposed in this thread worked / being less agressive doesn't helped too)
cf. https://forums.gentoo.org/viewtopic.php?t=37732&highlight=mysql+errno

---

For the story, I having now exactly the same problem with 2 others packages:
- krb5
- smth related Xfree

Compiling hang again with:

rac · Posted: Wed Mar 05, 2003 7:44 pm Post subject:

The issue with "undefined reference to errno" is caused by an incompatible change in glibc in 2.3.2-pre. Declaring errno as an extern int is no longer supported - <errno.h> must be included explicitly. See bug #16267 for more details. This is one of those cases where people running ~arch must be prepared to deal with problems.
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