i686 use gcc-x32

dongfangxunlei · n00b Joined: 30 Jan 2013 Posts: 40

Hello，everyone!
I have found that gcc with x32 abi is faster than i686 amd amd64.But some softwares do not support x32 abi.So I want to install a x32 gcc in i686 system.Just the compiler and its depends such as glibc is x32 abi,all other packages will be i686.
How should I do? :lol:

erikm · l33t Joined: 08 Feb 2005 Posts: 634

I'm not sure I understand precisely what you want, but here are a few pointers:

Some applications are indeed faster when built as 32-bit on a multilib amd64 system, but most are faster as 64-bit (albeit somewhat larger and slower to load). The difference is usually negligibly small, though.
Even if you built an application as 32-bit, the CHOST would still be i686. Using an older CHOST (e.g. i386) is guaranteed to slow the application down significantly (~ 10%, if my memory serves).
Many if not most packages in the amd64 repository are ports from 32-bit code, and so in general work well when built as 32-bit. Doing so is just usually not the point of an amd64 system - if you truly want everything 32-bit, set portage to accept "x86" packages instead.
Assuming that you are correct, and 32-bit is faster, building only the compiler and toolchain as 32-bit would not speed any applications up, only compiles, and even them negligibly, since package build phases usually are not efficient enough to be truly CPU-limited.

In short, if I have understood you correctly, I believe you are mistaken in your beliefs, and recommend that you do nothing at all.

John R. Graham · Posted: Thu Jul 25, 2013 11:34 am Post subject:

Missing the point. X32 != 32-bit x86. Some reading for you. :wink:

- John
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erikm · l33t Joined: 08 Feb 2005 Posts: 634

Ah, I see, thanks!

That certainly looks like something I'd keep my toolchain lightyears away from, though ... :wink:

. My recommendation is unchanged, that is.

Jerry_McBride · n00b Joined: 23 Mar 2004 Posts: 10

These are old posts... but I've just become interested in this topic.

I manage a couple of 32 bit based servers and I would like to compile only 32 bit applications, etc. Including the tool chain. How does one compile a 32bit only tool chain and then applications?

xaviermiller · Posted: Sat Dec 27, 2014 7:44 pm Post subject:

in that case, take a i686 stage3
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Jerry_McBride · n00b Joined: 23 Mar 2004 Posts: 10

The gcc is multilib...