Re: Success building seemingly native toolchain

["Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>]

Hello Richard!

Sorry for the long delay...

On Tuesday 15 September 2009 18:58:24 Richard Strand wrote:
> I had a problem where crosstool-ng would break when it was building NPTL 
> when using glibc 2.7 and above. As I am using i686 to build i486 I 
> suspect this was the "seemingly native toolchains do not build" bug.

Yes, you hit it.

> I have now managed to successfully get this to build by setting 
> CT_TARGET_CFLAGS="-O2".

Ah! So far, CT_TARGET_CFLAGS is used only to build the C library (except
uClibc) and gcc.

glibc (and eglibc) are known to mis-compile (or refuse to compile at
all) if -O is not specified in the CFLAGS. That's why it is currently
hard-coded in the scripts. It is not said in the gcc manual if -O
options are cumulative or if any -O option overrides any preceding
option; in the build scripts, -O is specified after CT_TARGET_CFLAGS.

I don't know about gcc, but building the final compiler is the only
place that uses CT_TARGET_CFLAGS. I can't say how this is used by the
gcc makefiles.

> Is this a known workaround for the problem (I couldn't find anything on 
> it), and does this work for everyone else?

This is not a known workaround. But it might be as good as any thing
else. Was your toolchain fully working? If so, then we might consider
changing the -O into a -O2.

Thanks for the info!

Regards,
Yann E. MORIN.

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