[LLVMdev] Registering '-march=' option for LLC

[Tanya M. Lattner]

> > Thank you for replying to me. As you recommended, I modified 
> > configure.ac in autoconf folder. But I’m not sure about how to 
> > regenerate configure. Sorry…
> > I tried to follow the way introduced in README.TXT in the autoconf 
> > folder. It asks me to run autoupdate on all the m4 and configure.ac. And 
> > then it asks me to regenerate configure script with AutoRegen.sh. 
> > However, when I did that, I got an error like this: 
> > Your libtool was not detected as being 1.5.10
> 
> You need to have the latest version of libtool (1.5.22). You may get 
> similar errors for other things (autoconf, aclocal, etc). If so, upgrade 
> those as well.

>That's actually not quite correct. You need to have exactly libtool
>1.5.10. No other version will work. The reason is that we have
>incorporated the 1.5.10 version of the ltdl library (and autoconf
>checks) into LLVM. Perhaps its time to upgrade, but 1.5.10 is what LLVM
>expects and works with.

Ah sorry. Is this 1.8? LLVM 1.9 requires 1.5.22. I forgot we haven't 
technically released that yet
;)

-Tanya