[LLVMdev] Re: IMPORTANT: autoconf changes

[Reid Spencer]

FYI,

The changes to make libtool appear as mklib have now also been
committed. If you want to have support for mklib in your build tree,
here's what you do:

cd $objdir
rm libtool
$srcdir/configure --prefix=... --llvmgccdir=...

After configure runs, you should have a "mklib" script in your $objdir
and the Makefile.rules have been configured to use it.

Reid.

On Sun, 2004-09-19 at 16:52, Reid Spencer wrote:
> Folks,
> 
> ** IF YOU DON'T EVER REBUILD "configure" YOU CAN SKIP THIS **
> 
> I've recently committed a slew of changes in the llvm/autoconf
> directory. I'll describe why below, but you need to know upfront the
> impact to you. Basically, if you touch configure.ac and use AutoRegen.sh
> then you MUST be using:
> 
> autoconf 2.59
> autoheader 2.59
> libtool 1.5.10
> aclocal 1.9.1
> 
> The AutoRegen.sh script now checks for these explicit versions before it
> allows the configure script to be regenerated.
> 
> The basic problem is that we have our own autoconf macros that interact
> with other tools. The biggest such case is libtool. The libtool.m4 file
> that provides all the autoconf checks libtool needs used to be in
> acinclude.m4 (which is now deprecated). When I removed acinclude.m4 a
> few weeks ago, I thought I was doing a good thing by not including the
> libtool macros (they get automatically included by aclocal). However,
> what I didn't notice is that the libtool macros (e.g. AC_PROG_LIBTOOL
> and friends) had been altered slightly: libtool's name had been changed
> to mklib. This was done to avoid tab completion errors for "llvm/lib"
> since libtool would also match. So, in order to restore this capability
> (at Chris' request), here's what I've done:
> 
> * copied the 1.5.10 version of libtool.m4 into the autoconf/m4 directory
>   and put a huge caveat at the top of it. Basically, this is a really 
>   dumb thing to do. When libtool 1.6 comes out, these tests will be both
>   out of date and automatically included. Essentially, we'll break until
>   we replace autoconf/m4/libtool.m4 with the 1.6 version.
> 
> * augmented the autoconf/AutoRegen.sh script to make *sure* its using
>   libtool 1.5.10 or else it will refuse to generate a new configure
>   script. This at least gets us part of the way to preventing bad things
>   from happening.
> 
> FYI: tab completion is just ONE MORE reason why you shouldn't build with
> $objdir == $srcdir ;>
> 
> Reid.
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