Re: RFC: Use program_transform_name correctly

[Jim Blandy <jimb at redhat dot com>]

Daniel Jacobowitz <drow@mvista.com> writes:

> On Tue, Oct 07, 2003 at 04:59:21PM -0700, Felix Lee wrote:
> > Daniel Jacobowitz <drow@mvista.com>:
> > > Eh, you're right, this will teach me to answer without looking.  From
> > > gcc/Makefile.in:
> > >        t='$(program_transform_cross_name)'; echo ar | sed -e $$t ; \
> > > That's the idiom we should use here.
> > 
> > yeah, $$t should be unquoted because configure does the quoting,
> > so that a transformation that has quotes will work correctly.
> > however, this is only for "recent" versions of autoconf, where
> > recent is "some version of autoconf after 2.13 that still says
> > 'generated by 2.13' at the top of configure".
> > 
> > autoconf 2.13 and before will sometimes leave
> > program_transform_name null, which will cause that sed to fail.
> 
> How horrid.
> 
> > the newer autoconfs will make sure program_transform_name is
> > 's,x,x,' if it would otherwise be null.
> 
> Conveniently this is no longer an issue in the src repository (or in
> gcc).  The toplevel configure script now guarantees that
> $(program_transform_name) will not be empty.  So $$t it is.

Okay.  I'd better fix this up before I forget all this.