Re: [PATCH] Revert 'Fix logic error in _AC_PROG_LEX_YYTEXT_DECL (#109320)'

[Paul Eggert]

On 7/16/20 11:40 AM, Zack Weinberg wrote:
> I believe that what's in trunk now should work fine for
> cross-compilation of programs that don't require yywrap

I thought so too, but after eyeballing the trunk a bit I noticed a shell 
portability bug in the recently-added AC_PROG_LEX code. I then found a couple 
more instances of the same bug elsewhere in Autoconf (in rarely-executed code, I 
think).

The problem is that constructs like ${ac_lib:-none needed} don't conform to 
POSIX, as POSIX requires that the stuff after the :- be a single shell word. 
(The next time I meet Steve Bourne I want to give him an earfull....)

I installed a doc patch describing the portability pitfall into Savannah master:

https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=2ff883c27e55b0c0d4a448614c1dee0492c9a7da

and would like to also install the attached patch to fix the code bugs. I have 
held off installing this latter patch, though, as I don't want to get in the way 
of whatever testing you're doing.

0001-Fix-VAR-NONWORD-bugs.patch
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