Re: HAVE_STDBOOL_H, AC_HEADER_STDBOOL, and AM_STDBOOL_H

[Eric Blake]

[dropping autoconf]

On 01/31/2011 04:47 PM, Paul Eggert wrote:
> The gnulib stdbool module currently arranges to #define HAVE_STDBOOL_H if 
> necessary,
> but this symbol is never used.  This is confusing people who port Emacs
> to systems that don't run 'configure', and I'd like to remove HAVE_STDBOOL_H
> from Emacs's src/config.in file.
> 
> HAVE_STDBOOL_H is defined by Autoconf's AC_HEADER_STDBOOL (and thus by 
> gnulib's,
> for compatibility with Autoconf).  The only gnulib macro that uses 
> AC_HEADER_STDBOOL
> is gnulib's AM_STDBOOL_H; the latter name is curious, as it implies that the 
> macro
> belongs to Automake, but it's a gnulib macro.

Actually, you also need to be careful with the gnulib file
tests/test-stdbool.h, which uses HAVE_STDBOOL_H as a pseudo-witness of
whether _Bool is a compiler built-in type (since some of the things we
test for are not possible with the replacement header).  I gather that
emacs is not using gnulib's test directory, but other projects are, so
HAVE_STDBOOL_H is still needed in those cases.

-- 
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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