[Buildroot] [PATCH] zsh: don't use host pcre-config

[Baruch Siach <baruch@tkos.co.il>]

Hi Thomas,

On Sun, Mar 06, 2016 at 01:23:13PM +0100, Thomas Petazzoni wrote:
> On Thu,  3 Mar 2016 23:46:10 +0200, Baruch Siach wrote:
> > +diff --git a/configure.ac b/configure.ac
> > +index c3bd713c126a..9947b16066b6 100644
> > +--- a/configure.ac
> > ++++ b/configure.ac
> > +@@ -925,7 +925,7 @@ fi
> > + if test x$enable_pcre = xyes; then
> > + dnl pcre-config should probably be employed here
> > + dnl AC_SEARCH_LIBS(pcre_compile, pcre)
> > +-  LIBS="`pcre-config --libs` $LIBS"
> > ++  LIBS="`$ac_cv_prog_PCRECONF --libs` $LIBS"
> 
> I think it is more correct to use the PRECONF variable rather than
> ac_cv_prog_PCRECONF. Indeed, you have:
> 
> AC_CHECK_PROG([PCRECONF], pcre-config, pcre-config)
> 
> The documentation of AC_CHECK_PROG (at [1]) says:
> 
> ? Macro: AC_CHECK_PROG (variable, prog-to-check-for, value-if-found, [value-if-not-found], [path = ?$PATH?], [reject])
> 
>    Check whether program prog-to-check-for exists in path. If it is
>    found, set <variable> to value-if-found, otherwise to
>    value-if-not-found, if given. Always pass over reject (an absolute
>    file name) even if it is the first found in the search path; in that
>    case, set <variable> using the absolute file name of the
>    prog-to-check-for found that is not reject. If <variable> was already
>    set, do nothing. Calls AC_SUBST for variable. The result of this
>    test can be overridden by setting the variable <variable> or the cache
>    variable ac_cv_prog_<variable>.
> 
> So to me, this means that the expected "output" of this macro is to set
> <variable>, which in your case is PRECONF.

Thanks for the information.

This patch is now upstream, so I'll send another one upstream changing 
$ac_cv_prog_PCRECONF to $PCRECONF. If upstream accepts that I'll send v2 with 
a combined patch.

baruch

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