Re: AC_CHECK_DECL+autoheader ==> nothing in config.h.in?

[Derek Robert Price]

Sam Steingold wrote:

> I put AC_CHECK_DECL(signgam) in configure.in to check for the lgamma()
> sign indicator.
> I expected autoheader to place "#undef HAVE_DECL_SIGNGAM" in
> config.h.in, but it does not do that.
> Do I _have_ to use the full version, like
> AC_CHECK_DECL(signgam,
> AC_DEFINE([HAVE_DECL_SIGNGAM],[1],[lgamma sign is in signgam]),
> AC_DEFINE([HAVE_DECL_SIGNGAM],[0],[lgamma sign is not available]),
> [#include <math.h>] )
> ?? [I guess I do - because of math.h, but, still, AC_CHECK_DECL was
> supposed to put something in config.h.in, right?]
>  

AC_CHECK_DECLS defines the config.h.in variable automatically.  If you 
want to use AC_CHECK_DECL, yes, you have to use a construct like you 
mentioned.

Derek

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