Re: [PATCH] autoconf: Add test for sys/select.h header file

From: Robert Schiele <rschiele@gmail.com>
Date: Jan 25, 2008, 12:53 UTC
Message-ID: <20080125125304.GO30676@schiele.dyndns.org>
In-Reply-To: <alpine.LSU.1.00.0801251229250.5731@racer.site>

On Fri, Jan 25, 2008 at 12:30:27PM +0000, Johannes Schindelin wrote:

Show 22 quoted lines

> Hi,
> 
> On Fri, 25 Jan 2008, Jakub Narebski wrote:
> 
> > diff --git a/configure.ac b/configure.ac
> > index af177fd..85d7ef5 100644
> > --- a/configure.ac
> > +++ b/configure.ac
> > @@ -235,6 +235,12 @@ test -n "$NEEDS_SOCKET" && LIBS="$LIBS -lsocket"
> >  ## Checks for header files.
> >  AC_MSG_NOTICE([CHECKS for header files])
> >  #
> > +# Define NO_SYS_SELECT_H if you don't have sys/select.h.
> > +AC_CHECK_HEADER([sys/select.h],
> > +[NO_SYS_SELECT_H=],
> > +[NO_SYS_SELECT_H=UnfortunatelyYes])
> > +AC_SUBST(NO_SYS_SELECT_H)
> > +#
> 
> Just because I am curious: would that not define "NO_SYS_SELECT_H" in both 
> cases?  IOW would the "ifdef NO_SYS_SELECT_H" not be triggered all the 
> time?

No, in make the empty string is equal to not being defined.

Robert

-- 
Robert Schiele
Dipl.-Wirtsch.informatiker	mailto:rschiele@gmail.com

"Quidquid latine dictum sit, altum sonatur."