Re: A target_os conditionally applied -lfoo switch

[Earnie Boyd <earnie_boyd at yahoo dot com>]

Ralf Corsepius wrote:
> Am Mit, 2002-11-13 um 19.08 schrieb Earnie Boyd:
>
> > I need to add a library specific to a target_os.  I've tried several 
> > possible techniques and can't get cooperation from the tools.
> >
> > What I want is something similar to:
> >
> > target_os := @target_os@
> >
> > ifeq ($(target_os),mingw32)
> >   LDADD += -lws2_32
> > endif
> >
> >
> > Unfortunately automake thinks the conditional belongs to it instead of make.
> >
> > Help?
> 1. Ugly "You-don't-really-want to-apply-it"; brute-force approach:
>
> Add this to your configure.ac:
> AC_SUBST(ENDIF,endif)
> and use @ENDIF@ instead of endif inside of you Makefile.am
I may try this but

> 2. Check $host_* inside of your configure.ac and setup a conditional,
> eg. something along this example
> AM_CONDITIONAL(MINGW,test x"$host_os" == "mingw32")
> And apply @MINGW@ inside of your Makefile.am
this I had tried already.  However I had forgotten the last step. 
Trying again I have:

configure.in with
  AM_CONDITIONAL(WINDOWS, test x$target_os == xmingw32)

Makefile.am with
  WINDOWS = @WINDOWS@
  if WINDOWS
  LDADD += -lws2_32
  endif

But I can't tell if Makefile.in is correct totally.  It doesn't contain 
the `if WINDOWS' condition at all.  It does contain various WINDOWS 
generated parts based on what should happen with AM_CONDITIONAL.

> 3. Apply an autoconf-lib checks to determine when adding this lib is
> necessary.
I'm researching this.

> 4. Tell your users to use ./configure LIBS=-lws2_32 or similar
That I want to avoid.

Earnie.

P.S.: I'm using 1.7.1 of Automake and version 2.54 of Autoconf.