[RFA-v2] testsuite: avoid compilation error on cygwin/mingw if -nostdlib option is used.

["Pierre Muller" <muller@ics.u-strasbg.fr>]

  Thanks Pedro for the feedback.

  Here is an updated version
Is this OK?

Pierre

2009-10-02  Pierre Muller  <muller@ics.u-strasbg.fr>
	    Pedro Alves  <pedro@codesourcery.com>

	* lib/gdb.exp (gdb_compile): Avoid adding 
	gdb_saved_unbuffered_mode_obj if -nostdlib option is used.


Index: lib/gdb.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/lib/gdb.exp,v
retrieving revision 1.119
diff -u -p -r1.119 gdb.exp
--- lib/gdb.exp	13 Jul 2009 19:24:18 -0000	1.119
+++ lib/gdb.exp	2 Oct 2009 07:08:40 -0000
@@ -1824,7 +1824,11 @@ proc gdb_compile {source dest type optio
 	    # reverse link order.  In that case, we can use ldflags to
 	    # avoid copying the object file to the host multiple
 	    # times.
-	    lappend options "ldflags=$gdb_saved_set_unbuffered_mode_obj"
+	    # This object can only be added if standard libraries are
+	    # used. Thus, we need to disable it if -nostdlib option is used
+	    if {[lsearch -regexp $options "-nostdlib"] < 0 } {
+		lappend options "ldflags=$gdb_saved_set_unbuffered_mode_obj"
+	    }
 	}
     }
 

> -----Message d'origine-----
> De : gdb-patches-owner@sourceware.org [mailto:gdb-patches-
> owner@sourceware.org] De la part de Pedro Alves
> Envoyé : Friday, October 02, 2009 1:30 AM
> À : gdb-patches@sourceware.org
> Cc : Pierre Muller
> Objet : Re: [RFA] testsuite: avoid compilation error on cygwin/mingw if
> -nostdlib option is used.
> 
> Seems reasonable.  This is okay, with nits below.
> 
> On Thursday 01 October 2009 23:36:12, Pierre Muller wrote:
> 
> > +	    set add_unbuffered_object 1;
> > +	    if {[lsearch -regexp $options ".*-nostdlib.*"] >= 0 } {
> > +		verbose "No set_unbuffered_mode for -nostdlib option";
> > +		set add_unbuffered_object 0;
> > +	    }
> 
> The ';' are unnecessary.  The '.*' are also unnecessary.
> 
> >  	    if { $gdb_saved_set_unbuffered_mode_obj == "" } {
> >  		verbose "compiling gdb_saved_set_unbuffered_obj"
> >  		set unbuf_src ${srcdir}/lib/set_unbuffered_mode.c
> > @@ -1824,7 +1881,9 @@ proc gdb_compile {source dest type optio
> >  	    # reverse link order.  In that case, we can use ldflags to
> >  	    # avoid copying the object file to the host multiple
> >  	    # times.
> > -	    lappend options "ldflags=$gdb_saved_set_unbuffered_mode_obj"
> > +	    if { $add_unbuffered_object == 1 } {
> 
> Works too:
> 
>     if { $add_unbuffered_object } {
> 
> Or, why not drop the extra variable, and just:
> 
>     if {[lsearch -regexp $options "-nostdlib"] < 0 } {
> 	lappend options "ldflags=$gdb_saved_set_unbuffered_mode_obj"
>     }
> 
> a suitable small comment would be nice too.
> 
> > +		lappend options
> "ldflags=$gdb_saved_set_unbuffered_mode_obj"
> > +	    }
> >  	}
> >      }
> 
> --
> Pedro Alves