(snarfcppopts): New var.

(.c.x): Use $(snarfcppopts). Rework guile-snarf usage.

srfi/Makefile.am

@@ -3,17 +3,17 @@
 ##   Copyright (C) 2001 Free Software Foundation, Inc.
 ##
 ##   This file is part of GUILE.
-##   
+##
 ##   GUILE is free software; you can redistribute it and/or modify
 ##   it under the terms of the GNU General Public License as
 ##   published by the Free Software Foundation; either version 2, or
 ##   (at your option) any later version.
-##   
+##
 ##   GUILE is distributed in the hope that it will be useful, but
 ##   WITHOUT ANY WARRANTY; without even the implied warranty of
 ##   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 ##   GNU General Public License for more details.
-##   
+##
 ##   You should have received a copy of the GNU General Public
 ##   License along with GUILE; see the file COPYING.  If not, write
 ##   to the Free Software Foundation, Inc., 59 Temple Place, Suite
@@ -66,9 +66,10 @@ GUILE_SNARF = ../libguile/guile-snarf
 
 MKDEP = gcc -M -MG $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS)
 
+snarfcppopts = $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS)
+
 SUFFIXES = .x
 .c.x:
-	$(GUILE_SNARF) $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS) $< > $@ \
-	|| { rm $@; false; }
+	$(GUILE_SNARF) $< $(snarfcppopts)
 
 CLEANFILES = *.x