[patch] add --with-expat configure option

[Daniel Jacobowitz]

On Fri, Apr 13, 2007 at 09:31:59PM -0300, Thiago Jung Bauermann wrote:
> Hi,
> 
> I needed to disable compiling with the expat library even if present in
> the build system, so I created a --with-expat configure option to
> control that. Configuring with --with-expat=no or --without-expat will
> disable the expat test. The default is to use the library if available.
> 
> I'm posting here in case you are interested in incorporating the
> change...

Thanks.  I decided to check in this version instead; it makes missing
expat a fatal error if --with-expat is given.  This is useful for
people who do automated builds and expect them to have consistent
features.

-- 
Daniel Jacobowitz
CodeSourcery

2007-09-03  Daniel Jacobowitz  <dan@codesourcery.com>

	* configure.ac: Add --with-expat.
	* configure: Regenerated.

Index: configure.ac
===================================================================
RCS file: /cvs/src/src/gdb/configure.ac,v
retrieving revision 1.50
diff -u -p -r1.50 configure.ac
--- configure.ac	3 Sep 2007 19:00:16 -0000	1.50
+++ configure.ac	3 Sep 2007 20:44:18 -0000
@@ -352,15 +352,30 @@ AC_SUBST(READLINE)
 AC_SUBST(READLINE_DEPS)
 AC_SUBST(READLINE_CFLAGS)
 
-AC_LIB_HAVE_LINKFLAGS([expat], [], [#include "expat.h"],
-		      [XML_Parser p = XML_ParserCreate (0);])
-if test "$HAVE_LIBEXPAT" != yes; then
-  AC_MSG_WARN([expat is missing or unusable; some features may be disabled.])
+AC_ARG_WITH(expat,
+  AS_HELP_STRING([--with-expat], [include expat support (auto/yes/no)]),
+  [], [with_expat=auto])
+AC_MSG_CHECKING([whether to use expat])
+AC_MSG_RESULT([$with_expat])
+
+if test "${with_expat}" = no; then
+  AC_MSG_WARN([expat support disabled; some features may be unavailable.])
+  HAVE_LIBEXPAT=no
 else
-  save_LIBS=$LIBS
-  LIBS="$LIBS $LIBEXPAT"
-  AC_CHECK_FUNCS(XML_StopParser)
-  LIBS=$save_LIBS
+  AC_LIB_HAVE_LINKFLAGS([expat], [], [#include "expat.h"],
+			[XML_Parser p = XML_ParserCreate (0);])
+  if test "$HAVE_LIBEXPAT" != yes; then
+    if test "$with_expat" = yes; then
+      AC_MSG_ERROR([expat is missing or unusable])
+    else
+      AC_MSG_WARN([expat is missing or unusable; some features may be unavailable.])
+    fi
+  else
+    save_LIBS=$LIBS
+    LIBS="$LIBS $LIBEXPAT"
+    AC_CHECK_FUNCS(XML_StopParser)
+    LIBS=$save_LIBS
+  fi
 fi
 
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