Fix go configuration and SWIG_GCC_VERSION

- in configure.ac: modify sed expression to only look at first line of
  gccgo --version, extract the last numeric token, and remove periods;
  this parses e.g. "gccgo (Debian 4.7.2-5) 4.7.2"
- in goruntime.swg: fix typo in __GNUC_PATCHLEVEL__ (SF Bug #1298)

CHANGES.current

@@ -8,6 +8,10 @@ Version 3.0.1 (in progress)
 2014-05-01: olly
 	    [PHP] The generated __isset() method now returns true for read-only properties.
 
+2014-04-24: kwwette
+            [Go] Fix go ./configure parsing of gccgo --version, and
+            goruntime.swg typo in __GNUC_PATCHLEVEL__ (SF Bug #1298)
+
 2014-04-24: kwwette
             Fix {python|perl5|ruby|tcl}/java examples
 

Lib/go/goruntime.swg

@@ -116,7 +116,7 @@ extern void _cgo_panic(const char *);
    file is the same as the version of gccgo.  */
 
 #define SWIG_GCC_VERSION \
-  (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC__PATH_LEVEL__)
+  (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
 
 #if SWIG_GCC_VERSION < 40700
 #define SwigDoCgocall()

configure.ac

@@ -2266,9 +2266,13 @@ else
       GOGCC=true
       GOVERSIONOPTION=--version
       AC_MSG_CHECKING([whether gccgo version is too old])
-      go_version=`$GO $GOVERSIONOPTION | sed -e 's/[^0-9]* \([0-9.]*\) .*$/\1/' -e 's/[.]//g'`
+      go_version=[`$GO $GOVERSIONOPTION | sed -n '1p' | sed -e 's/^.* \([0-9.]*\) *$/\1/' -e 's/[.]//g'`]
-      if test "$go_version" -lt 470; then
+      if test "x$go_version" = x; then
+        AC_MSG_RESULT([could not determine gccgo version - disabling Go])
+        GO=
+      elif test "$go_version" -lt 470; then
         AC_MSG_RESULT([yes - minimum version is 4.7.0])
+        GO=
       else
 	AC_MSG_RESULT([no])
         if test "$go_version" -lt 480; then