Add minimum version check for Sun compilers on solaris (WS6U2)

Bug #177486 r=roland.mainz@informatik.med.uni-giessen.de

configure.in

@@ -1394,6 +1394,24 @@ dnl the qsort routine under solaris is faulty
        AS='/usr/ccs/bin/as'
        ASFLAGS="$ASFLAGS -K PIC -L -P -D_ASM -D__STDC__=0"
        AS_DASH_C_FLAG=''
+        CC_VERSION=`$CC -V 2>&1 | grep ^cc: 2>/dev/null | $AWK -F\: '{ print $2 }'`
+        CXX_VERSION=`$CXX -V 2>&1 | grep ^CC: 2>/dev/null | $AWK -F\: '{ print $2 }'`
+        _MAJOR_VERSION_NUMBER=`echo $CC_VERSION | $AWK '{ print $3 }'`
+        _BAD_COMPILER=
+        if test $_MAJOR_VERSION_NUMBER -lt 6; then
+            _BAD_COMPILER=1
+        elif test $_MAJOR_VERSION_NUMBER -eq 6; then
+            _TMP1=`echo $CC_VERSION | sed 's|^Sun WorkShop||' | $AWK '{ print $2 }'`
+            _TMP2=`echo $CC_VERSION | sed 's|^Sun WorkShop||' | $AWK '{ print $2 }'`
+            if test "`echo $_TMP1 | grep -i -c update 2>/dev/null`"; then
+                if test $_TMP2 -lt 2; then
+                    _BAD_COMPILER=1
+                fi
+            fi
+        fi
+        if test -n "$_BAD_COMPILER"; then
+            AC_MSG_ERROR([Forte version WS6U2 or higher is required to build. Your compiler version is $CC_VERSION .])
+        fi
     else
        ASFLAGS="$ASFLAGS -fPIC"
        DSO_LDOPTS='-G -h $@'