Add version check for GCC

Mesa now requires GCC 3.3.0 or later.  See the following thread from
the mesa3d-dev mailing list for more details:

http://marc.info/?t=126748568900005&r=1&w=2

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>

diff --git a/configure.ac b/configure.ac
index e807d4acaf836e6ba69bf37cd13bd09482c1b125..8ca274932cc7cb6fab9702fbc258784a03446dae 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -46,6 +46,28 @@ solaris*)
     ;;
 esac
 
+dnl If we're using GCC, make sure that it is at least version 3.3.0.  Older
+dnl versions are explictly not supported.
+if test "x$GCC" = xyes; then
+    AC_MSG_CHECKING([whether gcc version is sufficient])
+    major=0
+    minor=0
+
+    GCC_VERSION=`$CC -dumpversion`
+    if test $? -eq 0; then
+        major=`echo $GCC_VERSION | cut -d. -f1`
+        minor=`echo $GCC_VERSION | cut -d. -f1`
+    fi
+
+    if test $major -lt 3 -o $major -eq 3 -a $minor -lt 3 ; then
+        AC_MSG_RESULT([no])
+        AC_MSG_ERROR([If using GCC, version 3.3.0 or later is required.])
+    else
+        AC_MSG_RESULT([yes])
+    fi
+fi
+
+
 MKDEP_OPTIONS=-fdepend
 dnl Ask gcc where it's keeping its secret headers
 if test "x$GCC" = xyes; then