configure: gate our use of GDB to 8.3.1 or above

The support of socket based debugging which we need for linux-user
testing is only really stable as of 8.3.1 so lets gate our use of GDB
on having a relatively modern version.

For direct testing you can just point to a locally compiled version of
gdb via configure, e.g.:

  ../../configure --gdb=$HOME/src/binutils-gdb.git/builds/all/install/bin/gdb

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20210108224256.2321-4-alex.bennee@linaro.org>

diff --git a/configure b/configure
index 155dda1..9f016b0 100755 (executable)
--- a/configure
+++ b/configure
@@ -6166,8 +6166,11 @@ if test "$plugins" = "yes" ; then
     fi
 fi
 
-if test -n "$gdb_bin" ; then
-    echo "HAVE_GDB_BIN=$gdb_bin" >> $config_host_mak
+if test -n "$gdb_bin"; then
+    gdb_version=$($gdb_bin --version | head -n 1)
+    if version_ge ${gdb_version##* } 8.3.1; then
+        echo "HAVE_GDB_BIN=$gdb_bin" >> $config_host_mak
+    fi
 fi
 
 if test "$secret_keyring" = "yes" ; then