add --with-tune configure flag

fixes a configure error on Arm64 when passing --with-tune=... to configure:
```
This target does not support --with-tune.
Valid --with options are: abi cpu arch
```
The missing flag sets target tuning to a different value than generic tuning.

gcc/
	* config.gcc: Add --with-tune to AArch64 configure flags.

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 15318b2..3e8bd76 100644 (file)
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -4083,9 +4083,8 @@ fi
 supported_defaults=
 case "${target}" in
        aarch64*-*-*)
-               supported_defaults="abi cpu arch"
-               for which in cpu arch; do
-
+               supported_defaults="abi cpu arch tune"
+               for which in cpu arch tune; do
                        eval "val=\$with_$which"
                        base_val=`echo $val | sed -e 's/\+.*//'`
                        ext_val=`echo $val | sed -e 's/[a-z0-9.-]\+//'`