fixup! Use "default" instead of "rocket" for a default mtune

Use --with-tune="" instead of --with-tune=default for a default
mtune. Value "default" must not be used for this option.

Signed-off-by: Yuriy Kolerov <[email protected]>

Author: kolerov

configure

@@ -1421,7 +1421,7 @@ Optional Packages:
                           Sets the vendor part of the triplet alias
   --with-arch=rv64gc      Sets the base RISC-V ISA, defaults to rv64gc
   --with-abi=lp64d        Sets the base RISC-V ABI, defaults to lp64d
-  --with-tune=default     Set the base RISC-V CPU, defaults to rocket
+  --with-tune=rocket      Set the base RISC-V CPU, defaults to rocket
   --with-isa-spec=20191213
                           Set the default ISA spec version, default to
                           20191213, available options: 2.2, 20190608, 20191213
@@ -4103,7 +4103,7 @@ if test ${with_tune+y}
 then :
   withval=$with_tune;
 else $as_nop
-  with_tune=default
+  with_tune=
 
 fi
 

configure.ac

@@ -130,10 +130,10 @@ AC_ARG_WITH(abi,
 	)
 
 AC_ARG_WITH(tune,
-	[AS_HELP_STRING([--with-tune=default],
+	[AS_HELP_STRING([--with-tune=rocket],
 		[Set the base RISC-V CPU, defaults to rocket])],
 	[],
-	[with_tune=default]
+	[with_tune=]
 	)
 
 AC_ARG_WITH(isa-spec,