Fix --with-tune option

Similiar reason to --with-cmodel.

Signed-off-by: demin.han <[email protected]>

Author: demin-han

configure

@@ -3999,16 +3999,23 @@ fi
 # Check whether --with-tune was given.
 if test ${with_tune+y}
 then :
-  withval=$with_tune; WITH_TUNE=--with-tune=$with_tune
+  withval=$with_tune;
+else $as_nop
+  with_tune=no
+
+fi
+
+
+if test "x$with_tune" != xno
+then :
+  WITH_TUNE=--with-tune=$with_tune
 
 else $as_nop
   WITH_TUNE=""
 
-
 fi
 
 
-
 # Check whether --with-isa-spec was given.
 if test ${with_isa_spec+y}
 then :

configure.ac

@@ -81,10 +81,14 @@ AC_ARG_WITH(abi,
 AC_ARG_WITH(tune,
 	[AS_HELP_STRING([--with-tune=generic],
 		[Set the base RISC-V CPU, defaults to GCC's default])],
-	[AC_SUBST(WITH_TUNE,--with-tune=$with_tune)],
-	[AC_SUBST(WITH_TUNE,"")]
+	[],
+	[with_tune=no]
 	)
 
+AS_IF([test "x$with_tune" != xno],
+	[AC_SUBST(WITH_TUNE,--with-tune=$with_tune)],
+	[AC_SUBST(WITH_TUNE,"")])
+
 AC_ARG_WITH(isa-spec,
 	[AS_HELP_STRING([--with-isa-spec=20191213],
 		[Set the default ISA spec version, default to 20191213, available options: 2.2, 20190608, 20191213])],