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Patch to add new target macro: TARGET_WARN_RETURN_TYPE
- To: egcs-patches at cygnus dot com
- Subject: Patch to add new target macro: TARGET_WARN_RETURN_TYPE
- From: Nick Clifton <nickc at cygnus dot com>
- Date: Thu, 18 Mar 1999 16:30:20 -0800
Hi Guys,
I would like to get approval for the following patch. It adds a new
target macro called 'TARGET_WARN_RETURN_TYPE' which can be used to
disable the check for a non-void function returning without
providing a return value. This ability would be useful for the ARM
port which supports the notion of a "naked" function whoes prologue
and epilogue is left entirely up to the programmer to code.
Cheers
Nick
Thu Mar 18 16:10:11 1999 Nick Clifton <nickc@cygnus.com>
* c-decl.c (finish_function): Check TARGET_WARN_RETURN_TYPE
(if defined) before generating a warning message about a
non-void function not returning a value.
* tm.texi (TARGET_WARN_RETURN_TYPE): Docuemnt.
Index: c-decl.c
===================================================================
RCS file: /cvs/cvsfiles/devo/gcc/c-decl.c,v
retrieving revision 1.223
diff -p -r1.223 c-decl.c
*** c-decl.c 1999/01/15 07:57:14 1.223
- --- c-decl.c 1999/03/18 23:17:13
*************** finish_function (nested)
*** 7285,7290 ****
- --- 7285,7293 ----
if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
warning ("`noreturn' function does return");
else if (warn_return_type && can_reach_end
+ #ifdef TARGET_WARN_RETURN_TYPE
+ && TARGET_WARN_RETURN_TYPE
+ #endif
&& TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
/* If this function returns non-void and control can drop through,
complain. */
Index: tm.texi
===================================================================
RCS file: /cvs/cvsfiles/devo/gcc/tm.texi,v
retrieving revision 1.147
diff -p -r1.147 tm.texi
*** tm.texi 1999/03/17 20:27:45 1.147
- --- tm.texi 1999/03/18 23:17:34
*************** in the system math library, or @samp{""}
*** 7689,7692 ****
- --- 7689,7697 ----
separate math library.
You need only define this macro if the default of @samp{"-lm"} is wrong.
+
+ @findex TARGET_WARN_RETURN_TYPE
+ @item TARGET_WARN_RETURN_TYPE
+ Define this macro if you need to control the production of warning
+ messages about control reaching the end of a non-void function.
@end table