@@ -12095,6 +12095,13 @@ fold_builtin_next_arg (tree exp, bool va_start_p)
tree fntype = TREE_TYPE (current_function_decl);
int nargs = call_expr_nargs (exp);
tree arg;
+ /* There is good chance the current input_location points inside the
+ definition of the va_start macro (perhaps on the token for
+ builtin) in a system header, so warnings will not be emitted.
+ Use the location in real source code. */
+ source_location current_location =
+ linemap_unwind_to_first_non_reserved_loc (line_table, input_location,
+ NULL);
if (!stdarg_p (fntype))
{
@@ -12119,7 +12126,9 @@ fold_builtin_next_arg (tree exp, bool va_start_p)
{
/* Evidently an out of date version of <stdarg.h>; can't validate
va_start's second argument, but can still work as intended. */
- warning (0, "%<__builtin_next_arg%> called without an argument");
+ warning_at (current_location,
+ 0,
+ "%<__builtin_next_arg%> called without an argument");
return true;
}
else if (nargs > 1)
@@ -12154,7 +12163,9 @@ fold_builtin_next_arg (tree exp, bool va_start_p)
argument. We just warn and set the arg to be the last
argument so that we will get wrong-code because of
it. */
- warning (0, "second parameter of %<va_start%> not last named argument");
+ warning_at (current_location,
+ 0,
+ "second parameter of %<va_start%> not last named argument");
}
/* Undefined by C99 7.15.1.4p4 (va_start):
@@ -12164,8 +12175,12 @@ fold_builtin_next_arg (tree exp, bool va_start_p)
the default argument promotions, the behavior is undefined."
*/
else if (DECL_REGISTER (arg))
- warning (0, "undefined behaviour when second parameter of "
- "%<va_start%> is declared with %<register%> storage");
+ {
+ warning_at (current_location,
+ 0,
+ "undefined behaviour when second parameter of "
+ "%<va_start%> is declared with %<register%> storage");
+ }
/* We want to verify the second parameter just once before the tree
optimizers are run and then avoid keeping it in the tree,