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From: "Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Date: Fri, 11 Dec 2020 00:39:32 +0300
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Subject: Re: Difficulties compiling libc from repository using gcc 10.N.0
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On 12/10/20, Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via
djgpp AT delorie DOT com] <djgpp AT delorie DOT com> wrote:
> d:/djgpp/include/io.h: In function '_chmod':
> _chmod.c:28:14: warning: array subscript 1 is outside array bounds of
> 'int[1]' [-Warray-bounds]
>     28 |     r.x.cx = *(&func + 1);  /* Value to set */
>        |              ^~~~~~~~~~~~
> _chmod.c:14:34: note: while referencing 'func'
>     14 | _chmod(const char *filename, int func, ...)
>        |                              ~~~~^~~~
>
> The -Warray-bounds appears quite a lot due to our way to address
> neighborhood variables as can
> be seen in the example above.  May be some with some spare time can fix
> these occurencies.

As far as I can see, this particular case is intending this
using a nasty shortcut?

--- _chmod.c~
+++ _chmod.c
@@ -9,7 +9,8 @@
 #include <dpmi.h>
 #include <fcntl.h>
 #include <libc/dosio.h>
-
+#include <stdarg.h>
+
 int
 _chmod(const char *filename, int func, ...)
 {
@@ -25,7 +26,12 @@ _chmod(const char *filename, int func, .
     r.x.ax = 0x4300 + func;
   _put_path(filename);
   if (func == 1)
-    r.x.cx = *(&func + 1);		/* Value to set */
+  {
+    va_list ap;
+    va_start (ap, func);
+    r.x.cx = va_arg(ap, int);		/* Value to set */
+    va_end (ap);
+  }
   r.x.dx = __tb_offset;
   r.x.ds = __tb_segment;
   __dpmi_int(0x21, &r);

Correct?  Any others like this?