[PATCH RFA] mi/mi-main.c: Don't use variable-length array extension

[Kevin Buettner <kevinb@cygnus.com>]

These are probably obvious fixes, but I used alloca() which is
sometimes considered objectionable, so I decided to ask for approval. 
I'm willing to rework the patch to use xmalloc(), make_cleanup(), etc,
but it will be messier.

	* mi-main.c (register_changed_p, get_register): Use alloca()
	to allocate space previously allocated via gcc's
	variable-length array extension.

Index: mi/mi-main.c
===================================================================
RCS file: /cvs/src/src/gdb/mi/mi-main.c,v
retrieving revision 1.19
diff -u -p -r1.19 mi-main.c
--- mi-main.c	2001/06/25 21:05:11	1.19
+++ mi-main.c	2001/07/09 06:17:35
@@ -378,7 +378,7 @@ mi_cmd_data_list_changed_registers (char
 static int
 register_changed_p (int regnum)
 {
-  char raw_buffer[MAX_REGISTER_RAW_SIZE];
+  char *raw_buffer = alloca (MAX_REGISTER_RAW_SIZE);
 
   if (read_relative_register_raw_bytes (regnum, raw_buffer))
     return -1;
@@ -483,8 +483,8 @@ mi_cmd_data_list_register_values (char *
 static int
 get_register (int regnum, int format)
 {
-  char raw_buffer[MAX_REGISTER_RAW_SIZE];
-  char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
+  char *raw_buffer = alloca (MAX_REGISTER_RAW_SIZE);
+  char *virtual_buffer = alloca (MAX_REGISTER_VIRTUAL_SIZE);
   int optim;
   static struct ui_stream *stb = NULL;