output file setup

[Jeffrey A Law <law at cygnus dot com>]

Some of the changes in the C++ front-end in the mainline sources cause
the compiler to call assemble_variable/assemble_external during
init_decl_processing.

On the PA (and possibly other targets), assemble_external actually has to
write stuff to the output file.  Unfortunately, "asm_output_file" hasn't
been initialized at the time we call init_decl_processing.  Segfault.  Oops.

Anyway, this patch moves setting up the output file to an earlier point in
compile_file which solves the problem.

I'm installing this on the mainline sources.

	* toplev.c (compile_file): Set up the output file before we call
	the various initializers for the compiler.

Index: toplev.c
===================================================================
RCS file: /cvs/cvsfiles/devo/gcc/toplev.c,v
retrieving revision 1.437
diff -c -3 -p -r1.437 toplev.c
*** toplev.c	2001/04/30 22:37:17	1.437
--- toplev.c	2001/05/07 15:47:27
*************** compile_file (name)
*** 2263,2268 ****
--- 2263,2289 ----
    init_timevar ();
    timevar_start (TV_TOTAL);
  
+   if (! name_specified && asm_file_name == 0)
+     asm_out_file = stdout;
+   else
+     {
+       if (asm_file_name == 0)
+         {
+           int len = strlen (dump_base_name);
+           char *dumpname = (char *) xmalloc (len + 6);
+           memcpy (dumpname, dump_base_name, len + 1);
+           strip_off_ending (dumpname, len);
+           strcat (dumpname, ".s");
+           asm_file_name = dumpname;
+         }
+       if (!strcmp (asm_file_name, "-"))
+         asm_out_file = stdout;
+       else
+         asm_out_file = fopen (asm_file_name, "w");
+       if (asm_out_file == 0)
+ 	fatal_io_error ("can't open %s for writing", asm_file_name);
+     }
+ 
    /* Initialize data in various passes.  */
  
    init_obstacks ();
*************** compile_file (name)
*** 2322,2348 ****
    /* Open assembler code output file.  Do this even if -fsyntax-only is on,
       because then the driver will have provided the name of a temporary
       file or bit bucket for us.  */
- 
-   if (! name_specified && asm_file_name == 0)
-     asm_out_file = stdout;
-   else
-     {
-       if (asm_file_name == 0)
-         {
-           int len = strlen (dump_base_name);
-           char *dumpname = (char *) xmalloc (len + 6);
-           memcpy (dumpname, dump_base_name, len + 1);
-           strip_off_ending (dumpname, len);
-           strcat (dumpname, ".s");
-           asm_file_name = dumpname;
-         }
-       if (!strcmp (asm_file_name, "-"))
-         asm_out_file = stdout;
-       else
-         asm_out_file = fopen (asm_file_name, "w");
-       if (asm_out_file == 0)
- 	fatal_io_error ("can't open %s for writing", asm_file_name);
-     }
  
  #ifdef IO_BUFFER_SIZE
    setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
--- 2343,2348 ----