Remove dbx.h, do not set PREFERRED_DEBUGGING_TYPE from dbxcoff.h, lynx.h

The following removes the unused config/dbx.h file and removes the
setting of PREFERRED_DEBUGGING_TYPE from dbxcoff.h which is
overridden by all users (djgpp/mingw/cygwin) via either including
config/i386/djgpp.h or config/i386/cygming.h

There are still circumstances where mingw and cygwin default to
STABS, namely when HAVE_GAS_PE_SECREL32_RELOC is not defined and
the target defaults to 32bit code generation.

The new style handling DBX_DEBUGGING_INFO is in line with
dbxelf.h which does not define PREFERRED_DEBUGGING_TYPE either.

The patch also removes the PREFERRED_DEBUGGING_TYPE define from
lynx.h which always follows elfos.h already defaulting to DWARF,
so the comment about STABS being the default is misleading and
outdated.

2021-09-09  Richard Biener  <rguenther@suse.de>

	PR target/102255
	* config/dbx.h: Remove.
	* config/dbxcoff.h: Do not define PREFERRED_DEBUGGING_TYPE.
	* config/lynx.h: Likewise.

3 files changed, 0 insertions, 45 deletions

diff --git a/gcc/config/dbx.h b/gcc/config/dbx.h
deleted file mode 100644
index b270a07..0000000
--- a/gcc/config/dbx.h
+++ /dev/null
@@ -1,32 +0,0 @@
-/* Prefer DBX (stabs) debugging information.
-   Copyright (C) 1996-2021 Free Software Foundation, Inc.
-
-This file is part of GCC.
-
-GCC is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 3, or (at your option)
-any later version.
-
-GCC is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-Under Section 7 of GPL version 3, you are granted additional
-permissions described in the GCC Runtime Library Exception, version
-3.1, as published by the Free Software Foundation.
-
-You should have received a copy of the GNU General Public License and
-a copy of the GCC Runtime Library Exception along with this program;
-see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
-<http://www.gnu.org/licenses/>.  */
-
-/* This file causes gcc to prefer using DBX (stabs) debugging
-   information.  The configure script will add a #include of this file
-   to tm.h when --with-stabs is used for certain targets.  */
-
-#define DBX_DEBUGGING_INFO 1
-
-#undef PREFERRED_DEBUGGING_TYPE
-#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
diff --git a/gcc/config/dbxcoff.h b/gcc/config/dbxcoff.h
index d491cff..bd705f9 100644
--- a/gcc/config/dbxcoff.h
+++ b/gcc/config/dbxcoff.h
@@ -25,12 +25,6 @@ along with GCC; see the file COPYING3.  If not see
 
 #define DBX_DEBUGGING_INFO 1
 
-/* Generate DBX debugging information by default.  */
-
-#ifndef PREFERRED_DEBUGGING_TYPE
-#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
-#endif
-
 /* Be function-relative for block and source line stab directives.  */
 
 #define DBX_BLOCKS_FUNCTION_RELATIVE 1
diff --git a/gcc/config/lynx.h b/gcc/config/lynx.h
index 020cc97..1438704 100644
--- a/gcc/config/lynx.h
+++ b/gcc/config/lynx.h
@@ -158,13 +158,6 @@ along with GCC; see the file COPYING3.  If not see
   while (0)
 #endif
 
-/* Keep the *_DEBUGGING_INFO defines from elfos.h except that stabs is
-   the default on LynxOS.  */
-
-#ifndef PREFERRED_DEBUGGING_TYPE
-# define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
-#endif
-
 #ifndef TARGET_POSIX_IO
 # define TARGET_POSIX_IO
 #endif