[gcc r12-3477] Remove DARWIN_PREFER_DWARF and dead code

[Richard Biener <rguenth@gcc.gnu.org>]

https://gcc.gnu.org/g:c86de344f81f7a3368c2327477429c13a3746783

commit r12-3477-gc86de344f81f7a3368c2327477429c13a3746783
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Sep 10 09:17:00 2021 +0200

    Remove DARWIN_PREFER_DWARF and dead code
    
    This removes the always defined DARWIN_PREFER_DWARF and the code
    guarded by it being not defined, removing the possibility to
    default some i386 darwin configurations to STABS when it would
    not be defined.
    
    2021-09-10  Richard Biener  <rguenther@suse.de>
    
            * config/darwin.h (DARWIN_PREFER_DWARF): Do not define.
            * config/i386/darwin.h (PREFERRED_DEBUGGING_TYPE): Do not
            change based on DARWIN_PREFER_DWARF not being defined.

Diff:
---
 gcc/config/darwin.h      |  3 +--
 gcc/config/i386/darwin.h | 11 -----------
 2 files changed, 1 insertion(+), 13 deletions(-)

diff --git a/gcc/config/darwin.h b/gcc/config/darwin.h
index f1d92f87e9a..6396586c138 100644
--- a/gcc/config/darwin.h
+++ b/gcc/config/darwin.h
@@ -499,9 +499,8 @@ extern GTY(()) int darwin_ms_struct;
 /* We now require C++11 to bootstrap and newer tools than those based on
    stabs, so require DWARF-2, even if stabs is supported by the assembler.  */
 
-#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
-#define DARWIN_PREFER_DWARF
 #define DWARF2_DEBUGGING_INFO 1
+#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 
 #ifdef HAVE_AS_STABS_DIRECTIVE
 #define DBX_DEBUGGING_INFO 1
diff --git a/gcc/config/i386/darwin.h b/gcc/config/i386/darwin.h
index da0ae5b3ee7..c4a6f4dfda7 100644
--- a/gcc/config/i386/darwin.h
+++ b/gcc/config/i386/darwin.h
@@ -264,17 +264,6 @@ along with GCC; see the file COPYING3.  If not see
       target_flags &= ~MASK_MACHO_DYNAMIC_NO_PIC;			\
   } while (0)
 
-/* Darwin on x86_64 uses dwarf-2 by default.  Pre-darwin9 32-bit
-   compiles default to stabs+.  darwin9+ defaults to dwarf-2.  */
-#ifndef DARWIN_PREFER_DWARF
-#undef PREFERRED_DEBUGGING_TYPE
-#ifdef HAVE_AS_STABS_DIRECTIVE
-#define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG)
-#else
-#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
-#endif
-#endif
-
 /* Darwin uses the standard DWARF register numbers but the default
    register numbers for STABS.  Fortunately for 64-bit code the
    default and the standard are the same.  */