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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/102255] target uses STABS by default
Date: Thu, 09 Sep 2021 12:58:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102255

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|i[34567]86-*-cygwin*,       |i[34567]86-*-cygwin*,
                   |x86_64-*-cygwin*,           |x86_64-*-cygwin*,
                   |i[34567]86-*-mingw*,        |i[34567]86-*-mingw*,
                   |x86_64-*-mingw*             |x86_64-*-mingw*,
                   |                            |i?86-*-darwin*

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
i?86-*-darwin* also uses STABS for pre-darwin9 32bit compiles via i386/darw=
in.h

/* 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

but it looks like DARWIN_PREFER_DWARF is always set.=