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From: "blarsen at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug macros/29063] New: Handle macinfo section and tags
Date: Wed, 13 Apr 2022 17:40:02 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29063

            Bug ID: 29063
           Summary: Handle macinfo section and tags
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: macros
          Assignee: unassigned at sourceware dot org
          Reporter: blarsen at redhat dot com
  Target Milestone: ---

The DWARF4 spec defined the .debug_macinfo section, which was replaced by t=
he
.debug_macro section by DWARF5, and a series of tags, such as:

* DW_MACINFO_define
* DW_MACINFO_undef
* DW_MACINFO_start_file
* DW_MACINFO_end_file
* DW_MACINFO_vendor_ext

and none of these are handled by GDB. The biggest problem with this is that
clang, by default, uses these DWARF4 style for macro debug information.

As an example to see the problem, trying gdb.base/macscp.exp using
RUNTESTFLAGS=3D"CC_FOR_TARGET=3Dclang" will show that GDB can't deal with t=
he
macros there, and complaints are very unhelpful.

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