[Bug debug/95096] New: Feature request: add -fsplit-dwarf

[Bug debug/95096] New: Feature request: add -fsplit-dwarf

[i at maskray dot me]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95096

            Bug ID: 95096
           Summary: Feature request: add -fsplit-dwarf
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: i at maskray dot me
  Target Milestone: ---

-gsplit-dwarf has an undesired property: it sets the debug info level to 2.
When plugged into a build system, this can enable debug info unnecessarily
(when the user does not specify -g or specifies -g0).

-fsplit-dwarf can enable .dwo, but do not enable debug info by itself.

Its reaction with -g1 may need some thoughts: whether line tables in .dwo will
be beneficial. As a start, we can add the option first, which should be simple
(for a beginner like me:/ )

[Bug debug/95096] Feature request: add -fsplit-dwarf

[i at maskray dot me]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95096

--- Comment #1 from Fangrui Song <i at maskray dot me> ---
Created https://sourceware.org/pipermail/gcc-patches/2020-May/545638.html

[Bug debug/95096] Feature request: add -fsplit-dwarf

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95096

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:c8d3f2b6d1d81535ac3b71fd8dd1def12f8d03b3

commit r11-2407-gc8d3f2b6d1d81535ac3b71fd8dd1def12f8d03b3
Author: Fangrui Song <maskray@google.com>
Date:   Wed May 13 08:27:29 2020 -0700

    Don't make -gsplit-dwarf imply -g

    -gsplit-dwarf introduces order dependency: it overrides previous -g0 and
-g1.

    Don't imply -g so that it can be plugged into a build without worrying
    that unnecessary debugging information may be generated.

    2020-05-13  Fangrui Song  <maskray@google.com>

            PR debug/95096
            * opts.c (common_handle_option): Don't make -gsplit-dwarf imply -g.
            * doc/invoke.texi (-gsplit-dwarf): Update documentation.

[Bug debug/95096] Feature request: add -fsplit-dwarf

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95096

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|UNCONFIRMED                 |RESOLVED
      Known to work|                            |11.0

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed in different ways.