[Bug debug/98755] New: [11 regression] r11-6755 causes failure in g++.dg/debug/dwarf2/constexpr-var-1.C

[Bug debug/98755] New: [11 regression] r11-6755 causes failure in g++.dg/debug/dwarf2/constexpr-var-1.C

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98755

            Bug ID: 98755
           Summary: [11 regression] r11-6755 causes failure in
                    g++.dg/debug/dwarf2/constexpr-var-1.C
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at gcc dot gnu.org
  Target Milestone: ---

g:3804e937b0e252a7e42632fe6d9f898f1851a49c, r11-6755
make  -k check-gcc
RUNTESTFLAGS="dwarf2.exp=g++.dg/debug/dwarf2/constexpr-var-1.C"
FAIL: g++.dg/debug/dwarf2/constexpr-var-1.C   scan-assembler-times 
DW_AT_const_expr 2
# of expected passes            1
# of unexpected failures        1

commit 3804e937b0e252a7e42632fe6d9f898f1851a49c (HEAD, refs/bisect/bad)
Author: Mark Wielaard <mark@klomp.org>
Date:   Tue Sep 29 15:52:44 2020 +0200

    Default to DWARF5

    gcc/ChangeLog:

            * common.opt (gdwarf-): Init(5).
            * doc/invoke.texi (-gdwarf): Document default to 5.

[Bug debug/98755] [11 regression] r11-6755 causes failure in g++.dg/debug/dwarf2/constexpr-var-1.C

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98755

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1
   Target Milestone|---                         |11.0

[Bug debug/98755] [11 regression] r11-6755 causes failure in g++.dg/debug/dwarf2/constexpr-var-1.C

[mark at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98755

Mark Wielaard <mark at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Build|powerpc64*-linux-gnu        |
             Target|powerpc64*-linux-gnu        |
               Host|powerpc64*-linux-gnu        |
                 CC|                            |jakub at redhat dot com,
                   |                            |jason at redhat dot com,
                   |                            |law at gcc dot gnu.org

--- Comment #1 from Mark Wielaard <mark at gcc dot gnu.org> ---
This isn't ppc64 specific and was also reported in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98728

> This is https://gcc.gnu.org/pipermail/gcc-patches/2020-August/552474.html
> There is a suggested fix, but no consensus on whether that is a good one:
> https://gcc.gnu.org/pipermail/gcc-patches/2020-September/553102.html

[Bug debug/98755] [11 regression] r11-6755 causes failure in g++.dg/debug/dwarf2/constexpr-var-1.C

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98755

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

https://gcc.gnu.org/g:e1782d8ad10dc6b556e118fd25fdaff04ce54dde

commit r11-7162-ge1782d8ad10dc6b556e118fd25fdaff04ce54dde
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Feb 10 07:54:30 2021 +0100

    dwarf2out: Don't prune static data members initialized with constants with
-gdwarf-5 [PR98755]

    In DWARF4 and earlier, static data members were represented as
DW_TAG_member and the
    pruning code wouldn't prune those, but in DWARF5 they are represented as
DW_TAG_variable
    with the class parent and the pruning code prunes those by default unless
they are
    referenced from a separate definition without the class parent (out of
class definition).
    C++17 inline vars have the definitions in the class though and even before
if the static
    data member isn't ODR used, it doesn't need to be defined, so we could just
never describe
    those static data members in the debug info.

    This change stops the pruning of DW_TAG_variable with DW_AT_const_value
attribute
    with a class parent for -gdwarf-5 and later.

    This fixes
    -FAIL: g++.dg/debug/dwarf2/constexpr-var-1.C   scan-assembler-times 
DW_AT_const_expr 2
    -FAIL: libstdc++-prettyprinters/80276.cc whatis p4
    -FAIL: libstdc++-prettyprinters/80276.cc whatis p4
    -FAIL: libstdc++-prettyprinters/libfundts.cc print as
    -FAIL: libstdc++-prettyprinters/libfundts.cc print as
    -FAIL: libstdc++-prettyprinters/libfundts.cc print os
    -FAIL: libstdc++-prettyprinters/libfundts.cc print os

    2021-02-10  Jakub Jelinek  <jakub@redhat.com>

            PR debug/98755
            * dwarf2out.c (prune_unused_types_walk): Mark DW_TAG_variable DIEs
            at class scope for DWARF5+.

[Bug debug/98755] [11 regression] r11-6755 causes failure in g++.dg/debug/dwarf2/constexpr-var-1.C

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98755

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.