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From: "maennich at android dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug default/26591] detect pathologically redundant types in abixml
Date: Wed, 01 Dec 2021 10:19:22 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26591

Matthias Maennich <maennich at android dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |maennich at android dot com

--- Comment #11 from Matthias Maennich <maennich at android dot com> ---
Hi Dodji,

We came across this as we were digging into an unrelated issue.

The duplicate types mentioned in comment 6 appear to correlate to
DW_AT_signature (part of DWARF 4 type units - see
https://dwarfstd.org/ShowIssue.php?issue=3D080930.1). The test files
that make use of this feature are:

tests/data/test-read-dwarf/test15-pr18892.so - GCC 4.9.2
tests/data/test-read-dwarf/libtest23.so - GCC 4.8.5
tests/data/test-read-dwarf/PR22122-libftdc.so - Clang 3.9.1

abidw gets incomplete type information as a result.

LLVM added support to LLDB's DWARF parser here:
https://reviews.llvm.org/D62246.

The feature doesn't currently appear in Android binaries (kernel or framewo=
rk
libraries).

Both GCC and Clang appear to require -fdebug-types-section to enable
this feature. At least it should be straightforward doing with /
without comparisons.

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