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From: "jan.kratochvil at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: dwz@sourceware.org
Subject: [Bug default/27572] New: Multifile drops
 DW_TAG_namespace::DW_AT_export_symbols
Date: Fri, 12 Mar 2021 17:13:34 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27572

            Bug ID: 27572
           Summary: Multifile drops DW_TAG_namespace::DW_AT_export_symbols
           Product: dwz
           Version: unspecified
            Status: NEW
          Severity: critical
          Priority: P2
         Component: default
          Assignee: nobody at sourceware dot org
          Reporter: jan.kratochvil at redhat dot com
                CC: dwz at sourceware dot org
  Target Milestone: ---

echo 'inline namespace A { enum E { X0,X1,X2,X3,X4,X5 }; } int main() { ret=
urn
X0; }'|g++ -Wall -g -x c++ -;cp -p a.out a.out.dup;dwz -m a.out.dwz a.out
a.out.dup;readelf -wi a.out.dwz|grep DW_AT_export_symbols

Actual:
(nothing)

Expected:
    <XX>   DW_AT_export_symbols: 1

Context:
a.out:
 <0><b>: Abbrev Number: 1 (DW_TAG_compile_unit)
...
 <1><22>: Abbrev Number: 5 (DW_TAG_imported_unit)
    <23>   DW_AT_import      : <alt 0xb>
 <1><27>: Abbrev Number: 4 (DW_TAG_namespace)
    <28>   DW_AT_name        : A
...
    <2d>   DW_AT_export_symbols: 1
 <2><2e>: Abbrev Number: 0

a.out.dwz:
 <0><b>: Abbrev Number: 4 (DW_TAG_partial_unit)
...
 <1><14>: Abbrev Number: 2 (DW_TAG_namespace)
    <15>   DW_AT_name        : A
...
 <2><18>: Abbrev Number: 6 (DW_TAG_enumeration_type)

This breaks libc++ which is using namespace 'std::__1::' -> 'std::'

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