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From: "gprocida+abigail at google dot com" <sourceware-bugzilla@sourceware.org>
To: libabigail@sourceware.org
Subject: [Bug default/27162] New: libabigail appears to lose declarations for
 common symbols
Date: Fri, 08 Jan 2021 14:33:35 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27162

            Bug ID: 27162
           Summary: libabigail appears to lose declarations for common
                    symbols
           Product: libabigail
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: default
          Assignee: dodji at redhat dot com
          Reporter: gprocida+abigail at google dot com
                CC: libabigail at sourceware dot org
  Target Milestone: ---

libabigail appears to lose declarations for common symbols.

$ cat bar.c
int arg[2];
$ gcc -fno-common -g -Wall -Wextra -c bar.c
$ ~/android/libabigail/build/tools/abidw bar.o
<abi-corpus path=3D'bar.o' architecture=3D'elf-amd-x86_64'>
  <elf-variable-symbols>
    <elf-symbol name=3D'arg' size=3D'8' type=3D'object-type' binding=3D'glo=
bal-binding'
visibility=3D'default-visibility' is-defined=3D'yes'/>
  </elf-variable-symbols>
  <abi-instr version=3D'1.0' address-size=3D'64' path=3D'bar.c' comp-dir-pa=
th=3D'/tmp'
language=3D'LANG_C99'>
    <type-decl name=3D'int' size-in-bits=3D'32' id=3D'type-id-1'/>
    <array-type-def dimensions=3D'1' type-id=3D'type-id-1' size-in-bits=3D'=
64'
id=3D'type-id-2'>
      <subrange length=3D'2' type-id=3D'type-id-3' id=3D'type-id-4'/>
    </array-type-def>
    <type-decl name=3D'unsigned long int' size-in-bits=3D'64' id=3D'type-id=
-3'/>
    <var-decl name=3D'arg' type-id=3D'type-id-2' mangled-name=3D'arg'
visibility=3D'default' filepath=3D'/tmp/bar.c' line=3D'1' column=3D'1'
elf-symbol-id=3D'arg'/>
  </abi-instr>
</abi-corpus>
$ gcc -fcommon -g -Wall -Wextra -c bar.c
$ ~/android/libabigail/build/tools/abidw bar.o
<abi-corpus path=3D'bar.o' architecture=3D'elf-amd-x86_64'>
  <elf-variable-symbols>
    <elf-symbol name=3D'arg' size=3D'8' type=3D'object-type' binding=3D'glo=
bal-binding'
visibility=3D'default-visibility' is-defined=3D'yes' is-common=3D'yes'/>
  </elf-variable-symbols>
</abi-corpus>

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