* [Bug default/27162] New: libabigail appears to lose declarations for common symbols
@ 2021-01-08 14:33 gprocida+abigail at google dot com
2021-01-08 14:34 ` [Bug default/27162] " gprocida+abigail at google dot com
2021-07-26 20:30 ` gprocida at google dot com
0 siblings, 2 replies; 3+ messages in thread
From: gprocida+abigail at google dot com @ 2021-01-08 14:33 UTC (permalink / raw)
To: libabigail
https://sourceware.org/bugzilla/show_bug.cgi?id=27162
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='bar.o' architecture='elf-amd-x86_64'>
<elf-variable-symbols>
<elf-symbol name='arg' size='8' type='object-type' binding='global-binding'
visibility='default-visibility' is-defined='yes'/>
</elf-variable-symbols>
<abi-instr version='1.0' address-size='64' path='bar.c' comp-dir-path='/tmp'
language='LANG_C99'>
<type-decl name='int' size-in-bits='32' id='type-id-1'/>
<array-type-def dimensions='1' type-id='type-id-1' size-in-bits='64'
id='type-id-2'>
<subrange length='2' type-id='type-id-3' id='type-id-4'/>
</array-type-def>
<type-decl name='unsigned long int' size-in-bits='64' id='type-id-3'/>
<var-decl name='arg' type-id='type-id-2' mangled-name='arg'
visibility='default' filepath='/tmp/bar.c' line='1' column='1'
elf-symbol-id='arg'/>
</abi-instr>
</abi-corpus>
$ gcc -fcommon -g -Wall -Wextra -c bar.c
$ ~/android/libabigail/build/tools/abidw bar.o
<abi-corpus path='bar.o' architecture='elf-amd-x86_64'>
<elf-variable-symbols>
<elf-symbol name='arg' size='8' type='object-type' binding='global-binding'
visibility='default-visibility' is-defined='yes' is-common='yes'/>
</elf-variable-symbols>
</abi-corpus>
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* [Bug default/27162] libabigail appears to lose declarations for common symbols
2021-01-08 14:33 [Bug default/27162] New: libabigail appears to lose declarations for common symbols gprocida+abigail at google dot com
@ 2021-01-08 14:34 ` gprocida+abigail at google dot com
2021-07-26 20:30 ` gprocida at google dot com
1 sibling, 0 replies; 3+ messages in thread
From: gprocida+abigail at google dot com @ 2021-01-08 14:34 UTC (permalink / raw)
To: libabigail
https://sourceware.org/bugzilla/show_bug.cgi?id=27162
--- Comment #1 from Giuliano Procida <gprocida+abigail at google dot com> ---
Note that -fcommon is the default for GCC 9 and earlier.
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* [Bug default/27162] libabigail appears to lose declarations for common symbols
2021-01-08 14:33 [Bug default/27162] New: libabigail appears to lose declarations for common symbols gprocida+abigail at google dot com
2021-01-08 14:34 ` [Bug default/27162] " gprocida+abigail at google dot com
@ 2021-07-26 20:30 ` gprocida at google dot com
1 sibling, 0 replies; 3+ messages in thread
From: gprocida at google dot com @ 2021-07-26 20:30 UTC (permalink / raw)
To: libabigail
https://sourceware.org/bugzilla/show_bug.cgi?id=27162
gprocida at google dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |gprocida at google dot com
--- Comment #2 from gprocida at google dot com ---
Still reproduces at head. The DWARF dumps are virtually identical between
-fcommon and -fno-common so I suspect the issue is more with the symbol table
or symbol lookup side of things.
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2021-01-08 14:33 [Bug default/27162] New: libabigail appears to lose declarations for common symbols gprocida+abigail at google dot com
2021-01-08 14:34 ` [Bug default/27162] " gprocida+abigail at google dot com
2021-07-26 20:30 ` gprocida at google dot com
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