https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98373
Bug ID: 98373
Summary: [11 Repression] Bogus error: ‘symbuf’ may be used
uninitialized at -O0
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
Created attachment 49795
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49795&action=edit
A testcase
[hjl@gnu-cfl-2 gold]$ /usr/gcc-11.0.0-x32/bin/g++ -S /tmp/plugin.ii -W -Wall
/export/linux/src/binutils/binutils/gold/plugin.cc: In member function ‘void
gold::Sized_pluginobj<size, big_endian>::do_add_symbols(gold::Symbol_table*,
gold::Read_symbols_data*, gold::Layout*) [with int size = 32; bool big_endian =
false]’:
/export/linux/src/binutils/binutils/gold/plugin.cc:1400:33: warning: ‘symbuf’
may be used uninitialized [-Wmaybe-uninitialized]
1400 | elfcpp::Sym<size, big_endian> sym(symbuf);
| ^~~
In file included from /export/linux/src/binutils/binutils/gold/script.h:37,
from /export/linux/src/binutils/binutils/gold/layout.h:33,
from /export/linux/src/binutils/binutils/gold/plugin.cc:73:
/export/linux/src/binutils/binutils/gold/../elfcpp/elfcpp.h:1532:3: note: by
argument 2 of type ‘const unsigned char*’ to ‘elfcpp::Sym<size,
big_endian>::Sym(const unsigned char*) [with int size = 32; bool big_endian =
false]’ declared here
1532 | Sym(const unsigned char* p)
| ^~~
/export/linux/src/binutils/binutils/gold/plugin.cc:1399:17: note: ‘symbuf’
declared here
1399 | unsigned char symbuf[sym_size];
| ^~~~~~
/export/linux/src/binutils/binutils/gold/plugin.cc: In member function ‘void
gold::Sized_pluginobj<size, big_endian>::do_add_symbols(gold::Symbol_table*,
gold::Read_symbols_data*, gold::Layout*) [with int size = 64; bool big_endian =
false]’:
/export/linux/src/binutils/binutils/gold/plugin.cc:1400:33: warning: ‘symbuf’
may be used uninitialized [-Wmaybe-uninitialized]
1400 | elfcpp::Sym<size, big_endian> sym(symbuf);
| ^~~
In file included from /export/linux/src/binutils/binutils/gold/script.h:37,
from /export/linux/src/binutils/binutils/gold/layout.h:33,
from /export/linux/src/binutils/binutils/gold/plugin.cc:73:
/export/linux/src/binutils/binutils/gold/../elfcpp/elfcpp.h:1532:3: note: by
argument 2 of type ‘const unsigned char*’ to ‘elfcpp::Sym<size,
big_endian>::Sym(const unsigned char*) [with int size = 64; bool big_endian =
false]’ declared here
1532 | Sym(const unsigned char* p)
| ^~~
/export/linux/src/binutils/binutils/gold/plugin.cc:1399:17: note: ‘symbuf’
declared here
1399 | unsigned char symbuf[sym_size];
| ^~~~~~
[hjl@gnu-cfl-2 gold]$ /usr/gcc-11.0.0-x32/bin/g++ -S /tmp/plugin.ii -W -Wall
-O2
[hjl@gnu-cfl-2 gold]$
