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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/98373] New: [11 Repression] Bogus error: ‘symbuf’ may be used uninitialized at -O0
Date: Fri, 18 Dec 2020 13:16:14 +0000 [thread overview]
Message-ID: <bug-98373-4@http.gcc.gnu.org/bugzilla/> (raw)
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]$
next reply other threads:[~2020-12-18 13:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-18 13:16 hjl.tools at gmail dot com [this message]
2020-12-18 15:36 ` [Bug middle-end/98373] " msebor at gcc dot gnu.org
2020-12-18 21:55 ` hjl.tools at gmail dot com
2020-12-18 22:38 ` [Bug middle-end/98373] [11 Repression] Bogus error: ‘symbuf’ may be used uninitialized at -O0 by r11-959 hjl.tools at gmail dot com
2020-12-18 23:40 ` msebor at gcc dot gnu.org
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