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* [Bug c++/65009] New: g++ 4.9 sometimes leaves inline methods undefined when compiling with -Os
@ 2015-02-10 23:23 truckman at FreeBSD dot org
2015-02-11 0:11 ` [Bug c++/65009] " truckman at FreeBSD dot org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: truckman at FreeBSD dot org @ 2015-02-10 23:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65009
Bug ID: 65009
Summary: g++ 4.9 sometimes leaves inline methods undefined when
compiling with -Os
Product: gcc
Version: 4.9.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: truckman at FreeBSD dot org
# g++49 -v
Using built-in specs.
COLLECT_GCC=g++49
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc49/gcc/i386-portbld-freebsd8.4/4.9.3/lto-wrapper
Target: i386-portbld-freebsd8.4
Configured with: ./../gcc-4.9-20150204/configure
--with-build-config=bootstrap-debug --disable-nls
--enable-gnu-indirect-function --libdir=/usr/local/lib/gcc49
--libexecdir=/usr/local/libexec/gcc49 --program-suffix=49
--with-as=/usr/local/bin/as --with-gmp=/usr/local
--with-gxx-include-dir=/usr/local/lib/gcc49/include/c++/
--with-ld=/usr/local/bin/ld --with-libiconv-prefix=/usr/local
--with-pkgversion='FreeBSD Ports Collection' --with-system-zlib
--with-ecj-jar=/usr/local/share/java/ecj-4.5.jar
--enable-languages=c,c++,objc,fortran,java --prefix=/usr/local
--mandir=/usr/local/man --infodir=/usr/local/info/gcc49
--build=i386-portbld-freebsd8.4
Thread model: posix
gcc version 4.9.3 20150204 (prerelease) (FreeBSD Ports Collection)
When compiling at the -Os optimization level, g++ 4.9 sometimes leaves
undefined symbols in the resulting .o file. In the example below, this causing
a fatal linker error when trying to build a shared library that includes this
.o file. This problem does not occur when compiling with -O0 optimization, and
does not occur with g++ 4.8.
In this example, the following class methods are inline:
KeyListenerMultiplexer::acquire()
FocusListenerMultiplexer::acquire()
MouseListenerMultiplexer::acquire()
PaintListenerMultiplexer::acquire()
WindowListenerMultiplexer::acquire()
MouseMotionListenerMultiplexer::acquire()
When the code is compiled with g++ 4.9 and -Os, the .o file contains undefined
symbols for them. This does not happen with g++ 4.8 or when compiling with
-O0.
Broken:
# g++49 -fPIC -fmessage-length=0 -fno-common -fno-strict-aliasing
-fno-use-cxa-atexit -fvisibility-inlines-hidden -fvisibility=hidden
-fexceptions -fno-enforce-eh-specs -Os -c fmgridif.ii -Wall -o fmgridif.o
# nm fmgridif.o | grep 'ListenerMultiplexer' U
_ZThn24_N22KeyListenerMultiplexer7acquireEv
U _ZThn24_N24FocusListenerMultiplexer7acquireEv
U _ZThn24_N24MouseListenerMultiplexer7acquireEv
U _ZThn24_N24PaintListenerMultiplexer7acquireEv
U _ZThn24_N25WindowListenerMultiplexer7acquireEv
U _ZThn24_N30MouseMotionListenerMultiplexer7acquireEv
#
Works:
# g++49 -fPIC -fmessage-length=0 -fno-common -fno-strict-aliasing
-fno-use-cxa-atexit -fvisibility-inlines-hidden -fvisibility=hidden
-fexceptions -fno-enforce-eh-specs -O0 -c fmgridif.ii -Wall -o fmgridif.o
# nm fmgridif.o | grep 'ListenerMultiplexer'
#
Works:
# g++48 -fPIC -fmessage-length=0 -fno-common -fno-strict-aliasing
-fno-use-cxa-atexit -fvisibility-inlines-hidden -fvisibility=hidden
-fexceptions -fno-enforce-eh-specs -Os -c fmgridif.ii -Wall -o fmgridif.o
# nm fmgridif.o | grep 'ListenerMultiplexer'
#
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/65009] g++ 4.9 sometimes leaves inline methods undefined when compiling with -Os
2015-02-10 23:23 [Bug c++/65009] New: g++ 4.9 sometimes leaves inline methods undefined when compiling with -Os truckman at FreeBSD dot org
@ 2015-02-11 0:11 ` truckman at FreeBSD dot org
2015-02-11 9:20 ` [Bug c++/65009] [4.9 Regression] " jakub at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: truckman at FreeBSD dot org @ 2015-02-11 0:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65009
--- Comment #1 from Don Lewis <truckman at FreeBSD dot org> ---
Created attachment 34719
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34719&action=edit
example code that generates undefined symbols for inline methods when compiled
with -Os
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/65009] [4.9 Regression] g++ 4.9 sometimes leaves inline methods undefined when compiling with -Os
2015-02-10 23:23 [Bug c++/65009] New: g++ 4.9 sometimes leaves inline methods undefined when compiling with -Os truckman at FreeBSD dot org
2015-02-11 0:11 ` [Bug c++/65009] " truckman at FreeBSD dot org
@ 2015-02-11 9:20 ` jakub at gcc dot gnu.org
2015-02-11 9:43 ` rguenth at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-11 9:20 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65009
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-02-11
CC| |hubicka at gcc dot gnu.org,
| |jakub at gcc dot gnu.org
Target Milestone|--- |4.9.3
Summary|g++ 4.9 sometimes leaves |[4.9 Regression] g++ 4.9
|inline methods undefined |sometimes leaves inline
|when compiling with -Os |methods undefined when
| |compiling with -Os
Ever confirmed|0 |1
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Bisected to r206042, related to devirtualization. Since that commit there is:
U _ZThn24_N22KeyListenerMultiplexer7acquireEv
U _ZThn24_N24FocusListenerMultiplexer7acquireEv
U _ZThn24_N24MouseListenerMultiplexer7acquireEv
U _ZThn24_N24PaintListenerMultiplexer7acquireEv
U _ZThn24_N25WindowListenerMultiplexer7acquireEv
U _ZThn24_N30MouseMotionListenerMultiplexer7acquireEv
Stopped on the trunk with r215902, since then there is:
00000000 W _ZN22KeyListenerMultiplexer7acquireEv
00000000 W _ZN23ListenerMultiplexerBase7acquireEv
00000000 W _ZN24FocusListenerMultiplexer7acquireEv
00000000 W _ZN24MouseListenerMultiplexer7acquireEv
00000000 W _ZN24PaintListenerMultiplexer7acquireEv
00000000 W _ZN25WindowListenerMultiplexer7acquireEv
00000000 W _ZN30MouseMotionListenerMultiplexer7acquireEv
00000009 W _ZThn24_N22KeyListenerMultiplexer7acquireEv
00000009 W _ZThn24_N24FocusListenerMultiplexer7acquireEv
00000009 W _ZThn24_N24MouseListenerMultiplexer7acquireEv
00000009 W _ZThn24_N24PaintListenerMultiplexer7acquireEv
00000009 W _ZThn24_N25WindowListenerMultiplexer7acquireEv
00000009 W _ZThn24_N30MouseMotionListenerMultiplexer7acquireEv
Still reproduceable on the 4.9 branch.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/65009] [4.9 Regression] g++ 4.9 sometimes leaves inline methods undefined when compiling with -Os
2015-02-10 23:23 [Bug c++/65009] New: g++ 4.9 sometimes leaves inline methods undefined when compiling with -Os truckman at FreeBSD dot org
2015-02-11 0:11 ` [Bug c++/65009] " truckman at FreeBSD dot org
2015-02-11 9:20 ` [Bug c++/65009] [4.9 Regression] " jakub at gcc dot gnu.org
@ 2015-02-11 9:43 ` rguenth at gcc dot gnu.org
2015-06-26 20:01 ` jakub at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-02-11 9:43 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65009
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Priority|P3 |P2
Known to work| |4.8.3, 5.0
Known to fail| |4.9.0
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/65009] [4.9 Regression] g++ 4.9 sometimes leaves inline methods undefined when compiling with -Os
2015-02-10 23:23 [Bug c++/65009] New: g++ 4.9 sometimes leaves inline methods undefined when compiling with -Os truckman at FreeBSD dot org
` (2 preceding siblings ...)
2015-02-11 9:43 ` rguenth at gcc dot gnu.org
@ 2015-06-26 20:01 ` jakub at gcc dot gnu.org
2015-06-26 20:31 ` jakub at gcc dot gnu.org
2015-09-05 5:59 ` truckman at FreeBSD dot org
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-06-26 20:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65009
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.9.3 has been released.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/65009] [4.9 Regression] g++ 4.9 sometimes leaves inline methods undefined when compiling with -Os
2015-02-10 23:23 [Bug c++/65009] New: g++ 4.9 sometimes leaves inline methods undefined when compiling with -Os truckman at FreeBSD dot org
` (3 preceding siblings ...)
2015-06-26 20:01 ` jakub at gcc dot gnu.org
@ 2015-06-26 20:31 ` jakub at gcc dot gnu.org
2015-09-05 5:59 ` truckman at FreeBSD dot org
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-06-26 20:31 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65009
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.9.3 |4.9.4
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/65009] [4.9 Regression] g++ 4.9 sometimes leaves inline methods undefined when compiling with -Os
2015-02-10 23:23 [Bug c++/65009] New: g++ 4.9 sometimes leaves inline methods undefined when compiling with -Os truckman at FreeBSD dot org
` (4 preceding siblings ...)
2015-06-26 20:31 ` jakub at gcc dot gnu.org
@ 2015-09-05 5:59 ` truckman at FreeBSD dot org
5 siblings, 0 replies; 7+ messages in thread
From: truckman at FreeBSD dot org @ 2015-09-05 5:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65009
--- Comment #4 from Don Lewis <truckman at FreeBSD dot org> ---
Still fails with:
% gcc49 --version
gcc49 (FreeBSD Ports Collection) 4.9.4 20150819 (prerelease)
Copyright (C) 2015 Free Software Foundation, Inc.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2015-09-05 5:59 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2015-02-10 23:23 [Bug c++/65009] New: g++ 4.9 sometimes leaves inline methods undefined when compiling with -Os truckman at FreeBSD dot org
2015-02-11 0:11 ` [Bug c++/65009] " truckman at FreeBSD dot org
2015-02-11 9:20 ` [Bug c++/65009] [4.9 Regression] " jakub at gcc dot gnu.org
2015-02-11 9:43 ` rguenth at gcc dot gnu.org
2015-06-26 20:01 ` jakub at gcc dot gnu.org
2015-06-26 20:31 ` jakub at gcc dot gnu.org
2015-09-05 5:59 ` truckman at FreeBSD dot org
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