[Bug c++/11137] New: Linux shared library constructors not called unless there's one global object

[Bug c++/11137] New: Linux shared library constructors not called unless there's one global object

[jcalcote@novell.com]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11137

           Summary: Linux shared library constructors not called unless
                    there's one global object
           Product: gcc
           Version: 3.2
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jcalcote@novell.com
                CC: gcc-bugs@gcc.gnu.org

Linux shared library constructor and destructor routines defined by the use of 
the __attribute__((constructor)) and __attribute__((destructor)) keywords are 
not called in C++ programs when the library is loaded/unloaded unless there is 
at least one global object in the module. Global constructors and destructors 
appears to work correctly in C programs. Only C++ programs exhibit this 
strange behaviour. I use the following hack to get my constructors to be 
called - I place this statement in my init/exit code:

static struct Stupid { Stupid() {} ~Stupid() {} } stupid;

which causes Stupid() to be executed at library load time, and then adds a 
call to my __attribute__((constructor)). 

Having disassembled the code to my module by using objdump, I can see that the 
routine that calls global object constructors is not injected unless there's 
at least one global object. Since calls to __attribute__((constructor)) 
routines are placed at the end of this compiler generated code, no such calls 
will be made if this code is not generated. The cause of generation of this 
routine appears to be the existance of a global C++ object, but not the 
existence of __attribute__((constuctor)) routines.

[Bug c++/11137] [3.3 Regression] Linux shared library constructors not called unless there's one global object

[pinskia@physics.uc.edu]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11137


pinskia@physics.uc.edu changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2003-06-10 01:24:28
               date|                            |
            Summary|Linux shared library        |[3.3 Regression] Linux
                   |constructors not called     |shared library constructors
                   |unless there's one global   |not called unless there's
                   |object                      |one global object
   Target Milestone|3.4                         |3.3.1


------- Additional Comments From pinskia@physics.uc.edu  2003-06-10 01:24 -------
I could reproduce this on 2.95.2, 3.0.4, 3.2.2, 3.2.3, and 3.3.1 (20030526) but it is fixed on 
the mainline (20030609) and it works on egcs-2.91.66, so this is a regression from that 
which is a very old but still a regression.

[Bug c++/11137] [3.3 Regression] Linux shared library constructors not called unless there's one global object

[pinskia at physics dot uc dot edu]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11137



------- Additional Comments From pinskia at physics dot uc dot edu  2003-06-29 15:58 -------
I forgot to put the testcase I used:
pr11137.cc:
extern "C" int printf(const char*,...);
void f() __attribute__((constructor));
void f()
{
        printf("Hi\n");
}
pr11137.1.cc:
int main() {return 0;}

gcc -shared -o pr11137.so  pr11137.cc
gcc pr11137.1.cc pr11137.so
env LD_LIBRARY_PATH=.:${LD_LIBRARY_PATH} ./a.out

It should be print "Hi" but it does not on 3.3.1 (20030616) because gcc does not create a 
function which calls f() but 3.4 does.

[Bug c++/11137] [3.3 Regression] Linux shared library constructors not called unless there's one global object

[cvs-commit at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11137



------- Additional Comments From cvs-commit at gcc dot gnu dot org  2003-07-01 18:14 -------
Subject: Bug 11137

CVSROOT:	/cvs/gcc
Module name:	gcc
Branch: 	gcc-3_3-branch
Changes by:	mmitchel@gcc.gnu.org	2003-07-01 18:14:34

Modified files:
	gcc/cp         : ChangeLog decl2.c 
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/g++.dg/init: attrib1.C 

Log message:
	PR c++/11137
	* decl2.c (generate_ctor_or_dtor_function): Tolerate a
	non-existant ssdf_decls array.
	(finish_file): Call generator_ctor_or_dtor_function when there are
	static constructors or destructors and no other static
	initializations.
	
	PR c++/11137
	* g++.dg/init/attrib1.C: New test.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=1.3076.2.171&r2=1.3076.2.172
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/decl2.c.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=1.575.2.31&r2=1.575.2.32
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=1.2261.2.211&r2=1.2261.2.212
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/init/attrib1.C.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=NONE&r2=1.1.8.1

[Bug c++/11137] [3.3 Regression] Linux shared library constructors not called unless there's one global object

[mmitchel at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11137


mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


------- Additional Comments From mmitchel at gcc dot gnu dot org  2003-07-01 18:15 -------
Fixed in GCC 3.3.1.

[Bug c++/11137] [3.3 Regression] Linux shared library constructors not called unless there's one global object

[cvs-commit at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11137



------- Additional Comments From cvs-commit at gcc dot gnu dot org  2003-08-12 14:14 -------
Subject: Bug 11137

CVSROOT:	/cvs/gcc
Module name:	gcc
Branch: 	gcc-3_2-rhl8-branch
Changes by:	jakub@gcc.gnu.org	2003-08-12 14:14:49

Modified files:
	gcc            : ChangeLog 
	gcc/cp         : decl2.c 
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/g++.dg/init: attrib1.C 

Log message:
	PR c++/11137
	* decl2.c (generate_ctor_or_dtor_function): Tolerate a
	non-existant ssdf_decls array.
	(finish_file): Call generator_ctor_or_dtor_function when there are
	static constructors or destructors and no other static
	initializations.
	
	PR c++/11137
	* g++.dg/init/attrib1.C: New test.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_2-rhl8-branch&r1=1.13152.2.657.2.27.2.155&r2=1.13152.2.657.2.27.2.156
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/decl2.c.diff?cvsroot=gcc&only_with_tag=gcc-3_2-rhl8-branch&r1=1.520.2.7.2.3.2.7&r2=1.520.2.7.2.3.2.8
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_2-rhl8-branch&r1=1.1672.2.166.2.8.2.64&r2=1.1672.2.166.2.8.2.65
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/init/attrib1.C.diff?cvsroot=gcc&only_with_tag=gcc-3_2-rhl8-branch&r1=NONE&r2=1.1.16.1

[Bug c++/11137] [3.3 Regression] Linux shared library constructors not called unless there's one global object

[hjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11137

--- Comment #6 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> 2010-11-16 17:56:57 UTC ---
Author: hjl
Date: Tue Nov 16 17:56:50 2010
New Revision: 166810

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=166810
Log:
Properly demangle a global constructor symbol.

2010-11-16  H.J. Lu  <hongjiu.lu@intel.com>

    PR other/42670
    PR binutils/11137
    * cp-demangle.c (d_make_demangle_mangled_name): New.
    (d_demangle_callback): Use it on DCT_GLOBAL_XTORS.

    * testsuite/demangle-expected: Updated.

Modified:
    trunk/libiberty/ChangeLog
    trunk/libiberty/cp-demangle.c
    trunk/libiberty/testsuite/demangle-expected