c++/9321: ctor not call in lib if a .cpp file doesn't have function called by the executable

c++/9321: ctor not call in lib if a .cpp file doesn't have function called by the executable

[lecroart]

>Number:         9321
>Category:       c++
>Synopsis:       ctor not call in lib if a .cpp file doesn't have function called by the executable
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 15 02:26:01 PST 2003
>Closed-Date:
>Last-Modified:
>Originator:     gcc
>Release:        gcc (GCC) 3.2.1
>Organization:
>Environment:
Linux linuxdev01 2.4.18-bf2.4 #1 Son Apr 14 09:53:28 CEST 2002 i686 unknown unknown GNU/Linux
>Description:
I create a lib that contains some .cpp. One .cpp in the lib contains only a ctor that should register into an array.
If I launch the executable, the ctor is not called (not registered). If now, I call, in the main, a function of the .cpp, now the ctor is called.
The behavior semms to be: If there s a .cpp without any function call in a lib, then ctor are not called.
>How-To-Repeat:
tar zxvf staticclass.tgz
./go
./a.out
look that only 2 string are registered (bug)
emacs main.cpp
uncomment the test_function();
./go
./a.out
look that the 3 string are registered (ok)
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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Re: c++/9321: ctor not call in lib if a .cpp file doesn't have function called by the executable

[bangerth]

Synopsis: ctor not call in lib if a .cpp file doesn't have function called by the executable

State-Changed-From-To: open->closed
State-Changed-By: bangerth
State-Changed-When: Wed Jan 15 07:01:29 2003
State-Changed-Why:
    Right, this is standard Unix linker behavior: object files
    that are not referenced from outside are discarded. The
    file in which you run your constructor is thus simply
    thrown away by the linker, which explains why the constructor
    is not run.
    
    W.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9321