Re: c++/10307: constructor for static object of template omitted

Re: c++/10307: constructor for static object of template omitted

[bangerth]

Synopsis: constructor for static object of template omitted

State-Changed-From-To: analyzed->closed
State-Changed-By: bangerth
State-Changed-When: Mon Apr  7 14:20:28 2003
State-Changed-Why:
    Independent analysis here:
      http://gcc.gnu.org/ml/gcc-bugs/2003-04/msg00183.html

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10307

Re: c++/10307: constructor for static object of template omitted

[Wolfgang Bangerth]

The following reply was made to PR c++/10307; it has been noted by GNATS.

From: Wolfgang Bangerth <bangerth@ices.utexas.edu>
To: Douglas Kilpatrick <kilpatds@oppositelock.org>
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: c++/10307: constructor for static object of template omitted
Date: Fri, 4 Apr 2003 14:17:24 -0600 (CST)

 > I would have though that a subclass of a template by a non-template would
 > cause the template to be instantiated, but it doesn't seem to.  I have to
 > declare an explicit variable of the non-template class to get things to
 > work.
 
 Well, each component of a template can be instantiated in two ways:
 - an explicit instantiation
 - implicit instantiation by using this part (i.e. using a template member 
   function, etc)
 Note that in implicit instantiation, using one part of a template class 
 doesn't imply that _all_ the parts are instantiated. Deriving from a class 
 (and using the derived class) counts as implicit instantiation of the base 
 class.
 
 > What's the syntax for forcing that without actually declaring a variable? 
 > Its not a template, so using the explicit template instantation syntax
 > doesn't work.  (Code freely available if you want it.  ~6k)
 
 Just as I wrote it:
   template int Class<int>::StaticMemberVariable;
 (that's an explicit instantiation), or simply instantiating the entire 
 class and all it's parts:
   template class Class<int>;
 
 W.
 
 -------------------------------------------------------------------------
 Wolfgang Bangerth              email:            bangerth@ices.utexas.edu
                                www: http://www.ices.utexas.edu/~bangerth/
 
 

Re: c++/10307: constructor for static object of template omitted

[Wolfgang Bangerth]

The following reply was made to PR c++/10307; it has been noted by GNATS.

From: Wolfgang Bangerth <bangerth@ices.utexas.edu>
To: gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: c++/10307: constructor for static object of template omitted
Date: Fri, 4 Apr 2003 14:12:44 -0600 (CST)

 ---------- Forwarded message ----------
 Date: Thu, 3 Apr 2003 23:11:31 -0500
 From: Douglas Kilpatrick <kilpatds@oppositelock.org>
 To: bangerth@dealii.org
 Subject: Re: c++/10307: constructor for static object of template omitted
 
 On 3 Apr 2003 22:23:55 -0000
 bangerth@dealii.org wrote:
 
 >     I think this is actually what the standard prescribes,
 >     since static variables are only instantiated by use or
 >     by explicit instantiation, not by instantiation of
 >     the class they belong to. In fact, you can make the above
 >     code work as you expect it by adding this line:
 >       template TemplateStatic Template<int>::s;
 
 Ok.  Question for you then...
 
 The actual place I ran into this was a plugin framework, trying to
 eliminate some of the cookie-cutter code.
 
 I have a base class that is the plugin interface.  I want to create a
 intermediate class that the user of the framework subclasses that handles
 registering the plugin and factory method on library load (dlopen()).
 Then the user subclasses from that.
 
 I would have though that a subclass of a template by a non-template would
 cause the template to be instantiated, but it doesn't seem to.  I have to
 declare an explicit variable of the non-template class to get things to
 work.
 
 What's the syntax for forcing that without actually declaring a variable? 
 Its not a template, so using the explicit template instantation syntax
 doesn't work.  (Code freely available if you want it.  ~6k)
 
 Or is this simply a case of "Don't Do That Then."? :)
 
 Doug
 -- 
 Doug Kilpatrick
 kilpatds@oppositelock.org
 

Re: c++/10307: constructor for static object of template omitted

[bangerth]

Synopsis: constructor for static object of template omitted

State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Thu Apr  3 22:23:54 2003
State-Changed-Why:
    Behavior confirmed with all versions of gcc (2.95 .. 3.4).
    Another testcase is this:
    ----------------------
    #include <iostream>
    
    // ------------- template
    
    int template_counter = 0;
    
    struct TemplateStatic {
        TemplateStatic () { ++template_counter; }
    };
    
    template <typename T> struct Template {
        static TemplateStatic s;
    };
    template <typename T> TemplateStatic Template<T>::s;
    
    // ------------ non-template
    
    int non_template_counter = 0;
    
    struct NonTemplateStatic {
        NonTemplateStatic () { ++non_template_counter; }
    };
    
    struct NonTemplate {
        static NonTemplateStatic s;
    };
    NonTemplateStatic NonTemplate::s;
    
    // ------------- use both
    
    int main() {
      Template<int> t;
      NonTemplate   nt;
    
      std::cout << template_counter << " "
                << non_template_counter << std::endl;
    }
    ---------------------------
    
    Both Template and NonTemplate have a static variable,
    but the constructor of them is only run for the non-template.
    
    I think this is actually what the standard prescribes,
    since static variables are only instantiated by use or
    by explicit instantiation, not by instantiation of
    the class they belong to. In fact, you can make the above
    code work as you expect it by adding this line:
      template TemplateStatic Template<int>::s;
    
    Maybe someone of those with more knowledge of these matters
    can confirm my interpretation?
    
    Regards
      Wolfgang
    
    PS: icc7 agrees with gcc in all this, so I'd say it's not
    a bug.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10307

c++/10307: constructor for static object of template omitted

[kilpatds]

>Number:         10307
>Category:       c++
>Synopsis:       constructor for static object of template omitted
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Thu Apr 03 21:46:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     kilpatds@oppositelock.org
>Release:        unknown-1.0
>Organization:
>Environment:
$ gcc -v
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --host=i386-redhat-linux --with-system-zlib --enable-__cxa_atexit
Thread model: posix
gcc version 3.2 20020903 (Red Hat Linux 8.0 3.2-7)
$ rpm -q gcc
gcc-3.2-7
$ rpm -q redhat-release
redhat-release-8.0-8
>Description:
The Base class has a static member with a constructor.
The member only exists for the side effects (registration).
The constructor of the static object is not being called.

I can "force" the constructor to be invoked by having it
modify a data element I read (and ignore) elsewhere.

As per the submission guidelines, I have attached the 
preprocessed files, but it only includes stdio.h

The hackaround addes a public integer "i" to StaticReg,
and sets it to 0 in the constructor of "derived"
$ diff -u Foo.ii Foo-hack.ii
--- Foo.ii      2003-04-03 16:41:22.000000000 -0500
+++ Foo-hack.ii 2003-04-03 16:41:55.000000000 -0500
@@ -1132,8 +1132,8 @@

 class StaticReg {

-
-
+    public:
+        int i;

     public:
         StaticReg() {
@@ -1154,7 +1154,7 @@
     public:
     derived() {

-
+        sr.i = 0;

         fputs("World", stdout);
     }
>How-To-Repeat:
$ make Foo Foo-hack
c++ -O2 --save-temps -o Foo Foo.cc
c++ -O2 -DHACKAROUND=1 -o Foo-hack Foo.cc
$ ./Foo
World
$ ./Foo-hack
Hello World
>Fix:
No clue.  Temporary hack around provided above.
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="Foo.ii"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="Foo.ii"

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