[Bug c++/15229] Omits constructor calls for variables not used otherwise.

[Bug c++/15229] Omits constructor calls for variables not used otherwise.

[duz at sol-3 dot de]

------- Additional Comments From duz at sol-3 dot de  2004-04-30 15:56 -------
Created an attachment (id=6198)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=6198&action=view)
The specs file from the compiler I've built here on Linux.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15229

[Bug c++/15229] New: Omits constructor calls for variables not used otherwise.

[duz at sol-3 dot de]

I have a variable of a class type. The side-effect of the constructor is
registering and ordering some stuff in a table. The variable is declared in
main. It is not used otherwise in main. Thus I want to achieve that the table's
contents is set up properly while main is running, i.e. after global constructor
runtime but before anything else interesting happens.

I tried to find a trivial test case, but trivial cases work fine. So here comes
the big one. Attached is preprocessed C++-file

    trader-main.ii

I compiled with the command

    g++-3.4 -v -S -O -fno-exceptions trader-main.ii

(The bug also happens when I replace -O by -g. Then I see when stepping
through the program, how the debugger omits the lines instantiating the
variables in question.)

The variables are of class "Lingo", constructor declared in line

    trader-main.ii:13863

The variable instantiations inside main is in lines

    trader-main.ii:46019 through 46021

You see clearly in the resulting assembly code, that these constructor
calls are missing at the beginning of main. There should be three
calls to "Lingo::Lingo" around line

    trader-main.s:310

The corresponding destructor calls are generated in lines

    trader-main.s:396 ff.

Thank you for your time.

Ups, where do I attach the files to this form?
I'll submit it now and try to add them later.

-- 
           Summary: Omits constructor calls for variables not used
                    otherwise.
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: duz at sol-3 dot de
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15229

[Bug c++/15229] Omits constructor calls for variables not used otherwise.

[duz at sol-3 dot de]

------- Additional Comments From duz at sol-3 dot de  2004-04-30 15:57 -------
Created an attachment (id=6199)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=6199&action=view)
How I compiled the preprocessed source file plus compiler messages.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15229

[Bug c++/15229] Omits constructor calls for variables not used otherwise.

[duz at sol-3 dot de]

------- Additional Comments From duz at sol-3 dot de  2004-04-30 16:00 -------
Created an attachment (id=6200)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=6200&action=view)
The preprocessed source file.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15229

[Bug c++/15229] Omits constructor calls for variables not used otherwise.

[duz at sol-3 dot de]

------- Additional Comments From duz at sol-3 dot de  2004-04-30 16:00 -------
Created an attachment (id=6201)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=6201&action=view)
The resulting assembler source, which hopefully shows the problem.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15229

[Bug c++/15229] Omits constructor calls for variables not used otherwise.

[duz at sol-3 dot de]

------- Additional Comments From duz at sol-3 dot de  2004-04-30 16:43 -------
I just tried it on solaris-8 for sparc, with the compiler prebuilt from
sunfreeware.com:

$ /usr/local/bin/g++ -v -help 
Reading specs from /usr/local/lib/gcc/sparc-sun-solaris2.8/3.4.0/specs
Configured with: ../configure --with-as=/usr/ccs/bin/as
--with-ld=/usr/ccs/bin/ld --disable-nls
Thread model: posix
gcc version 3.4.0
$ 

Same problem.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15229

[Bug c++/15229] Omits constructor calls for variables not used otherwise.

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-04-30 17:22 -------
Invalid, this code is equivent to this simplifed case:
struct Lingo
{
  Lingo ();
};
struct ALingo : Lingo
{
  ALingo();
};
int main()
{
  ALingo a;
  Lingo b(a); // <-- calls the copy constrctor
}

Since there is no user defined copy constructor, the compiler creates one for you (by the rules of C++).
So this is invalid, to solve this you need to define a copy constructor.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15229