Re: [Bug c++/43330] New: trivial types are not being statically initialized

[Andrew Pinski <pinskia at gmail dot com>]

Sent from my iPhone

On Mar 11, 2010, at 3:24 AM, "eric dot niebler at gmail dot com" <gcc-bugzilla@gcc.gnu.org 
> wrote:

> According to the C++0x status page
> (http://gcc.gnu.org/gcc-4.5/cxx0x_status.html), "Standard Layout  
> Types"
> (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2342.htm)  
> have been
> implemented in gcc-4.5. A quick test shows that trivial types are  
> not being
> statically initialized, as the paper requires. The following struct  
> S is
> trivial and the non-local constant s should be statically  
> initialized, IIUC:
>
>  struct S
>  {
>    S() {}
>  };

The above is not a trivial type though. It has a non trivial default  
constructor. If you want a trivial constructor use either "= default"  
or delete it all together.


>  S const s{};
>
> However, when compiled with -O2 -std=c++0x -S using the latest 4.5  
> snapshot, I
> see the following assembly:
>
>        .file   "main.cpp"
>        .text
>        .p2align 4,,15
>        .def    __GLOBAL__I_main.cpp;   .scl    3;      .type    
> 32;     .endef
> __GLOBAL__I_main.cpp:
>        pushl   %ebp
>        movl    %esp, %ebp
>        popl    %ebp
>        ret
>        .section        .ctors,"w"
>        .align 4
>        .long   __GLOBAL__I_main.cpp
>
> Unless I'm mistaken, the global s is still being dynamically  
> initialized.
> Apologies in advance if I'm reading this wrong.
>
>
> --
>           Summary: trivial types are not being statically initialized
>           Product: gcc
>           Version: 4.5.0
>            Status: UNCONFIRMED
>          Severity: normal
>          Priority: P3
>         Component: c++
>        AssignedTo: unassigned at gcc dot gnu dot org
>        ReportedBy: eric dot niebler at gmail dot com
> GCC build triplet: gcc-4.5-20100304
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43330