__do_global_ctors missing

[Schmidt, Weston]

Thanks - I stopped attempting to call them & now I get further in the process.

--Wes
________________________________________
From: Ian Lance Taylor [iant@google.com]
Sent: Wednesday, September 26, 2012 6:07 AM
To: Schmidt, Weston
Cc: gcc-help@gcc.gnu.org
Subject: Re: __do_global_ctors missing

On Mon, Sep 24, 2012 at 4:06 PM, Schmidt, Weston
<Weston_Schmidt@cable.comcast.com> wrote:
>
> I'm having trouble attempting to upgrade from a 2.95 mips-wrs-elf compiler to a 4.7.2 mips-wrs-elf compiler.  I believe the link time options are the same:
>
> ../gcc-4.7.2/configure  \
>   --target=mips-wrs-elf --enable-languages=c,c++ \
>   --disable-nls --disable-libssp --with-system-zlib \
>   --enable-targets=mips-wrs-elf --disable-threads --with-newlib --disable-shared --without-included-gettext \
>   --enable-newlib-mb --enable-newlib-io-long-long \
>   --enable-version-specific-runtime-libs
>
> When I inspect the libgcc.a file for the 4.7.2 compiler, there are no __do_global_ctors or __do_global_dtors functions in __main.o.
>
> I expected to see something like this (from the 2.95 release):
> __main.o:
>          U __CTOR_LIST__
>          U __DTOR_LIST__
> 00000074 T __do_global_ctors
> 00000000 T __do_global_dtors
> 00000104 T __gccmain
> 00000000 t __gnu_compiled_c
> 00000000 t gcc2_compiled.
> 00000000 b initialized.10
> 00000000 d p.3
>
> Instead __main.o is empty.  I'm stumped & can't finish linking my cross-compiled project because it needs direct access to the __do_global_ctors/dtors functions.

In current GCC, when using ELF, constructors and destructors are run
by putting them in DT_INIT_ARRAY and DT_FINI_ARRAY sections.  There
are no __do_global_ctors/dtors functions because they are not
necessary.

You could try using --disable-initfini-array when you run configure.

Ian