This is the mail archive of the
gcc-help@gcc.gnu.org
mailing list for the GCC project.
Re: GCC not calling __main()?
On Wed, Sep 12, 2007 at 11:06:12AM -0700, Rick Mann wrote:
>
> On Sep 12, 2007, at 1:57 AM, Rask Ingemann Lambertsen wrote:
>
> >If your target defines the INIT_SECTION_ASM_OP macro, then __main()
> >isn't normally used.
>
> Thanks for that info. If I understand it correctly, the various
> macros need to be defined when building GCC, right (not when building
> target code).
Yes. Most ELF targets don't use __main() while e.g. all a.out targets
must (I think).
> How do I determine how my target was built? I chose --target=arm-elf,
> and searching in the GCC sources for macro names like
> TARGET_ASM_NAMED_SECTION and INIT_SECTION_ASM_OP turn up nothing in
> gcc/config/arm/elf.h. Where else should I be looking?
For ELF targets, usually gcc/config/elfos.h (which many targets include
indirectly through gcc/tm.h which lives in the build directory and is set up
in gcc/config.gcc - look for arm*-*-elf and the tm_file definition).
> If I need to change the configuration, how do I do that? On the
> configure line? Or do I pre-define some things when calling make?
Adding
#undef INIT_SECTION_ASM_OP
to gcc/config/arm/elf.h ought to do the trick.
--
Rask Ingemann Lambertsen