Re: [ECOS] What is CYGBLD_ATTRIB_WEAK ?

["St. Zarifakis" <stz at swistec dot de>]

Hi,

copied out from GCC documentation (Ch 5.25 Declaring Attributes of 
Functions):

|weak|
   The |weak| attribute causes the declaration to be emitted as a weak
   symbol rather than a global. This is primarily useful in defining
   library functions which can be overridden in user code, though it
   can also be used with non-function declarations. Weak symbols are
   supported for ELF targets, and also for a.out targets when using the
   GNU assembler and linker.

Hope this helps
   Stamatis


Santanu Chatterjee wrote:

> Hello everybody,
>
> I was trying to go through some of the source code of eCos, and stumbled across
> the following in "ecos-2.0/packages/hal/common/v2_0/src/generic-stub.c":
> ------------------------------------------------------------------------------------------
> #ifdef __ECOS__
> char GDB_stubs_version[] CYGBLD_ATTRIB_WEAK =
>    "eCos GDB stubs - built " __DATE__ " / " __TIME__;
> #endif
> ------------------------------------------------------------------------------------------
>
> I could not understand the construct. What is CYGBLD_ATTRIB_WEAK?
> etags search brings me to the same place. I grepped around and
> found:
> -----------------------------------------------------------------------------------
> # define CYGBLD_ATTRIB_WEAK __attribute__ ((weak))
> -----------------------------------------------------------------------------------
> in "ecos-2.0/tools/src/infra/cyg_type.h". But I could not find out much
> about this __attribute__ thing. 
>
> Could anyone here please help me out? I just want to find out how the
> code within the #ifdef ... #endif expands to. I know about the -E option
> in gcc but don't know how to apply it here.
>
> Regards,
> Santanu
>
>  


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