Data Distribution

I can't think of a good alternative to #pragma for your case. Also I don't
recommend you use debug information in linker as they might not be accurate.

Best solution is still to implement ideas like in
https://answers.launchpad.net/gcc-arm-embedded/+question/201738.

A workaround like following probably help:

--------
data.h
--------
#define DISTRIBUTE(a) __attribute__((section(DISTRIBUTE_SECTION_##a))) a
#define DISTRIBUTE_SECTION_gint ".data"
#define DISTRIBUTE_SECTION_fint ".m_data2"
-------
test.c:
-------

#include "data.h"
int DISTRIBUTE(gint) = 0;
double DISTRIBUTE(fint);
 void main() {
}

Thanks - Joey
On Mon, Aug 13, 2012 at 2:31 PM, Deepa Ballari <
<email address hidden>> wrote:

> New question #205674 on GCC ARM Embedded:
> https://answers.launchpad.net/gcc-arm-embedded/+question/205674
>
> Hello,
>
> I'm from Freescale and checking the feasibility of implementing data
> distribution in GNU linker that is mentioned here:
> https://answers.launchpad.net/gcc-arm-embedded/+question/201738
>
> With one of our target, data distribution is supported. It is a 2 pass
> compile/link process. In Pass1,linker generates the header file which has
> info on object going to particular section.
> In pass2, the header file is included and the sources are
> re-compiled/linked.
>
> For instance:
>
> -------
> data.h: /* This is generated by linker in Pass1 and is included in Pass2
> compilation step */
> -------
> #pragma DATA_SEG __DEFAULT_SEG_CC__ DATA_DISTRIBUTE0 /* DATA_DISTRIBUTE0
> is a data segment */
> /* list of all distributed objects in data segment */
> #pragma REALLOC_OBJ "DATA_DISTRIBUTE0" gint __NON_FAR_DAC__ /* gint goes
> to "DATA_DISTRIBUTE0" section */
>
> The generated header file does not has info on data type of the variable.
> -------
> test.c:
> -------
>
> #include "data.h"
> int gint = 0;
> void main() {
> }
>
> If I want to replicate the same with GNU tools then I'm stumbling with an
> issue in getting the data type of variable from linker.One possibility is
> to get from debug sections but checking if there is a way to do without it.
>
> Let's assume GNU linker will generate the data.h in Pass1.
> data.h:
> gint __attribute__ ((section(".data")));
> fint __attribute__ ((section(".m_data2")));
>
> However, there is a miss to include the data type of the variable.
>
> In Pass2, is there a way to include this header file and compile without
> errors OR any other workarounds which would work with data.h?
>
> ld throws this warning:
> warning: data definition has no type or storage class [enabled by default]
>
> It works ok _only_ if gint/fint are defined as "int" data types and errors
> for others(checked for struct).
>
> Thanks,
> Deepa
>
>
>
> --
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