RE: [Adi-buildroot-devel] [Consult] blackfin: About one building break issue for STACKTRACE

[Zhang, Sonic]

Hi Gang,

Please only use the GCC for Blackfin 2013R1 or 2014R1 from https://sourceforge.net/projects/adi-buildroot/files/ . Upstream GCC5 isn't ported to Blackfin properly.

Regards,

Sonic

>-----Original Message-----
>From: Chen Gang [mailto:xili_gchen_5257@xxxxxxxxxxx]
>Sent: Thursday, April 16, 2015 11:22 PM
>To: realmz6@xxxxxxxxx; Richard Weinberger
>Cc: adi-buildroot-devel@xxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
>Subject: [Adi-buildroot-devel] [Consult] blackfin: About one building break issue for STACKTRACE
>
>Hello Maintainers:
>
>I want to consult one building issue about blackfin, the related issue
>is:
>
>    CC      arch/blackfin/kernel/stacktrace.o
>  arch/blackfin/kernel/stacktrace.c: In function 'save_stack_trace':
>  arch/blackfin/kernel/stacktrace.c:23:6: error: frame pointer required, but reserved
>   void save_stack_trace(struct stack_trace *trace)
>        ^
>  arch/blackfin/kernel/stacktrace.c:13:24: note: for 'current_frame_pointer'
>   register unsigned long current_frame_pointer asm("FP");
>                          ^
>
>For me:
>
> - Originally, I treated it as gcc's issue, but after think of, for me,
>   gcc is OK:
>
>    "-fomit-frame-pointer" is needed by extern "FP" pointer.
>
>    "-fomit-frame-pointer" is against "-pg" (they can not be together).
>
> - For kernel:
>
>    STACKTRACE needs "-fomit-frame-pointer", and FUNCTION_TRACER will
>    enable "-pg",
>
>    FUNCTION_TRACER and STACKTRACE are related.
>
>    The related commit: "1c873be Blackfin: initial support for ftrace"
>    (the commit time point is Jun 9 2009).
>
> - After this related commit, it never can pass building by upstream
>   blackfin gcc5:
>
>    make defconfig && make menuconfig
>
>    enable FUNCTION_TRACER (which also enable STACKTRACE)
>
>    make (which will cause building break)
>
>So I want to consult:
>
> - Is it OK to use upstream gcc5 for blackfin? (or which gcc version is
>   suitable for building blackfin Linux kernel?)
>
> - Did the original commit pass building ? (e.g. by one of old gcc
>   version).
>
> - How to fix this issue, next?
>
>
>Welcome any members ideas, suggestions and completions.
>
>Thanks.
>--
>Chen Gang
>
>Open, share, and attitude like air, water, and life which God blessed
>
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