linux-kernel - Re: [PATCH v2] h8300/kernel/setup.c: add "linux/initrd.h" to pass compiling

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Date:	Fri, 30 Aug 2013 14:34:24 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2]  h8300/kernel/setup.c: add "linux/initrd.h" to pass
 compiling

On 08/30/2013 12:53 PM, Guenter Roeck wrote:
> On 08/29/2013 08:59 PM, Chen Gang wrote:
>> The related error (allmodconfig for h8300):
>>
>>    arch/h8300/kernel/setup.c: In function 'setup_arch':
>>    arch/h8300/kernel/setup.c:103:3: error: 'initrd_start' undeclared
>> (first use in this function)
>>       initrd_start = memory_start;
>>       ^
>>    arch/h8300/kernel/setup.c:103:3: note: each undeclared identifier
>> is reported only once for each function it appears in
>>    arch/h8300/kernel/setup.c:104:3: error: 'initrd_end' undeclared
>> (first use in this function)
>>       initrd_end = memory_start += be32_to_cpu(((unsigned long *)
>> (memory_start))[2]);
>>       ^
>>
>> Signed-off-by: Chen Gang <gang.chen@...anux.com>
>> ---
> 
> Maybe an odd question, but is there a way to actually compile the h8300
> target

Firstly, at least for me, I don't think it is an odd question.  :-)

For the tool-chain:

  I compiled the cross-compiler from the gcc and binutils source code.
  GCC has too many bugs to compile kernel with -Os (normal make will fail).
  If without -Os (no optimization), it can work correctly which is enough for my goal: "let h8300 pass allmodconfig".  ;-)

>From building with allmodconfig for h8300:

  I can find more chances to provide contributes (both for h8300 and for others).
  I can learn more in kernel wide.
  I can familiar the gcc and binutils step by step (especially to familiar with their issues).

Next:

  I will communicate/work with the gcc guys for the gcc issues which found by building kernel.

  :-)

> in the first place ? The cross compiler on kernel.org doesn't work, nor
> does
> the one available through Ubuntu.
> 
> Guenter
> 

For binutils, no release under Ubuntu, and the Fedora17's is incorrect
(can not use), but the binutils-2.22 from gnu is OK.

For gcc, no release under Ubuntu, for Fedora17's, gcc-4.9, gcc-4.8,
gcc-4.7.4, and gcc-4.4.7 all have bugs for compiling kernel(their bugs
are different too).

It is really not easy to fix these bugs (gcc guys have too many issues
to fix), even if really find the root cause, it is still difficult to
fix (fix one bug is very easy to cause another more issues).

I almost have no compiler related experience, but I plan to dive into
 -- Nothing is impossible, if God bless.

Thanks.
-- 
Chen Gang
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