linux-kernel - Re: [PATCH] blackfin: Makefile: Add -D__linux__ flag for KBUILD

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Date:	Sun, 5 Apr 2015 05:13:40 +0800
From:	Chen Gang <xili_gchen_5257@...mail.com>
To:	Richard Weinberger <richard.weinberger@...il.com>
CC:	realmz6@...il.com,
	"adi-buildroot-devel@...ts.sourceforge.net" 
	<adi-buildroot-devel@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] blackfin: Makefile: Add -D__linux__ flag for KBUILD_CFLAGS

On 4/4/15 06:56, Richard Weinberger wrote:
> On Fri, Apr 3, 2015 at 10:19 PM, Chen Gang <xili_gchen_5257@...mail.com> wrote:
>> The related error with allmodconfig:
> 
> BTW: How do you generate this allmodconfig?
> "make allmodconfig ARCH=blackfin" cannot work as you need to specify a board...
> 
[...]
> Hmm, what compiler are you using?
> It's odd that __linux__ is not defined...
> 

I built the raw cross compiler from the latest gcc/binutils's upsteam
code:

 - binutils:

   ../binutils-gdb/configure --prefix=/upstream/release-blackfin --target=bfin-gchen-elf --disable-nls --with-sysroot=/upstream/release-blackfin --without-headers target_alias=bfin-gchen-elf
   make && make install

   [root@...alhost build-binutils-blackfin]# /upstream/release-blackfin/bin/bfin-gchen-elf-ld -v
   GNU ld (GNU Binutils) 2.25.51.20150401

 - gcc:

   ../gcc-blackfin/configure --target=bfin-gchen-elf --disable-nls --disable-threads --disable-shared --disable-libssp --disable-libquadmath --disable-libgomp --disable-libatomic --prefix=/upstream/release-blackfin --without-headers target_alias=bfin-gchen-elf --enable-languages=c,lto
   make all-gcc && make all-target-libgcc && make install 

   [root@...alhost build-binutils-blackfin]# /upstream/release-blackfin/bin/bfin-gchen-elf-gcc -v
   Using built-in specs.
   COLLECT_GCC=/upstream/release-blackfin/bin/bfin-gchen-elf-gcc
   COLLECT_LTO_WRAPPER=/upstream/release-blackfin/libexec/gcc/bfin-gchen-elf/5.0.0/lto-wrapper
   Target: bfin-gchen-elf
   Configured with: ../gcc-blackfin/configure --target=bfin-gchen-elf --disable-nls --disable-threads --disable-shared --disable-libssp --disable-libquadmath --disable-libgomp --disable-libatomic --prefix=/upstream/release-blackfin --without-headers target_alias=bfin-gchen-elf --enable-languages=c,lto
   Thread model: single
   gcc version 5.0.0 20150401 (experimental) (GCC) 

 - kernel using:

   make ARCH=blackfin CROSS_COMPILE=/upstream/release-blackfin/bin/bfin-gchen-elf-


Is what I have done above correct? Or can we treate it as gcc's issue?


Thanks.
-- 
Chen Gang

Open, share, and attitude like air, water, and life which God blessed
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