linux-kernel - Re: [PATCH 3/4] kbuild: link of vmlinux moved to a script

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Date:	Thu, 10 May 2012 14:22:10 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	Sam Ravnborg <sam@...nborg.org>, Tony Luck <tony.luck@...il.com>,
	linux arch <linux-arch@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	Richard Weinberger <richard@....at>,
	"David S. Miller" <davem@...emloft.net>,
	Arnaud Lacombe <lacombar@...il.com>,
	Andi Kleen <andi@...stfloor.org>, ralf@...ux-mips.org,
	linux-mips@...ux-mips.org
Subject: Re: [PATCH 3/4] kbuild: link of vmlinux moved to a script

On Wed, May 09, 2012 at 06:58:16PM -0400, Paul Gortmaker wrote:
> On Tue, May 8, 2012 at 12:51 PM, Sam Ravnborg <sam@...nborg.org> wrote:
> > diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
> > index 26c5b65..1f4c27b 100644
> > --- a/scripts/link-vmlinux.sh
> > +++ b/scripts/link-vmlinux.sh
> > @@ -78,8 +78,8 @@ kallsyms()
> >                kallsymopt=--all-symbols
> >        fi
> >
> > -       local aflags="${KBUILD_AFLAGS} ${NOSTDINC_FLAGS}                     \
> > -                     ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
> > +       local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL}               \
> > +                     ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
> 
> All the linux-next builds for mips are failing, which I tracked down to this.
> Applying the above update doesn't help.  What is happening is that MIPS
> gets KBUILD_CPPFLAGS double-quoted, and then you get:
> 
> + mips-wrs-linux-gnu-nm -n .tmp_vmlinux1
> + scripts/kallsyms
> + mips-wrs-linux-gnu-gcc -D__ASSEMBLY__ <..snip..>  -D__KERNEL__
> '-D"VMLINUX_LOAD_ADDRESS=0xffffffff81100000"' '-D"DATAOFFSET=0"' -c -o
> .tmp_kallsyms1.o -x assembler-with-cpp -
> <command-line>:0: error: macro names must be identifiers
> <command-line>:0: error: macro names must be identifiers
> make[1]: *** [vmlinux] Error 1
> 
> Note the  '-D"VMLINUX_LOAD_ADDRESS=0xffffffff81100000"' '-D"DATAOFFSET=0"'
> part -- that is what triggers the two above errors.

I think it should be as simple as the below patch. But I have no mips
machine to verify myself.

Michal

>From d801533d5e6e509d5e115d2fb47655267c4c5ed4 Mon Sep 17 00:00:00 2001
From: Michal Marek <mmarek@...e.cz>
Date: Thu, 10 May 2012 14:15:49 +0200
Subject: [PATCH] mips: Fix KBUILD_CPPFLAGS definition

The KBUILD_CPPFLAGS variable is no longer passed to sh -c 'gcc ...',
but exported and used by the link-vmlinux.sh script. This means that the
double-quotes will not be evaluated by the shell.

Reported-by: Paul Gortmaker <paul.gortmaker@...driver.com>
Signed-off-by: Michal Marek <mmarek@...e.cz>

diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 4fedf5a..722e04a 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -219,8 +219,8 @@ endif
 
 KBUILD_AFLAGS	+= $(cflags-y)
 KBUILD_CFLAGS	+= $(cflags-y)
-KBUILD_CPPFLAGS += -D"VMLINUX_LOAD_ADDRESS=$(load-y)"
-KBUILD_CPPFLAGS += -D"DATAOFFSET=$(if $(dataoffset-y),$(dataoffset-y),0)"
+KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
+KBUILD_CPPFLAGS += -DDATAOFFSET=$(if $(dataoffset-y),$(dataoffset-y),0)
 
 LDFLAGS			+= -m $(ld-emul)
 
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