linux-kernel - Re: fstat suddenly return -EINVAL [Was: Bus error on make allyesconfig, kernelbuild with HEAD]

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Message-ID: <20101108190501.GA26866@merkur.ravnborg.org>
Date:	Mon, 8 Nov 2010 20:05:01 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Ben Gamari <bgamari.foss@...il.com>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	Christoph Egger <siccegge@...fau.de>,
	linux-kernel@...r.kernel.org,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	Michal Marek <mmarek@...e.cz>
Subject: Re: fstat suddenly return -EINVAL [Was: Bus error on make
	allyesconfig, kernelbuild with HEAD]

> >
> fstat appears to be failing for every file (the file= line is printed
> right before the fstat; there seems to be a corresponding error for
> every file= so I'm inferring that it must always fail):
> 
> $ make
>   HOSTCC  scripts/basic/fixdep
> file=scripts/basic/.fixdep.d
> fixdep: fstat failed: Invalid argument

But open succedd - because we see no output from that one.

> It actually seems as if the problem might be that none of these files
> actually exist:
> 
> $ find scripts -iname .*.d
> $
> 
> How are .d files supposed to be generated?

They are generated by kbuild.
See scripts/Kbuild.include:

# Execute the command and also postprocess generated .d dependencies file.
if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ),                  \
        @set -e;                                                             \
        $(echo-cmd) $(cmd_$(1));                                             \
        scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
==>     rm -f $(depfile);                                                    \
        mv -f $(dot-target).tmp $(dot-target).cmd)


If you delete the line marked "==>" then you should have .d files are a build.

> > From your previous posting it looks like you have some special setting
> > that impact your choice of HOST gcc.
> > Do you define HOSTCC somewhere?
> > 
> I don't think I do define HOSTCC anywhere. My cross compilation
> environment is as follows,
> 
> source /usr/local/angstrom/arm/environment-setup
> export ARCH=arm
> export CROSS_COMPILE=arm-angstrom-linux-gnueabi-
So far it looks OK.

> export CC=${CROSS_COMPILE}gcc
> export CXX=${CROSS_COMPILE}g++
This part is wrong. The kernel will do this for you.
It should not cause any harm...

> 
> OE_ENV_ROOT=/home/bgamari/OE/angstrom-dev
> SYSROOT=$OE_ENV_ROOT/sysroots/armv7a-angstrom-linux-gnueabi
> export LD_LIBRARY_PATH=$SYSROOT/lib:$SYSROOT/usr/lib
> export CFLAGS=-I$OE_ROOT/lib/gcc/arm-angstrom-linux-gnueabi/4.3.1/include

These looks unrelated.

	Sam
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