On Tuesday 02 December 2014 20:34:59 Shawn Guo wrote:
> On Tue, Dec 02, 2014 at 06:29:52PM +0800, Jisheng Zhang wrote:
> > On Tue, 2 Dec 2014 02:24:03 -0800
> > Arnd Bergmann <[email protected]> wrote:
> > > Yes, that's definitely possible. Any idea how the android folks build
> > > their
> > > kernel?
> >
> > copied from https://android.googlesource.com/toolchain/build/+/HEAD/README
> >
> > The Android toolchain supports the following targets:
> > a. arm-linux-androideabi
> > b. arm-eabi (for Android kernel)
> > c. arm-newlib-eabi (for runnng gcc regression tests)
> > d. i[3456]86-*-linux-gnu, x86_64-*-linux-gnu (for x86 targets)
> >
> > So they build android kernel using the arm-eabi- toolchain.
>
> Thanks Jisheng for all the information.
>
> Yes, I just built my kernel with arm-eabi in
> android-toolchain-eabi-4.9-2014.09
> and it works fine. So we basically conclude that we should build kernel
> with arm-eabi rather than arm-linux-androideabi.
>
> One thing to note - with CONFIG_ARM_UNWIND turned on, even arm-eabi
> generate the following warning. This is one difference between android
> arm-eabi and arm-linux-gnueabi we can see immediately.
>
> LD vmlinux
> arm-eabi-ld: warning: unwinding may not work because EXIDX input section 31
> of fs/built-in.o is not in EXIDX output section
> arm-eabi-ld: warning: unwinding may not work because EXIDX input section 12
> of crypto/built-in.o is not in EXIDX output section
> arm-eabi-ld: warning: unwinding may not work because EXIDX input section 27
> of block/built-in.o is not in EXIDX output section
> arm-eabi-ld: warning: unwinding may not work because EXIDX input section 27
> of drivers/built-in.o is not in EXIDX output section
> arm-eabi-ld: warning: unwinding may not work because EXIDX input section 33
> of net/built-in.o is not in EXIDX output section
I looked into this before, I think this is a gold specific warning
about an actual kernel bug, but I haven't been able to track it down.
It certainly happens with my regular toolchain and gold as well.
Arnd
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