[U-Boot] [PATCH V2] arm: config: enforce -fno-pic for gcc

[Tom Rini]

On Sat, Jan 30, 2016 at 12:10:49PM +0800, Peng Fan wrote:

> Android's tool chain enable the -mandroid at default.
> This option will enable the -fpic, which cause uboot compilation
> failure:
> "
>  LD      u-boot
>  u-boot contains unexpected relocations: R_ARM_ABS32
>  R_ARM_RELATIVE
> "
> 
> In my testcase, arm-linux-androideabi-gcc-4.9 internally
> enables '-fpic', so when compiling code, there will be
> relocation entries using type R_ARM_GOT_BREL and .got
> section. When linking all the built-in.o using ld, there
> will be R_ARM_ABS32 relocation entry and .got section
> in the final u-boot elf image. This can not be handled
> by u-boot, since u-boot only expects R_ARM_RELATIVE
> relocation entry.
> arm-poky-linux-gnueabi-gcc-4.9 default does not enable '-fpic',
> so there is not .got section and R_ARM_GOT_BREL in built-in.o.
> And in the final u-boot elf image, all relocation entries are
> R_ARM_RELATIVE.
> 
> we can pass '-fno-pic' to xxx-gcc to disable pic. whether
> the toolchain internally enables or disables pic, '-fno-pic'
> can work well.
> 
> Signed-off-by: Peng Fan <peng.fan at nxp.com>
> Cc: Albert Aribaud <albert.u.boot at aribaud.net>

Reviewed-by: Tom Rini <trini at konsulko.com>

-- 
Tom
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