• Peng Fan's avatar
    arm: config: enforce -fno-pic for gcc · 397d7d5a
    Peng Fan authored
    
    
    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: default avatarPeng Fan <peng.fan@nxp.com>
    Cc: Albert Aribaud <albert.u.boot@aribaud.net>
    Reviewed-by: default avatarTom Rini <trini@konsulko.com>
    397d7d5a