[U-Boot] GCC5.x support for old u-boot version

[Jeroen Hofstee <dasuboot@myspectrum.nl>]

Hello Ayoub,

On 25-11-15 10:35, Ayoub Zaki wrote:
> we have an am335x based custom board that use for our Project.
> At the moment only a customized version of uboot-2013.01.01 supports this
> board.
> As we use Yocto toolchains and we plan to upgrade to latest Yocto-2.0 that
> comes with GCC5.2.
>
> I would like to be able to build this custom old version with newer
> toolchains.
>
> For that I added from new u-boot the file :
>   include/linux/compiler-gcc5.h
>
> But still having some compile errors :
>
> | arm-poky-linux-gnueabi-gcc  --sysroot=/yocto/build/tmp/sysroots/shc  -g
> -Os   -fno-common -ffixed-r8 -msoft-float  -D__KERNEL__
> -DCONFIG_SYS_TEXT_BASE=0x80800000 -DCONFIG_SPL_TEXT_BASE=0x402F0400
> -I/yocto/build/tmp/work/shc-poky-linux-gnueabi/u-boot-shc/1.0-r1/git/include
> -fno-builtin -ffreestanding -nostdinc -isystem
> /yocto/build/tmp/sysroots/x86_64-linux/usr/lib/arm-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/5.2.0/include
> -pipe  -DCONFIG_ARM -D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux
> -march=armv7-a -mcpu=cortex-a8 -Wall -Wstrict-prototypes
> -fno-stack-protector -Wno-format-nonliteral -Wno-format-security
> -fstack-usage     -o s_record.o s_record.c -c
> | main.c:62:6: error: 'show_boot_progress' aliased to external symbol
> '__show_boot_progress'
> |  void show_boot_progress (int val) __attribute__((weak,
> alias("__show_boot_progress")));
> |       ^
> | make[1]: *** [main.o] Error 1
> | make[1]: Leaving directory
> `/yocto/build/tmp/work/shc-poky-linux-gnueabi/u-boot/1.0-r1/git/common'
> | make: *** [common/libcommon.o] Error 2
>
> Any chance to backport GCC5 support to old u-boot version ?

Perhaps this helps "inline: use the gcc inline version instead of the 
c99 one."
http://lists.denx.de/pipermail/u-boot/2014-May/180709.html

Regards,
Jeroen