[yocto] Problems building U-Boot for x86_64

[Khem Raj]

On 8/23/17 3:40 PM, Ferry Toth wrote:
> Op Wed, 23 Aug 2017 14:51:55 -0700, schreef Khem Raj:
> 
>> On 8/23/17 2:29 PM, Ferry Toth wrote:
>>> Ferry Toth wrote:
>>>
>>>> Khem Raj wrote:
>>>>
>>>>> On 8/22/17 11:41 PM, Ferry Toth wrote:
>>>>>> I am having trouble building a specific U-Boot version with Yocto.
>>>>>> Outside of Yocto on 64 bit Ubuntu 17.04 with multilib it builds
>>>>>> fine.
>>>>>>
>>>>>> I am extending meta-intel-edison to build a 64 bit Poke Morty, with
>>>>>> a vanilla 64-bit kernel (4.12). This is working quite well.
>>>>>>
>>>>>> My host is x86_64, the target is core2 with tune=core-64.
>>>>>>
>>>>>> Without 64bit tune I can build U-Boot fine. With 64bit it can not
>>>>>> link, appearently because it needs lbgcc.a
>>>>>
>>>>> what is exact error message ? is it while compiling host bits or
>>>>> target bits ?
>>>>
>>>> The failing line is:
>>>> x86_64-poky-linux-ld.bfd -Bsymbolic -Bsymbolic-functions -m elf_i386
>>>> --emit- relocs --wrap=__divdi3 --wrap=__udivdi3 --wrap=__moddi3
>>>> --wrap=__umoddi3 -- gc-sections -pie -Bstatic --no-dynamic-linker
>>>> -Ttext 0x01101000 -o u-boot -T u-boot.lds arch/x86/cpu/start.o
>>>> --start-group arch/x86/cpu/built-in.o arch/x86/lib/built-in.o
>>>> board/intel/edison/built-in.o cmd/built-in.o common/built-in.o
>>>> disk/built-in.o drivers/built-in.o drivers/dma/built-in.o
>>>> drivers/gpio/built-in.o drivers/i2c/built-in.o drivers/mmc/built-in.o
>>>> drivers/mtd/built-in.o drivers/mtd/onenand/built-in.o
>>>> drivers/mtd/spi/built- in.o drivers/net/built-in.o
>>>> drivers/net/phy/built-in.o drivers/pci/built- in.o
>>>> drivers/power/built-in.o drivers/power/battery/built-in.o
>>>> drivers/power/domain/built-in.o drivers/power/fuel_gauge/built-in.o
>>>> drivers/power/mfd/built-in.o drivers/power/pmic/built-in.o
>>>> drivers/power/regulator/built-in.o drivers/serial/built-in.o
>>>> drivers/spi/built-in.o drivers/usb/common/built-in.o
>>>> drivers/usb/dwc3/built- in.o drivers/usb/emul/built-in.o
>>>> drivers/usb/eth/built-in.o drivers/usb/gadget/built-in.o
>>>> drivers/usb/gadget/udc/built-in.o drivers/usb/host/built-in.o
>>>> drivers/usb/musb-new/built-in.o drivers/usb/musb/built-in.o
>>>> drivers/usb/phy/built-in.o drivers/usb/ulpi/built-in.o dts/built-in.o
>>>> fs/built-in.o lib/built-in.o net/built-in.o test/built-in.o
>>>> test/dm/built-in.o --end-group arch/x86/lib/lib.a -Map u-boot.map
>>>> ERROR: oe_runmake failed arch/x86/lib/built-in.o: In function
>>>> `__wrap___udivdi3':
>>>> /home/ferry/tmp/edison-intel/my/edison-
>>>> morty/out/linux64/build/tmp/work/edison-poky-linux/u-boot/edison-
> v2017.03-
>>>> r0/git/arch/x86/lib/gcc.c:25: undefined reference to
>>>> `__normal___udivdi3'
>>>
>>> I as believe the missing lib is libgcc.a I just my sysroot and found it
>>> here:
>>
>> the linker cmdline above does not link with libgcc and there might be a
>> good reason for that, many standalone applications dont link with libgcc
>> intentionally. You could look into the code and see if it can be written
>> differently such that gcc does not have to invoke a helper function from
>> gcc runtime. Another option is to link with libgcc explicitly
> 
> If change my setup to build for a 32bit target, it build u-boot without 
> error.

compiler may not be generating calls for the missing function.

> When I build the same git outside yocto on 64bit with multilib installed 
> it also builds without error. In that case the make command would be:
> make -j8 edison_defconfig

same is possible. Can you do readelf -sW gcc.o and see if there is a
undefined reference to __normal___udivdi3

> 
> My conclusion: I have some bb variable set to the wrong value or I need 
> to get multilib installed into /..../sysroots/x86_64-linux/lib.
> 
> So how to do that?
> 
>>> sysroots/lib32-edison/usr/lib/i686-pokymllib32-linux/6.2.0/
>>> sysroots/lib32-edison-tcbootstrap/usr/lib/i686-pokymllib32-linux/6.2.0/
>>> sysroots/edison/usr/lib64/x86_64-poky-linux/6.2.0/
>>> sysroots/edison-tcbootstrap/usr/lib64/x86_64-poky-linux/6.2.0/
>>>
>>> How compile log shows:
>>> NOTE: make -j8 CROSS_COMPILE=x86_64-poky-linux-
>>> CC=x86_64-poky-linux-gcc --sysroot=/..../sysroots/edison V=1 HOSTCC=gcc
>>> -isystem/..../sysroots/x86_64-linux/usr/include -O2 -pipe
>>> -L/..../sysroots/x86_64-linux/usr/lib -L/..../sysroots/x86_64-linux/lib
>>> -Wl,-rpath-link,/..../sysroots/x86_64-linux/usr/lib
>>> -Wl,-rpath-link,/..../sysroots/x86_64-linux/lib
>>> -Wl,-rpath,/..../sysroots/x86_64-linux/usr/lib
>>> -Wl,-rpath,/..../sysroots/x86_64-linux/lib -Wl,-O1 -C
>>> /..../out/linux64/build/tmp/work/edison-poky-linux/u-boot/edison-
>>> v2017.03-r0/git O=/..../out/linux64/build/tmp/work/edison-poky-linux/u-
>>> boot/edison-v2017.03-r0/build edison_defconfig
>>>
>>> (.... my edits to shorten the uninteresting part of the path)
>>>
>>> I would think: --sysroot points to /edison dir which actually contains
>>> libgcc.a, but -i, _l and -W1 options point to host dirs that don't have
>>> the lib.
>>>
>>>
>>>>>> I attempted to add multilib, but although that immediately exposed
>>>>>> bugs in other recipes but actually adds libgcc.a, it does that for
>>>>>> the target sysroot only.
>>>>>>
>>>>>> And for some reason, U-Boot is built with the native gcc
>>>>>> (x86_64-linux),
>>>>>> and multilib does not add libgcc.a to that sysroot.
>>>>>>
>>>>>> So, how do I add multilib to -native sysroot, preferably only to
>>>>>> -native and not to the target, as the target has not further use for
>>>>>> it?
>>>>>>
>>>>>> Strangest thing is in u-boot.inc there is:
>>>>>> EXTRA_OEMAKE = 'CROSS_COMPILE=${TARGET_PREFIX}
>>>>>> CC="${TARGET_PREFIX}gcc ${TOOLCHAIN_OPTIONS}" V=1'
>>>>>> EXTRA_OEMAKE += 'HOSTCC="${BUILD_CC} ${BUILD_CFLAGS}
>>>>>> ${BUILD_LDFLAGS}"'
>>>>>>
>>>>>> But when I check my log file:
>>>>>> NOTE: make -j8 CROSS_COMPILE=x86_64-poky-linux-
>>>>>> CC=x86_64-poky-linux- gcc  ......
>>>>>>
>>>>>> So TARGET_PREFIX resolves to x86_64-poky-linux, but I think my
>>>>>> target is core2_64 (or something like that). Is that normal for
>>>>>> U-Boot?
>>>>>
>>>>> thats ok.
>>>>>
>>>>>
>>>>>> I am a little lost, so any help would be greatly appreciated!
>>>>>>
>>>>>> Ferry
>>>>>>
>>>>>>
>>>>> --
>>>>
>>>>
>>>> --
> 
>