[U-Boot] imx6 devices failing to build with 2016.05

[Peter Robinson]

Hi All,

I didn't look closely when it happened with rc1 because I saw a pull
req from Stefano shortly afterwards and I decided to try again after
that landed. With rc3 I'm still seeing the same issue.

Basically all the i.MX6 devices
(cm_fx6,mx6cuboxi,novena,riotboard,udoo,wandboard,warp) we currently
build for Fedora are failing to build. It looks very similar to some
64 bit math issues [1] [2] a search gives me although from the linker
command I'm failing to see what code is at fault so any assistance in
debugging this would be great. I've checked it failed on < gcc6 too
and 2016.03 builds so it appears a regression in 05rcX.

The (for cuboxi example) basic error is:
  ld.bfd   -pie  --gc-sections -Bstatic -Ttext 0x17800000 -o u-boot -T
u-boot.lds arch/arm/cpu/armv7/start.o --start-group
arch/arm/cpu/built-in.o  arch/arm/cpu/armv7/built-in.o
arch/arm/imx-common/built-in.o  arch/arm/lib/built-in.o
board/solidrun/mx6cuboxi/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/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  fs/built-in.o
 lib/built-in.o  net/built-in.o  test/built-in.o  test/dm/built-in.o
--end-group arch/arm/lib/eabi_compat.o  -L
/usr/lib/gcc/armv7hl-redhat-linux-gnueabi/6.0.0 -lgcc -Map u-boot.map
ld.bfd: error: /usr/lib/gcc/armv7hl-redhat-linux-gnueabi/6.0.0/libgcc.a(_udivmoddi4.o)
uses VFP register arguments, u-boot does not
ld.bfd: failed to merge target specific data of file
/usr/lib/gcc/armv7hl-redhat-linux-gnueabi/6.0.0/libgcc.a(_udivmoddi4.o)

Full log at https://pbrobinson.fedorapeople.org/u-boot-mx6cuboxi-fail.txt

Peter

[1] http://u-boot.10912.n7.nabble.com/Cannot-compile-arm-u-boot-with-hardfloat-toolchain-td200647.html
[2] http://lists.denx.de/pipermail/u-boot/2015-June/216480.html