Adding this here because Google didn’t show very obvious matches for this problem.

I was trying to build a recent u-boot (for olinuxino-lime2), with the Ubuntu 16.04 supplied arm-linux-gnueabihf-as as supplied in package binutils-arm-linux-gnueabihf 2.26-8ubuntu2.1 that was installed as a dependency with apt-get install gcc-arm-linux-gnueabihf 4:5.3.1-1ubuntu1. I then got the following error:

  CC      arch/arm/cpu/armv7/sunxi/psci.o
{standard input}: Assembler messages:
{standard input}:302: Error: push/pop do not support {reglist}^ -- `pop {r0,r1,r2,r3,r4,r9,ip,pc}^'
scripts/Makefile.build:280: recipe for target 'arch/arm/cpu/armv7/sunxi/psci.o' failed
make[2]: *** [arch/arm/cpu/armv7/sunxi/psci.o] Error 1
scripts/Makefile.build:425: recipe for target 'arch/arm/cpu/armv7/sunxi' failed
make[1]: *** [arch/arm/cpu/armv7/sunxi] Error 2
Makefile:1210: recipe for target 'arch/arm/cpu/armv7' failed
make: *** [arch/arm/cpu/armv7] Error 2

This appears out to be due to a bug in gcc, possibly https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70830. I had better luck with Linaro’s https://releases.linaro.org/components/toolchain/binaries/5.3-2016.02/arm-linux-gnueabihf/gcc-linaro-5.3-2016.02-x86_64_arm-linux-gnueabihf.tar.xz as mentioned by Robert Nelson.