U-boot is broken with -O0?

[Oleh Kravchenko]

Hello guys!

I think the CI verification job for u-boot patches should be updated to include CFLAGS like -O0
Because I'm not able to build u-boot for Raspberry Pi (or to another board) with -O0

Here the commands how to quickly reprodice the problem:
    export ARCH=arm64
    export CROSS_COMPILE=aarch64-linux-gnueabi-
    export KCFLAGS=-O0
    make rpi_4_defconfig
    make -j$(nproc)

I've attached part of the build log to this email.

P.S.:
Sorry if I've added you to CC by mistake.
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