-fno-common is NOT default

I'm using compiler

gcc-arm-8.2-2019.01-x86_64-aarch64-elf/bin/aarch64-elf-gcc

I found that the default for COMMON section is -fcommon, which will generate COMMON section, I have to use -fno-common explictly in CFLAGS.

But my understanding it should have -fno-common as defaut? Anything that changed?

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