What does this compiler flag achieve?

In the code for building applications for a vendor driver, I see the following directive:

SAMPLE_CFLAGS   = -Wall -m32

I am not sure I quite understand what the option -m32 stands for?

I googled for the same and the closest I got was the following link, which refers to the flag -m64 but provides no description:

CPP/C++ Compiler Flags and Options

Can someone provide an explanation?

Read more here: https://stackoverflow.com/questions/68478734/what-does-this-compiler-flag-achieve

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