9.4 --arm

Targets the ARM instruction set. The assembler is permitted to generate both ARM and Thumb code, but recognizes that ARM code is preferred.

This option instructs the assembler to interpret instructions as ARM instructions. It does not, however, guarantee ARM-only code in the object file. This is the default. Using this option is equivalent to specifying the ARM or CODE32 directive at the start of the source file.
Related reference
9.5 --arm_only
12.7 ARM or CODE32
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