1.2 -c

Instructs the compiler to perform the compilation step, but not the link step.

Usage

ARM recommends using the -c option in projects with more than one source file.
The compiler creates one object file for each source file, with a .o file extension replacing the file extension on the input source file. For example, the following creates object files test1.o, test2.o, and test3.o:
armclang --target=aarch64-arm-none-eabi -c test1.c test2.c test3.c

Note

If you specify multiple source files with the -c option, the -o option results in an error. For example:
armclang --target=aarch64-arm-none-eabi -c test1.c test2.c -o test.o
armclang: error: cannot specify -o when generating multiple output files
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