ARM Compiler armcc User Guide : 8.13 --asm

8.13 --asm

Instructs the compiler to write a listing to a file of the disassembly of the machine code generated by the compiler.

Object code is generated when this option is selected. The link step is also performed, unless the -c option is chosen.

To produce a disassembly of the machine code generated by the compiler, without generating object code, select -S instead of --asm.

The action of --asm, and the full name of the disassembly file produced, depends on the combination of options used:

Table 8-1 Compiling with the --asm option

Compiler option	Action
`--asm`	Writes a listing to a file of the disassembly of the compiled source. The link step is also performed, unless the `-c` option is used. The disassembly is written to a text file whose name defaults to the name of the input file with the filename extension `.s`.
`--asm -c`	As for `--asm`, except that the link step is not performed.
`--asm --interleave`	As for `--asm`, except that the source code is interleaved with the disassembly. The disassembly is written to a text file whose name defaults to the name of the input file with the filename extension `.txt`.
`--asm --multifile`	As for `--asm`, except that the compiler produces empty object files for the files merged into the main file.
`--asm -o filename`	As for `--asm`, except that the object file is named filename. The disassembly is written to the file filename.s. The name of the object file must not have the filename extension `.s`. If the filename extension of the object file is `.s`, the disassembly is written over the top of the object file.

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