--show_cmdline assembler option
Outputs the command line used by the assembler.
Shows the command line after processing by the assembler, and can be useful to check:
The command line a build system is using.
How the assembler is interpreting the supplied command line, for example, the ordering of command-line options.
The commands are shown normalized, and the contents of any via files are expanded.
The output is sent to the standard error stream (stderr).