provides the filenames of one or more text files
containing C or C++ source code. By default, the compiler looks
for source files and creates output files in the current directory.
If a source file is an assembly file, that is, one with an
extension of .s, the compiler activates the ARM
assembler to process the source file.
When you invoke the compiler, you normally specify one or
more source files. However, a minority of compiler command-line
options do not require you to specify a source file. For example, armcc --version_number.