3.3 Long Command Lines
The
driver can be passed a
command-line file containing driver options and arguments to circumvent any
operating-system-imposed limitation on command line length.pic-as
A command file is specified by the @
symbol, which should
be immediately followed (i.e., no intermediate space character) by the name of the file
containing the arguments. This same system of argument passing can be used by most of the
internal applications called by the compiler driver.
Inside the file, each argument must be separated by one or more spaces and can extend over several lines when using a backslash-return sequence. The file can contain blank lines, which will be ignored.
The following is the content of a command file, xyz.xc8 for example, that was constructed in a text editor and that contains the options and the file names required to compile a project.
-mcpu=18F26K40 -Wl,-Map=proj.map -Wa,-a \
main.S isr.S
After this file is saved, the compiler can be invoked with the following command:
pic-as
@xyz.xc8
Command files can be used as a simple alternative to a make file and utility, and can conveniently store compiler options and source file names. The MPLAB X IDE also allows such files to be used. The file name is specified in the
field of the Project Properties.