usage: etcbuild [-h] [-e filename] [-p filename] [-d dirname]
                [--concurrency processes] [--disable-verification]
                [--no-cleanup] [--no-install] [-v]
                target [target ...]

Embedded toolchain build script.

positional arguments:
  target                Target(s) to build.

optional arguments:
  -h, --help            show this help message and exit
  -e filename, --envfile filename
                        Specifies an environment file; can be specified
                        multiple times (order matters, later options supersede
                        previous ones). Set of JSON files which define build
                        environment parameters such as the target or
                        installation directory.
  -p filename, --packages filename
                        Specifies package configuration file. Defaults to
                        packages.json.
  -d dirname, --package-dir dirname
                        Specifies subdirectory in which to store downloaded
                        package sources. Defaults to packages.
  --concurrency processes
                        Specifies number of concurrent processes to use.
                        Defaults to 12.
  --disable-verification
                        Disables verification of hashes of downloaded files.
                        Not recommended.
  --no-cleanup          By default, temporary files during the build process
                        are removed after the build is finished. This option
                        keeps them around.
  --no-install          Just build the packages, but do not install them.
  -v, --verbose         Increases verbosity. Can be specified multiple times
                        to increase.

$ ./etcbuild -e env_joe.json -e env_cortex_m3.json binutils

$ ./etcbuild -e env_joe.json -e env_cortex_m3.json binutils gcc gdb