cmd in Starlark

For running a command, we need

• the command (input file but exec config),
• the args (strings),
• the input files and their path

Repeated strings

cmd("gcc", "-o", out("main.o"), in("main.cc"))

cmd("gcc", "-o", out("main"), in("main.o"))

Strings as variables

main_o = "main.o"

cmd("gcc", "-o", out(main_o), in("main.cc"))

cmd("gcc", "-o", out("main"), in(main_o))