// Compiler template
local CCompiler = {
  cFlags: [],
  out: "a.out",
  local flags_str = std.join(" ", self.cFlags),
  local files_str = std.join(" ", self.files),
  cmd: "%s %s %s -o %s" % [self.compiler, flags_str, files_str, self.out],
};

// GCC specialization
local Gcc = CCompiler { compiler: "gcc" };

// Another specialization
local Clang = CCompiler { compiler: "clang" };

// Mixins - append flags
local Opt = { cFlags: super.cFlags + ["-O3", "-DNDEBUG"] };
local Dbg = { cFlags: super.cFlags + ["-g"] };

// Output:
{
  targets: [
    Gcc { files: ["a.c", "b.c"] },
    Clang { files: ["test.c"], out: "test" },
    Clang + Opt { files: ["test2.c"], out: "test2" },
    Gcc + Opt + Dbg { files: ["foo.c", "bar.c"], out: "baz" },
  ]
}