smake

• There is no setRule command. target accepts patterns as well as names and they're treated the same, resulting in shorter code and easier usage.
• There is no upTarget command. The whole stack of targets built is available in the local variable stack.
• Exec is now called system and has options to be quiet and to ignore errors (a la make)
• Target changed is more inline with the traditional make. There are four cases when a target is considered changed:
  • when the code does a return 1
  • when any dependency is built
  • when a dependency is not built, but is a file with an older timestamp than the target
  • when the target does not exist as a file at the end of the code.
• Targets built once are not built again in the same session (like make)
• target allows multiple targets (for convenience), just like each of them had been specified separately with the same body.

And to a lesser extent

• (commentable) auto logging of commands run
• accept multiple targets on command line
• allow definition of global variables on the command line
• allow definition of environment variables on the command line
• single file (< 300 lines) with no external dependencies
• new commands
  • dputs (for debug)
  • log (for logging)
  • tcl (print command before running).
• no compile and link commands (not really core)