GNU make memo

Variables memo

• Substitution. := or =
  • := is replaced when Makefile is read. Then the order matters. But it is explicit.
  • = is replaced when the variable is used. Then this is hard to use (for me).
• % wildcard
  • For dependency setting,

        dirs := foo bar baz
        $(dirs:%=%/all): base
            

    will replace the variable dirs to "foo/all bar/all baz/all". So, these dirs depends on the base.