1 &CAPS => subdir_CAPS or TOP_CAPS
5 &/ => subdir/ or nothing
8 &^ => $(top_srcdir)/subdir or $(top_srcdir)
9 &~ => $(abs_top_srcdir)/subdir or $(abs_top_srcdir)
14 & thing thing... & => each thing prefixed by &/ &^/ &~/ resp
15 & ^ thing thing... & each thing is any non-ws
16 & ~ thing thing... & & may be omitted before EOL or before \EOL
17 other &'s not recognised
19 start of line (maybe after ws):
20 &:<directive> <args>....
21 args are processed for & first
22 &:include filename filename should usually be foo.mk.in
25 CAPS is [A-Z][0-9_A-Z]*(?!\w)
26 lc is [a-z][-+,0-9_a-z]*(?!\w)
28 &!<spaces or tabs> disables & *until* EOL (and disappears)
30 &!STUFF<lwsp> STUFF is recognised instead of &
31 the terminating lwsp is discarded too
35 STUFF!& now & is recognised instead (ie back to normal)
39 &!@@@ @@@ is recognised instead of &
42 &TARGETS[_things] is handled specially
43 must be spelled precisely this way
44 if no _things, means _all
46 Also, `all' is weird in that it is present even if not specified