X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?p=subdirmk.git;a=blobdiff_plain;f=README;h=360afbd351686e5f2d0ebfde1a486d5ac4967b40;hp=4da40911ce83909e880874de657b6d4db797992b;hb=e93eb68eb1bad1f9208ab66e8c07f1a57b5d06ce;hpb=8c6b02849c6918f1deac8e463b24335844d65b86

diff --git a/README b/README
index 4da4091..360afbd 100644
--- a/README
+++ b/README
@@ -250,6 +250,10 @@ So pathname syntax is a subset of:
 
 &\&		=>	&		general escaping mechanism
 &\$		=>	$
+&\NEWLINE				eats the newline and vanishes
+
+&$VARIABLE	=>	$(sub_dir_VARIABLE)	or $(TOP_VARIABLE)
+	VARIABLE is ASCII starting with a letter and matching \w+
 
 & thing thing... &
 &^ thing thing... &
@@ -263,11 +267,11 @@ So pathname syntax is a subset of:
 
 &:<directive> <args>....
 	recognised at start of line only (possibly after lwsp)
-	args are processed for &
 
-&:include filename		filename should usually be foo.sd.mk
+&:include filename		filename should usually be [&]foo.sd.mk
 &:-include filename		tolerate nonexistent file
 	filenames are relative to $(top_srcdir)
+	RHS is &-expanded
 
 &!<lwsp>	disables & until EOL (and then disappears)
 
@@ -288,10 +292,12 @@ So pathname syntax is a subset of:
 	Notably
 		NEWQUOTENEWQUOTE	=> NEWQUOTENEWQUOTE
 		NEWQUOTE\NEWQUOTE	=> NEWQUOTE
+		NEWQUOTE\$		=> $
 		NEWQUOTE:changequote &	set escape back to &
 
 &TARGETS_things
-	Handled specially.  If mentioned, declares that this
+	Handled specially.  If mentioned at the start of a line
+	(possibly following whitespace), declares that this
 	subdir ought to have a target `things'.  The rule will be
 		&/things:: $(&TARGETS_things)
 
@@ -305,9 +311,9 @@ So pathname syntax is a subset of:
 	which recursively implies this directory's `things'.
 
 	Must be spelled exactly &TARGETS_things.  &_TARGETS_things,
-	for example, is not magic.  But mentioning &TARGETS_things in
-	a #-comment *does* work because the & filter does not care
-	about comments.
+	for example, is not magic.  To make the target exist
+	without providing any prerequisites for it, write a line
+	containing just `&TARGETS_things +='.
 
 	`all' is extra special: every directory has an `all'
 	target, which corresponds to &TARGETS.