X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?a=blobdiff_plain;f=README;h=006b57f62eaeacb6cb0927dcfe67b3968121e15b;hb=c6e0abe539310d9c3a612dd92f59d106aa8674c7;hp=6c9e76b626d1087ce23b8488b1b784ec2f67c06e;hpb=afecfed56c97d5870f82706e84db5473c5f383f4;p=subdirmk.git

diff --git a/README b/README
index 6c9e76b..006b57f 100644
--- a/README
+++ b/README
@@ -183,7 +183,7 @@ In more detail, with all the various options laid out:
              for      build     source       build         source
                                                        
   This       lc       &file     &^file       $(PWD)/&file  $(abs_src)/&file
-  directory  any      &/file    &^/file      $(PWD)&/file  $(abs_src)/&/file
+  directory  any      &/file    &^/file      $(PWD)/&/file $(abs_src)/&/file
              several  & f g h   &^ f g h     $(addprefix...)
                                              
   Top        lc       file      &~file
@@ -231,14 +231,14 @@ empty string).
 &~/		=>	$(top_srcdir)/
 
 In general:
-    =	return subdir without delimiter (not allowed with `,' `;')
-    ,   pathname of this subdirectory in source tree
-    ;   pathname of top level of source tree
+    =	return subdir without delimiter (not allowed with `^' `~')
+    ^   pathname of this subdirectory in source tree
+    ~   pathname of top level of source tree
     /	terminates the escape (needed if next is not lwsp or space)
   lwsp  starts multi-word processing (see below)
 
 So pathname syntax is a subset of:
-    '&' [ ',' | ';' ] [ lc | '/' ]
+    '&' [ '^' | '~' ] [ lc | '/' ]
 
 &&		=>	&&		for convenience in shell runes
 \&		=>	&		general escaping mechanism
@@ -266,11 +266,11 @@ So pathname syntax is a subset of:
 &#	delete everything to end of line
 	(useful if the RHS contains unrecognised & constructions)
 
-&!STUFF
+&:changequote STUFF
 	changes the escape sequence from & to literally STUFF
 	STUFF may be any series of of non-whitespace characters,
-	and is terminated by EOL or lwsp.  &!STUFF and the lwsp
-	are discarded.
+	and is terminated by EOL or lwsp.  The whole line is
+	discarded.
 
 	After this, write STUFF instead of &, everywhere.
 	The effect is global and lasts until the next setting.
@@ -278,9 +278,9 @@ So pathname syntax is a subset of:
 	it back before using &:include.
 
 	Notably
-		STUFFSTUFF	=>	STUFFSTUFF
-		\STUFF		=>	STUFF
-		STUFF!&		set escape back to &
+		STUFFSTUFF		=> STUFFSTUFF
+		\STUFF			=> STUFF
+		STUFF:changequote &	=> set escape back to &
 
 &TARGETS_things
 	Handled specially.  If mentioned, declares that this
@@ -371,6 +371,13 @@ makefiles, you may find that just `make' is broken now and cannot get
 far enough to regenerate a working set of makefiles.  If this happens
 just rerun ./config.status by hand.
 
+If you go back and forth between different versions of your code you
+can sometimes find that `make' complains that one of your Subdir.sd.mk
+files is missing: typically, if iot was used and therefore a
+dependency in some other version of your code.  If you run `make
+clean' (or `make realclean') these dependencies are suppressed, which
+will clear up the problem.
+
 
 Legal information
 -----------------