&:include subdirmk/clean.sd.mk
For example you could put that in Perdir.sd.mk.
+The top-level Subdir.sd.mk is the first makefile included after the
+autogenerated `main.mk' which merely has some basic settings and
+includes. So if you want to get in early and set global variables,
+put them near the top of Subdir.sd.mk.
+
+subdirmk's filter script itself sets (only) these variables:
+ top_srcdir
+ abs_top_srcdir
+ SUBDIRMK_MAKEFILES
+ MAKEFILE_TEMPLATES
+You are likely to want to define $(PWD), and shorter names for
+top_srdir and abs_top_srcdir (we suggest $(src) and $(abs_src)).
+
Global definitions
------------------
(ii) In (or relative to) the subdirectory to which this Subdir.sd.mk
relates, or relative to the project's top level ?
- (iii) Absolute or relative pathname ?
- (Usually relative pathnames suffice.)
+ (iii) Absolute or relative pathname ? Usually relative pathnames
+ suffice. Where an absolute pathname is needed, it can be built
+ out of &/ and an appropriate make variable such as $(PWD).
Path construction &-expansions are built from the following:
- Relative paths in... Absolute paths in...
- build source build source
+ Relative paths in...
+ build source
- This directory & &, &@ &@,
- Top level . &; &@. &@;
+ This directory & &^
+ Top level . &~
-In more detail, with the various options for what comes next:
+In more detail, with all the various options laid out:
Recommended Relative paths in... Absolute paths in...
- for build source build source
+ for build source build source
- This lc &file &,file &@file &@,file
- directory any &/file &,/file &@/file &@,/file
- several & f g h &, f g h &@ f g h &@, f g h
+ This lc &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 &@.file &@;file
- level any file &;/file &@./file &@;/file
- several f g h &; f g h &@. f g h &@; f g h
- .mk.in file $(src)/file $(abs)/file $(abs_src)/file
+ Top lc file &~file
+ level any file &~/file $(PWD)/file $(abs_src)/file
+ .mk.in file $(src)/file $(PWD)/file $(abs_src)/file
+ several f g h &~ f g h $(addprefix...)
+
+(This assumes you have appropriate make variables src, PWD and
+abs_src.)
Substitution syntax
-------------------
&/ => sub/dir/ or nothing
&=/ => sub/dir or .
-&,lc => $(top_srcdir)/sub/dir/lc &,/ => $(top_srcdir)/sub/dir/
-&;lc => $(top_srcdir)/lc &;/ => $(top_srcdir)/
+&^lc => $(top_srcdir)/sub/dir/lc
+&^/ => $(top_srcdir)/sub/dir/
-&@lc => $(PWD)/sub/dir/lc &@/ => $(PWD)/sub/dir/
-&@.lc => $(PWD)/lc &@./ => $(PWD)/
-&@,lc => $(abs_top_srcdir)/sub/dir/lc &@,/ => $(abs_top_srcdir)/sub/dir/
-&@;lc => $(abs_top_srcdir)/lc &@;/ => $(abs_top_srcdir)/
+&~lc => $(top_srcdir)/lc
+&~/ => $(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
- . pathname of this directory in build tree, `@' must be specified
- @ absolute pathnames
+ = 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 | '/' ]
-
- To avoid incomprehensible .sd.mk files, some combinations are not
- allowed. For example `&=./' would mean `.' and `&./' would be the
- empty string. Variations with `=' and one of `@' `,' `;' are
- uncommon and must be written using make variables instead.
+ '&' [ '^' | '~' ] [ lc | '/' ]
&& => && for convenience in shell runes
\& => & general escaping mechanism
-& thing thing... & &@ thing thing... &
- &. thing thing... &
-&, thing thing... & &@, thing thing... &
-&; thing thing... & &@; thing thing... &
+& thing thing... &
+&^ thing thing... &
+&~ thing thing... &
Convenience syntax for prefixing multiple filenames.
Introduced by & followed by lwsp where lc could go.
Each lwsp-separated non-ws word is prefixed by &/ etc.