Support the .EXTRA_PREREQS special variable

Initial implementation by Christof Warlich <cwarlich@gmx.de>

* NEWS: Announce the new feature.
* doc/make.texi (Other Special Variables): Document .EXTRA_PREREQS.
* src/dep.h (struct dep): New flag to note extra prereq deps.
* src/filedef.h (expand_extra_prereqs): Declare a function to expand
the value of .EXTRA_PREREQS.
* src/file.c (expand_extra_prereqs): Given a struct variable lookup
of .EXTRA_PREREQS, convert it into a list of deps and for each one
make sure it has a struct file and has the new flag set.
(snap_file): A new function invoked by hash_map that will perform
per-file operations: set up second expansion, intermediate, and also
.EXTRA_PREREQS.  Manage circular dependencies by ignoring them.
(snap_deps): Defer per-file operations until the end.  Look up the
global .EXTRA_PREREQS and pass it along to snap_file for each file.
* src/implicit.c (struct patdeps): Remember the extra prereqs flag.
(pattern_search): Transfer extra prereqs flag settings into the
matched pattern rule.
* src/rule.h (snap_implicit_rules): Rename count_implicit_rules to
snap_implicit_rules since we now do more than count.
* src/rule.c (snap_implicit_rules): As we walk through all the pattern
rules, add in any global .EXTRA_PREREQS to the dep list.  Ensure we
take them into account for the max number of prereqs and name length.
* src/main.c (main): Add extra-prereqs to .FEATURES.
Call the renamed snap_implicit_rules.
* tests/scripts/variables/EXTRA_PREREQS: Add tests.

1 files changed, 1 insertions, 0 deletions

diff --git a/AUTHORS b/AUTHORS
index f3c83c61..284c530f 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -68,6 +68,7 @@ Other contributors:
   David Boyce <dsb@boyski.com>
   Frank Heckenbach <f.heckenbach@fh-soft.de>
   Kaz Kylheku <kaz@kylheku.com>
+  Christof Warlich <cwarlich@gmx.de>
 
 With suggestions/comments/bug reports from a cast of ... well ...
 hundreds, anyway :)