Merge branch 'silent-custom' into maint

* silent-custom:
  silent: new $(AM_V_P) variable, tell if we're running in silent mode
  refactor: silent rules handling (a little)
  refactor: &define_verbose_var: accept a third optional argument

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

diff --cc NEWS
index b61d58a,bced15f..347287e
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -60,22 -60,12 +60,28 @@@ New in 1.12.2
      input file.  Such a warning will also be present in the next
      Autoconf version (2.70).
  
 +* Cleaning rules:
 +
 +  - Recursive cleaning rules descends into the $(SUBDIRS) in the natural
 +    order (as done by the other recursive rules), rather than in the
 +    inverse order.  They used to do that in order to work a round a
 +    limitation in an older implementation of the automatic dependency
 +    tracking support, but that limitation had been lifted years ago
 +    already, when the automatic dependency tracking based on side-effects
 +    of compilation had been introduced.
 +
 +  - Cleaning rules for compiled objects (both "plain" and libtool) work
 +    better when subdir objects are involved, not triggering a distinct
 +    'rm' invocation for each such object.  They do so by removing *any*
 +    compiled object file that is in the same directory of a subdir
 +    object.  See automake bug#10697.
 +
+ * Silent rules support:
+ 
+   - A new predefined $(AM_V_P) make variable is provided; it expands
+     to a shell conditional that can be used in recipes to know whether
+     make is being run in silent or verbose mode.
+ 
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  New in 1.12.1:

diff --cc automake.in
Simple merge

diff --cc doc/automake.texi
Simple merge

diff --cc t/list-of-tests.mk
Simple merge