news: document new 'subdir-objects' warning

* NEWS: Automake 1.14 will warn if a subdir source file is
specified but the 'subdir-objects' option is not given.  This
is done to smooth the transition to Automake 2.0, which will
unconditionally assume the behaviour now given only with the
'subdir-objects' option.

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

diff --git a/NEWS b/NEWS
index 594bb85..53881df 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -95,6 +95,16 @@ New in 1.14:
     <http://debbugs.gnu.org/cgi/bugreport.cgi?bug=13378#35>
     <http://debbugs.gnu.org/cgi/bugreport.cgi?bug=13378#44>
 
+  - The next major Automake version (2.0) will unconditionally turn on
+    the 'subdir-objects' option.  I order to smooth out the transition,
+    we now give a warning (in the category 'unsupported') whenever a
+    source file is present in a subdirectory but the 'subdir-object' is
+    not enabled.  For example, the following usage will trigger such a
+    warning (of course, assuming the 'subdir-objects' option is off):
+
+        bin_PROGRAMS = sub/foo
+        sub_foo_SOURCES = sub/main.c sub/bar.c
+
   - Automake will automatically enhance the AC_PROG_CC autoconf macro
     to make it check, at configure time, that the C compiler supports
     the combined use of both the "-c -o" options.  This "rewrite" of