Default to 'configure --enable-silent-rules'

This greatly shortens the 'make' output, making it more readable
and useful.  For example, on my platform it shortens a
4125-character line "gcc -std=gnu99 -c -Demacs -I. -I. -I../lib
... emacs.c" -- a line so long that it's hard to see what's going
on or where the diagnostics are -- to just "CC emacs.o".
* INSTALL: Document this.
* configure.ac: Add AM_SILENT_RULES([yes]).
(AM_DEFAULT_VERBOSITY): Remove now-unnecessary initialization.
* etc/NEWS: Document this.
Fixes: bug#19501

1 files changed, 3 insertions, 4 deletions

diff --git a/INSTALL b/INSTALL
index 1ed26985477..55320207fa3 100644
--- a/INSTALL
+++ b/INSTALL
@@ -316,10 +316,9 @@ generated warnings may still be useful, though you may prefer building
 with 'make WERROR_CFLAGS=' so that the warnings are not treated as
 errors.
 
-Use --enable-silent-rules to cause 'make' to chatter less.  This is
-helpful when combined with options like --enable-gcc-warnings that
-generate long shell-command lines.  'make V=0' also suppresses the
-chatter.
+Use --disable-silent-rules to cause 'make' to give more details about
+the commands it executes.  This can be helpful when debugging a build
+that goes awry.  'make V=1' also enables the extra chatter.
 
 Use --enable-link-time-optimization to enable link-time optimizer.  If
 you're using GNU compiler, this feature is supported since version 4.5.0.