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

5 files changed, 28 insertions, 7 deletions

diff --git a/ChangeLog b/ChangeLog
index ceceb68e9dc..cca9100ddf7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2015-01-11  Paul Eggert  <eggert@cs.ucla.edu>
+
+        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.
+        Fixes: bug#19501
+
 2015-01-06  Paul Eggert  <eggert@cs.ucla.edu>
 
         Merge from gnulib
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.
diff --git a/configure.ac b/configure.ac
index e09b2892269..4cad214e928 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1011,9 +1011,11 @@ if test "${enableval}" != "no"; then
    fi
 fi)
 
+dnl Prefer silent make output.  For verbose output, use
+dnl 'configure --disable-silent-rules' or 'make V=1' .
+AM_SILENT_RULES([yes])
 dnl Port to Automake 1.11.
 dnl This section can be removed once we assume Automake 1.14 or later.
-: ${AM_DEFAULT_VERBOSITY=1}
 : ${AM_V=$AM_DEFAULT_VERBOSITY}
 : ${AM_DEFAULT_V=$AM_DEFAULT_VERBOSITY}
 AC_SUBST([AM_V])
diff --git a/etc/ChangeLog b/etc/ChangeLog
index 7a27312db85..20f88bdecc3 100644
--- a/etc/ChangeLog
+++ b/etc/ChangeLog
@@ -1,3 +1,8 @@
+2015-01-11  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Default to 'configure --enable-silent-rules'
+        * NEWS: Document this.
+
 2015-01-10  Daniel Colascione  <dancol@dancol.org>
 
         * NEWS: Fix typo
diff --git a/etc/NEWS b/etc/NEWS
index 59d90ababc8..b3267e1ce60 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -40,8 +40,10 @@ or by sticking with Emacs 24.4.
 ** The configure option `--with-pkg-config-prog' has been removed.
 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
 
-** The configure option '--enable-silent-rules' and the command
-'make V=0' now do a better job of suppressing chatter.
+** The configure option '--enable-silent-rules' is now the default,
+and silent rules are now quieter.  To get the old behavior where
+'make' chatters a lot, configure with '--disable-silent-rules' or
+build with 'make V=1'.
 
 ---
 ** The `grep-changelog' script (and its manual page) are no longer included.