Add system-configuration-features, summarising some configure results

* configure.ac (ACL_SUMMARY): Rename from acl_summary, for consistency.
(EMACS_CONFIG_FEATURES): New define.

* src/emacs.c (syms_of_emacs) <system-configuration-features>: New var.

* lisp/mail/emacsbug.el (report-emacs-bug):
Include system-configuration-features.

* etc/NEWS: Mention this.

7 files changed, 49 insertions, 7 deletions

diff --git a/ChangeLog b/ChangeLog
index adc1768b0ce..f8c4c599cd6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2014-03-28  Glenn Morris  <rgm@gnu.org>
+
+	* configure.ac (ACL_SUMMARY): Rename from acl_summary, for consistency.
+	(EMACS_CONFIG_FEATURES): New define.
+
 2014-03-27  Paul Eggert  <eggert@cs.ucla.edu>
 
 	* configure.ac: Suggest './configure MAKE=gmake' in diagnostic.
diff --git a/configure.ac b/configure.ac
index e1d6fc249a4..1b622c9de3c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4925,9 +4925,9 @@ if test "${HAVE_GTK}" = "yes"; then
 fi
 
 if test $USE_ACL -ne 0; then
-  acl_summary="yes $LIB_ACL"
+  ACL_SUMMARY="yes $LIB_ACL"
 else
-  acl_summary=no
+  ACL_SUMMARY=no
 fi
 
 echo "
@@ -4952,6 +4952,23 @@ else
 echo "  Where do we find X Windows libraries?                   Standard dirs"
 fi
 
+optsep=
+emacs_config_features=
+for opt in XAW3D XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS \
+  GCONF GSETTINGS NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT \
+  LIBOTF XFT ZLIB; do
+
+    case $opt in
+      NOTIFY|ACL) eval val=\${${opt}_SUMMARY} ;;
+      *) eval val=\${HAVE_$opt} ;;
+    esac
+    test x"$val" = xno && continue
+    AS_VAR_APPEND([emacs_config_features], ["$optsep$opt"])
+    optsep=' '
+done
+AC_DEFINE_UNQUOTED(EMACS_CONFIG_FEATURES, "${emacs_config_features}",
+  [Summary of some of the main features enabled by configure.])
+
 echo "  Does Emacs use -lXaw3d?                                 ${HAVE_XAW3D}"
 echo "  Does Emacs use -lXpm?                                   ${HAVE_XPM}"
 echo "  Does Emacs use -ljpeg?                                  ${HAVE_JPEG}"
@@ -4968,7 +4985,7 @@ echo "  Does Emacs use -ldbus?                                  ${HAVE_DBUS}"
 echo "  Does Emacs use -lgconf?                                 ${HAVE_GCONF}"
 echo "  Does Emacs use GSettings?                               ${HAVE_GSETTINGS}"
 echo "  Does Emacs use a file notification library?             ${NOTIFY_SUMMARY}"
-echo "  Does Emacs use access control lists?                    ${acl_summary}"
+echo "  Does Emacs use access control lists?                    ${ACL_SUMMARY}"
 echo "  Does Emacs use -lselinux?                               ${HAVE_LIBSELINUX}"
 echo "  Does Emacs use -lgnutls?                                ${HAVE_GNUTLS}"
 echo "  Does Emacs use -lxml2?                                  ${HAVE_LIBXML2}"
diff --git a/etc/NEWS b/etc/NEWS
index 0265f2604bf..4da6aafd7ec 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -41,6 +41,11 @@ otherwise leave it unmarked.
 The function `tty-run-terminal-initialization' consults this variable
 when deciding what terminal-specific initialization code to run.
 
+---
+** New variable `system-configuration-features', listing some of the
+main features that Emacs was compiled with.  This is mainly intended
+for use in Emacs bug reports.
+
 
 * Editing Changes in Emacs 24.5
 
diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index ee50bed6209..24f17f004f5 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,12 +1,15 @@
+2014-03-28  Glenn Morris  <rgm@gnu.org>
+
+	* mail/emacsbug.el (report-emacs-bug):
+	Include system-configuration-features.
+
 2014-03-28  Michal Nazarewicz  <mina86@mina86.com>
 
 	* simple.el (cycle-spacing): Never delete spaces on first run by
 	default, but do so in a new 'fast mode and if there are already
 	N spaces (the previous behaviour).
-
 	Compare N with its value in previous invocation so that changing
 	prefix argument restarts `cycle-spacing' sequence.
-
 	The idea is that with this change, binding M-SPC to
 	`cycle-spacing' should not introduce any changes in behaviour of
 	the binding so long as users do not type M-SPC twice in a raw with
diff --git a/lisp/mail/emacsbug.el b/lisp/mail/emacsbug.el
index b994949e94d..54f7b6a21ea 100644
--- a/lisp/mail/emacsbug.el
+++ b/lisp/mail/emacsbug.el
@@ -1,7 +1,7 @@
 ;;; emacsbug.el --- command to report Emacs bugs to appropriate mailing list
 
-;; Copyright (C) 1985, 1994, 1997-1998, 2000-2014 Free Software
-;; Foundation, Inc.
+;; Copyright (C) 1985, 1994, 1997-1998, 2000-2014
+;;   Free Software Foundation, Inc.
 
 ;; Author: K. Shane Hartman
 ;; Maintainer: emacs-devel@gnu.org
@@ -251,6 +251,8 @@ usually do not have translators for other languages.\n\n")))
       (insert "Configured using:\n `configure "
 	      system-configuration-options "'\n\n")
       (fill-region (line-beginning-position -1) (point)))
+    (insert "Configured features:\n" system-configuration-features "\n\n")
+    (fill-region (line-beginning-position -1) (point))
     (insert "Important settings:\n")
     (mapc
      (lambda (var)
diff --git a/src/ChangeLog b/src/ChangeLog
index 6ac67ca5592..1527c98f052 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2014-03-28  Glenn Morris  <rgm@gnu.org>
+
+	* emacs.c (syms_of_emacs) <system-configuration-features>: New var.
+
 2014-03-27  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Port recent signal-related changes to FreeBSD.
diff --git a/src/emacs.c b/src/emacs.c
index 9d070bda51b..07deccd16ec 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -2460,6 +2460,12 @@ Emacs is running.  */);
 	       doc: /* String containing the configuration options Emacs was built with.  */);
   Vsystem_configuration_options = build_string (EMACS_CONFIG_OPTIONS);
 
+  DEFVAR_LISP ("system-configuration-features", Vsystem_configuration_features,
+	       doc: /* String listing some of the main features this Emacs was compiled with.
+An element of the form \"FOO\" generally means that HAVE_FOO was
+defined during the build.  */);
+  Vsystem_configuration_features = build_string (EMACS_CONFIG_FEATURES);
+
   DEFVAR_BOOL ("noninteractive", noninteractive1,
 	       doc: /* Non-nil means Emacs is running without interactive terminal.  */);