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.

2 files changed, 10 insertions, 0 deletions

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.  */);