Assume C99 or later.

* lib/stdarg.in.h, lib/stdbool.in.h, m4/stdarg.m4, m4/stdbool.m4:
Remove.
* configure.ac (_AC_PROG_CC_C89): Define a dummy, to keep 'configure'
smaller.
(gl_PROG_CC_C99): Use this to get C99 or later.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* admin/merge-gnulib (GNULIB_MODULES): Remove stdarg, stdbool.
(GNULIB_TOOL_FLAGS): Avoid stdarg, stdbool.
* doc/lispref/internals.texi (C Dialect): Document this.
* etc/NEWS: Document this.
* nt/gnulib.mk: Remove stdarg and stdbool modules.
* src/bytecode.c (B__dummy__): Remove.
* src/conf_post.h (bool_bf) [!NS_IMPL_GNUSTEP]: Use bool.
(FLEXIBLE_ARRAY_MEMBER): Now always empty.
* src/dbusbind.c (XD_DEBUG_MESSAGE) [!DBUS_DEBUG]:
* src/regex.c (DEBUG_PRINT): Assume varargs macros.
* src/lisp.h (DEFUN_FUNCTION_INIT): Remove.  All uses now assume C99.

Fixes: debbugs:17487

2 files changed, 11 insertions, 7 deletions

diff --git a/doc/lispref/ChangeLog b/doc/lispref/ChangeLog
index 7d85e4059c9..d892e1307a0 100644
--- a/doc/lispref/ChangeLog
+++ b/doc/lispref/ChangeLog
@@ -1,3 +1,8 @@
+2014-05-17  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Assume C99 or later (Bug#17487).
+        * internals.texi (C Dialect): Document this.
+
 2014-05-15  Dmitry Antipov  <dmantipov@yandex.ru>
 
         * lists.texi (Building Cons Cells and Lists): Remove
diff --git a/doc/lispref/internals.texi b/doc/lispref/internals.texi
index bfc9d491c5e..3a5bd4aea7e 100644
--- a/doc/lispref/internals.texi
+++ b/doc/lispref/internals.texi
@@ -580,15 +580,14 @@ Emacs session.
 @section C Dialect
 @cindex C programming language
 
-The C part of Emacs is portable to C89: C99-specific features such as
-@samp{<stdbool.h>} and @samp{inline} are not used without a check,
+The C part of Emacs is portable to C99 or later: C11-specific features such
+as @samp{<stdalign.h>} and @samp{_Noreturn} are not used without a check,
 typically at configuration time, and the Emacs build procedure
-provides a substitute implementation if necessary.  Some C99 features,
-such as declarations after statements, are too difficult to provide
-substitutes for, so they are avoided entirely.
+provides a substitute implementation if necessary.  Some C11 features,
+such as anonymous structures and unions, are too difficult to emulate,
+so they are avoided entirely.
 
-At some point in the not-too-distant future the base C dialect will
-change from C89 to C99, and eventually it will no doubt change to C11.
+At some point in the future the base C dialect will no doubt change to C11.
 
 @node Writing Emacs Primitives
 @section Writing Emacs Primitives