[SCM] GNU Autoconf source repository branch, master, updated. v2.69-56-gca8b864

[Paul Eggert]

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- Log -----------------------------------------------------------------
commit ca8b864f431faeae3caeac671e339c75c775e5a6
Author: Paul Eggert <***@cs.ucla.edu>
Date: Thu Dec 27 14:34:07 2012 -0800

AC_C__GENERIC: New macro.

* NEWS, doc/autoconf.texi (C Compiler): Document it.
* lib/autoconf/c.m4 (AC_C__GENERIC): Implement it.

-----------------------------------------------------------------------

Summary of changes:
NEWS | 2 ++
doc/autoconf.texi | 7 +++++++
lib/autoconf/c.m4 | 27 +++++++++++++++++++++++++++
3 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/NEWS b/NEWS
index 185ca26..a4cd3a1 100644
--- a/NEWS
+++ b/NEWS
@@ -10,6 +10,8 @@ GNU Autoconf NEWS - User visible changes.

** Macros

+- New macro AC_C__GENERIC.
+
- AC_CONFIG_MACRO_DIRS
New macro, used to declare multiple directories when looking for
local M4 macros. This macro overcomes some of the shortfalls in the
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index aa948a9..bcf8f86 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -7434,6 +7434,13 @@ This macro is obsolescent, as current C compilers support @code{const}.
New programs need not use this macro.
@end defmac

+@defmac AC_C__GENERIC
+@acindex{C__GENERIC}
+@cvindex _Generic
+If the C compiler supports C11-style generic selection using the
+@code{_Generic} keyword, define @code{HAVE_C__GENERIC}.
+@end defmac
+
@defmac AC_C_RESTRICT
@acindex{C_RESTRICT}
@cvindex restrict
diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
index e17df1e..edc663b 100644
--- a/lib/autoconf/c.m4
+++ b/lib/autoconf/c.m4
@@ -1690,6 +1690,33 @@ dnl default behavior for universal builds.
])# AC_C_BIGENDIAN


+# AC_C__GENERIC
+# -------------
+# Define HAVE_C__GENERIC if _Generic works, a la C11.
+AN_IDENTIFIER([_Generic], [AC_C__GENERIC])
+AC_DEFUN([AC_C__GENERIC],
+[AC_CACHE_CHECK([for _Generic], ac_cv_c__Generic,
+[AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[int
+ main (int argc, char **argv)
+ {
+ int a = _Generic (argc, int: argc = 1);
+ int *b = &_Generic (argc, default: argc);
+ char ***c = _Generic (argv, int: argc, default: argv ? &argv : 0);
+ _Generic (1 ? 0 : b, int: a, default: b) = &argc;
+ _Generic (a = 1, default: a) = 3;
+ return a + !b + !c;
+ }
+ ]])],
+ [ac_cv_c__Generic=yes],
+ [ac_cv_c__Generic=no])])
+if test $ac_cv_c__Generic = yes; then
+ AC_DEFINE([HAVE_C__GENERIC], 1,
+ [Define to 1 if C11-style _Generic works.])
+fi
+])# AC_C__GENERIC
+
# AC_C_INLINE
# -----------
# Do nothing if the compiler accepts the inline keyword.


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