X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fgetdate.m4;h=67f9c6566da136f77dc1f5592a62271c75ff9114;hb=0a3f7af426469ab51370585e1a3afba66ff24b57;hp=5b2f77f2394afdfbb501b31a29d7832b031fd538;hpb=62a39c7d945eb4160c206242b85c624fb2fb21fd;p=gnulib.git

diff --git a/m4/getdate.m4 b/m4/getdate.m4
index 5b2f77f23..67f9c6566 100644
--- a/m4/getdate.m4
+++ b/m4/getdate.m4
@@ -1,22 +1,38 @@
-# getdate.m4 serial 7
-dnl Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+# getdate.m4 serial 14
+dnl Copyright (C) 2002-2006, 2008, 2009 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-AC_DEFUN([gl_GETDATE],
+dnl Define HAVE_COMPOUND_LITERALS if the C compiler supports compound literals
+dnl as in ISO C99.
+dnl Note that compound literals such as (struct s) { 3, 4 } can be used for
+dnl initialization of stack-allocated variables, but are not constant
+dnl expressions and therefore cannot be used as initializer for global or
+dnl static variables (even though gcc supports this in pre-C99 mode).
+AC_DEFUN([gl_C_COMPOUND_LITERALS],
 [
-  AC_LIBSOURCES([getdate.h, getdate.y])
-  AC_LIBOBJ([getdate])
+  AC_CACHE_CHECK([for compound literals], [gl_cv_compound_literals],
+  [AC_TRY_COMPILE([struct s { int i, j; };],
+    [struct s t = (struct s) { 3, 4 };
+     if (t.i != 0) return 0;],
+    gl_cv_compound_literals=yes,
+    gl_cv_compound_literals=no)])
+  if test $gl_cv_compound_literals = yes; then
+    AC_DEFINE([HAVE_COMPOUND_LITERALS], [1],
+      [Define if you have compound literals.])
+  fi
+])
 
+AC_DEFUN([gl_GETDATE],
+[
   dnl Prerequisites of lib/getdate.h.
   AC_REQUIRE([AM_STDBOOL_H])
   AC_REQUIRE([gl_TIMESPEC])
 
   dnl Prerequisites of lib/getdate.y.
   AC_REQUIRE([gl_BISON])
-  AC_REQUIRE([AC_HEADER_STDC])
-  AC_CHECK_FUNCS_ONCE(isascii)
+  AC_REQUIRE([gl_C_COMPOUND_LITERALS])
   AC_STRUCT_TIMEZONE
   AC_REQUIRE([gl_CLOCK_TIME])
   AC_REQUIRE([gl_TM_GMTOFF])