build: Update for newer autoconf.

* configure.ac (AC_PREREQ): Use >= 2.69.
(AC_CONFIG_HEADERS): Use it, instead of AC_CONFIG_HEADER.
(AC_HEADER_STDC, AC_HEADER_TIME): Remove obsolete macros.
(sys/time.h): Add the check of the header.
(time_t): Don't use TIME_WITH_SYS_TIME.
* acinclude.m4 (AC_HEADER_TIME): Don't require.
Don't use TIME_WITH_SYS_TIME.
* dirmngr/dns.c: Don't use TIME_WITH_SYS_TIME.

--

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>

acinclude.m4

@@ -164,18 +164,12 @@ AC_DEFUN([GNUPG_GPG_DISABLE_ALGO],
 #
 AC_DEFUN([GNUPG_TIME_T_UNSIGNED],
   [ AC_CACHE_CHECK(whether time_t is unsigned, gnupg_cv_time_t_unsigned,
-     [AC_REQUIRE([AC_HEADER_TIME])dnl
-      AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY(
+     [AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY(
        [AC_INCLUDES_DEFAULT([])
-#if TIME_WITH_SYS_TIME
+#if HAVE_SYS_TIME_H
 # include <sys/time.h>
-# include <time.h>
 #else
-# if HAVE_SYS_TIME_H
-#  include <sys/time.h>
-# else
-#  include <time.h>
-# endif
+# include <time.h>
 #endif
 ],
        [((time_t)-1) < 0])],

configure.ac

@@ -19,7 +19,7 @@
 # along with this program; if not, see <https://www.gnu.org/licenses/>.
 
 # Process this file with autoconf to produce a configure script.
-AC_PREREQ([2.61])
+AC_PREREQ([2.69])
 min_automake_version="1.16.3"
 
 # To build a release you need to create a tag with the version number
@@ -83,7 +83,7 @@ VERSION=$PACKAGE_VERSION
 
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_SRCDIR([sm/gpgsm.c])
-AC_CONFIG_HEADER([config.h])
+AC_CONFIG_HEADERS([config.h])
 AM_INIT_AUTOMAKE([serial-tests dist-bzip2 no-dist-gzip])
 AC_CANONICAL_HOST
 AB_INIT
@@ -1360,10 +1360,8 @@ fi
 # Checks for header files.
 #
 AC_MSG_NOTICE([checking for header files])
-AC_HEADER_STDC
-AC_HEADER_TIME
 AC_CHECK_HEADERS([unistd.h langinfo.h termio.h locale.h \
-                  pwd.h inttypes.h signal.h sys/select.h     \
+                  pwd.h inttypes.h signal.h sys/select.h sys/time.h \
                   stdint.h signal.h termios.h \
                   ucred.h sys/ucred.h sys/sysmacros.h sys/mkdev.h])
 
@@ -1408,15 +1406,10 @@ AC_CHECK_SIZEOF(unsigned long long)
 AC_CHECK_SIZEOF(size_t)
 AC_CHECK_SIZEOF(time_t,,[[
 #include <stdio.h>
-#if TIME_WITH_SYS_TIME
+#ifdef HAVE_SYS_TIME_H
 # include <sys/time.h>
-# include <time.h>
 #else
-# if HAVE_SYS_TIME_H
-#  include <sys/time.h>
-# else
-#  include <time.h>
-# endif
+# include <time.h>
 #endif
 ]])
 GNUPG_TIME_T_UNSIGNED

dirmngr/dns.c

@@ -56,7 +56,7 @@
 #include <ws2tcpip.h>
 typedef SOCKET socket_fd_t;
 #define STDCALL __stdcall
-#ifdef TIME_WITH_SYS_TIME
+#ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>		/* gettimeofday(2) */
 #endif
 #else