Fix build for systems that don't provide POSIX.1-2001 by default

[empserver] / configure.ac

diff --git a/configure.ac b/configure.ac
index cb6b09e39166f862a20d06535d1529d31201e666..b37129a58fec6e469f6427acc21b3963db54f57c 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 #
 #   Empire - A multi-player, client/server Internet based war game.
-#   Copyright (C) 1986-2017, Dave Pare, Jeff Bailey, Thomas Ruschak,
+#   Copyright (C) 1986-2020, Dave Pare, Jeff Bailey, Thomas Ruschak,
 #                 Ken Stevens, Steve McClure, Markus Armbruster
 #
 #   Empire is free software: you can redistribute it and/or modify
@@ -27,7 +27,7 @@
 #   configure.ac: Autoconf input file
 #
 #   Known contributors to this file:
-#      Markus Armbruster, 2005-2016
+#      Markus Armbruster, 2005-2020
 #
 # Process this file with autoconf to produce a configure script.
 
@@ -46,15 +46,19 @@ AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_HEADERS([config.h])
 
-
 ### Checks for programs
 AC_PROG_AWK
 AC_PROG_INSTALL
 AC_PROG_RANLIB
-AC_PROG_CC
+
+AC_PROG_CC_STDC
 AM_PROG_CC_C_O
 # Private automake macro, tsk, tsk, tsk...
 _AM_DEPENDENCIES(CC)
+AC_DEFINE([_XOPEN_SOURCE], [600],
+         [Request POSIX-1.2001 with XSI Extension])
+# Note: this is after AC_PROG_CC_STDC, because Solaris cc fails with
+# _XOPEN_SOURCE unless switched to C99, which breaks AC_PROG_CC_STDC.
 
 AC_ARG_VAR(NROFF, [nroff command])
 AC_CHECK_PROG(NROFF, groff, [GROFF_NO_SGR= groff -Tascii -U], nroff)
@@ -64,8 +68,8 @@ if test -d $srcdir/.git
 then revctrl=git
 else revctrl=
 fi
-if test "$revctrl" && test -r .tarball-version
-then AC_MSG_ERROR([.tarball-version must not exist])
+if test "$revctrl" && test -r $srcdir/.tarball-version
+then AC_MSG_ERROR([$srcdir/.tarball-version must not exist])
 fi
 AC_SUBST(revctrl,$revctrl)
 
@@ -167,7 +171,8 @@ main(int argc, char *argv[])
 
 ### Checks for library functions
 
-AC_CHECK_FUNCS(getaddrinfo getpass)
+AC_CHECK_FUNCS(getaddrinfo)
+MY_WORKING_IN6_IS_ADDR_V4MAPPED
 MY_FUNC_MAKECONTEXT