Autodetect support for IPv6 by default

Until now, IPv6 support was disabled by default, which seems a bit
outdated in 2024. Note: You still can pass "--enable-ipv6" or
"--disable-ipv6" to the ./configure script to forcefully activate or
deactivate IPv6 support.

diff --git a/ChangeLog b/ChangeLog
index 56d79e6d5c6f9e39a003249c4351cf73da6d8e2c..3d4ddcf2baaacd231858564c71b6cc246516692e 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -10,6 +10,10 @@
 
 ngIRCd 27
 
+  - Autodetect support for IPv6 by default: Until now, IPv6 support was disabled
+    by default, which seems a bit outdated in 2024. Note: You still can pass
+    "--enable-ipv6"/"--disable-ipv6" to the ./configure script to forcefully
+    activate or deactivate IPv6 support.
   - Update config.guess and config.sub to recent versions
   - Remove the unmaintained contrib/MacOSX/ folder: this includes the Xcode
     project as well as the outdated macOS "Package Maker" configuration. The

diff --git a/INSTALL.md b/INSTALL.md
index b5ad20edc6b473e7b1eacdcf436a2e72ffa2962f..28b1da337bbe5f13e2e5c008a0b7a65dfbf83b9f 100644 (file)
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -353,11 +353,12 @@ standard locations.
   Enable support for SSL/TLS using OpenSSL or GnuTLS libraries.
   See `doc/SSL.txt` for details.
 
-- IPv6:
+- IPv6 (autodetected by default):
 
-  `--enable-ipv6`
+  `--enable-ipv6` / `--disable-ipv6`
 
-  Adds support for version 6 of the Internet Protocol.
+  Enable (disable) support for version 6 of the Internet Protocol, which should
+  be available on most modern UNIX-like operating systems by default.
 
 ## Configuration
 

diff --git a/configure.ng b/configure.ng
index ff376a5050ad22f77fc6681e1dd6c4d8d8fe6263..195e4067beda5d12e6b0e58032c6848313ee548e 100644 (file)
--- a/configure.ng
+++ b/configure.ng
@@ -1,6 +1,6 @@
 #
 # ngIRCd -- The Next Generation IRC Daemon
-# Copyright (c)2001-2014 Alexander Barton (alex@barton.de) and Contributors
+# Copyright (c)2001-2024 Alexander Barton (alex@barton.de) and Contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -639,18 +639,24 @@ if test "$x_ircplus_on" = "yes"; then
 fi
 
 # enable support for IPv6?
-x_ipv6_on=no
+
+x_ipv6_on=yes
 AC_ARG_ENABLE(ipv6,
-       AS_HELP_STRING([--enable-ipv6],
-                      [enable IPv6 protocol support]),
-       if test "$enableval" = "yes"; then x_ipv6_on=yes; fi
+       AS_HELP_STRING([--disable-ipv6],
+                      [disable IPv6 protocol support (autodetected by default)]),
+       [       if test "$enableval" = "no"; then
+                       x_ipv6_on=no
+               else
+                       AC_CHECK_FUNCS(
+                               [getaddrinfo getnameinfo],,
+                               AC_MSG_ERROR([required function missing for IPv6 support!])
+                       )
+               fi
+       ],
+       [       AC_CHECK_FUNCS([getaddrinfo getnameinfo],, x_ipv6_on=no)
+       ]
 )
 if test "$x_ipv6_on" = "yes"; then
-       # getaddrinfo() and getnameinfo() are optional when not compiling
-       # with IPv6 support, but are required for IPv6 to work!
-       AC_CHECK_FUNCS([ \
-               getaddrinfo getnameinfo \
-               ],,AC_MSG_ERROR([required function missing for IPv6 support!]))
        AC_DEFINE(WANT_IPV6, 1)
 fi