From d8fbeee466e6ce08d950fd694d5e58065d2fee97 Mon Sep 17 00:00:00 2001
From: Rodrigo Arias Mallo <rodarima@gmail.com>
Date: Fri, 11 Jul 2025 21:38:49 +0200
Subject: Detect IPv6 support by default

To avoid the autodetection and force it to be enabled or disabled use
--enable-ipv6 or --disable-ipv6 respectively.

Fixes: https://github.com/dillo-browser/dillo/issues/167
---
 ChangeLog    |  1 +
 configure.ac | 29 +++++++++++++++++++++++++++--
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 51422c09..aa5a07cd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -12,6 +12,7 @@ dillo-3.3.0 [Unreleased]
  - Add about:keys to display current keyboard shortcuts.
  - Control + left click opens links in new tab (emulates mouse middle button).
  - Ctrl+C copies selected text into the clipboard so Ctrl+V works as expected.
+ - Enable IPv6 support by default if supported by the platform.
    Patches: Rodrigo Arias Mallo
 +- Middle click on back or forward button opens page in new tab.
    Patches: Alex
diff --git a/configure.ac b/configure.ac
index 74cb1141..4d1d763c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,9 +45,9 @@ AC_ARG_ENABLE([insure],
   [enable_insure=no])
 
 AC_ARG_ENABLE([ipv6],
-  [AS_HELP_STRING([--enable-ipv6], [Build with support for IPv6])],
+  [AS_HELP_STRING([--enable-ipv6], [Build with support for IPv6 (default: auto)])],
   [enable_ipv6=$enableval],
-  [enable_ipv6=no])
+  [enable_ipv6=auto])
 
 AC_ARG_ENABLE([cookies],
   [AS_HELP_STRING([--disable-cookies], [Dont compile support for cookies])],
@@ -669,6 +669,30 @@ pthread_ok=yes, pthread_ok=no)
 esac
 fi
 
+dnl ------------
+dnl IPv6 support
+dnl ------------
+dnl
+html_tests_ok=no
+if test "x$enable_ipv6" = "xauto" ; then
+  dnl Detect support for IPv6 in libc
+  AC_MSG_CHECKING([for IPv6 support])
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#include <sys/socket.h>
+#include <netinet/in.h>
+]],[[
+struct sockaddr_in6 sa;
+size_t len = sizeof(struct sockaddr_in6);
+sa.sin6_family = AF_INET6;
+int fd;
+connect(fd, (struct sockaddr *)&sa, len);
+]])],
+  enable_ipv6=yes,
+  enable_ipv6=no)
+
+  AC_MSG_RESULT([$enable_ipv6])
+fi
+
 dnl ----------
 dnl HTML tests
 dnl ----------
@@ -856,6 +880,7 @@ _AS_ECHO([  GIF enabled    : ${enable_gif}])
 _AS_ECHO([  SVG enabled    : ${enable_svg}])
 _AS_ECHO([  WEBP enabled   : ${webp_ok}])
 _AS_ECHO([  Brotli enabled : ${brotli_ok}])
+_AS_ECHO([  IPv6 enabled   : ${enable_ipv6}])
 _AS_ECHO([])
 _AS_ECHO([  HTML tests     : ${html_tests_ok}])
 _AS_ECHO([])
-- 
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