build: Remove check for IPv6

Only check for availability of netdb.h.

config.h.cmake.in

@@ -93,9 +93,6 @@
 /* Define to 1 if you have the <zlib.h> header file. */
 #cmakedefine HAVE_ZLIB_H 1
 
-/* Support for IPv6 */
-#cmakedefine SUPPORT_IP6 1
-
 /* Version number of package */
 #cmakedefine VERSION "@VERSION@"
 

configure.ac

@@ -327,36 +327,6 @@ if test "$with_http" = "yes"; then
             LIBS=$_libs
             ;;
     esac
-
-    dnl
-    dnl Checking for availability of IPv6
-    dnl
-    AC_ARG_ENABLE(ipv6, [  --enable-ipv6[[=yes/no]]  enables compilation of IPv6 code [[default=yes]]],, enable_ipv6=yes)
-    if test "$with_minimum" = "yes"
-    then
-        enable_ipv6=no
-    fi
-    if test $enable_ipv6 = yes; then
-        AC_MSG_CHECKING([whether to enable IPv6])
-        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-            #ifdef _WIN32
-              #include <winsock2.h>
-            #else
-              #include <sys/socket.h>
-              #ifdef HAVE_NETDB_H
-                #include <netdb.h>
-              #endif
-            #endif
-            ]], [[
-            struct sockaddr_storage ss;
-            socket(AF_INET6, SOCK_STREAM, 0);
-            getaddrinfo(0, 0, 0, 0);
-            ]])], [
-            AC_DEFINE([SUPPORT_IP6], [], [Support for IPv6])
-            AC_MSG_RESULT([yes])], [
-            AC_MSG_RESULT([no])]
-        )
-    fi
 fi
 
 dnl

meson.build

@@ -76,9 +76,6 @@ want_html = want_minimum ? feature.enabled() : feature.allowed()
 feature = get_option('iconv')
 want_iconv = want_minimum ? feature.enabled() : feature.allowed()
 
-feature = get_option('ipv6')
-want_ipv6 = want_minimum ? feature.enabled() : feature.allowed()
-
 feature = get_option('iso8859x')
 want_iso8859x = want_minimum ? feature.enabled() : feature.allowed()
 
@@ -381,16 +378,6 @@ if want_http == true
             endif
         endif
     endif
-
-    if sys_windows
-        netheader = 'winsock2.h'
-    else
-        netheader = 'sys/socket.h'
-    endif
-
-    if want_ipv6 == true
-        config_h.set('SUPPORT_IP6', cc.has_header_symbol(netheader, 'AF_INET6', required: get_option('ipv6')))
-    endif
 endif
 
 ### zlib
@@ -611,7 +598,6 @@ summary(
         'http': want_http,
         'iconv': want_iconv,
         'icu': want_icu,
-        'ipv6': want_ipv6,
         'iso8859x': want_iso8859x,
         'legacy': want_legacy,
         'lzma': want_lzma,

meson_options.txt

@@ -8,7 +8,6 @@
 # [X] http
 # [X] iconv
 # [X] icu         - not minimum
-# [X] ipv6
 # [X] iso8859x
 # [X] legacy
 # [X] lzma
@@ -34,7 +33,6 @@
 # [X] zlib
 
 # [X] minimum
-# [X] ipv6
 
 option('c14n',
   type: 'feature',
@@ -77,11 +75,6 @@ option('icu',
   description: 'ICU support'
 )
 
-option('ipv6',
-  type: 'feature',
-  description: 'Compilation of IPv6 code'
-)
-
 option('iso8859x',
   type: 'feature',
   description: 'ISO-8859-X support if no iconv'

nanohttp.c

@@ -36,6 +36,9 @@
 #endif
 #ifdef HAVE_NETDB_H
 #include <netdb.h>
+#ifndef SUPPORT_IP6
+  #define SUPPORT_IP6
+#endif
 #endif
 #ifdef HAVE_FCNTL_H
 #include <fcntl.h>