Revert "Merge branch 'develop' into feature/userhostnames"

This reverts commit 6ae7c38, reversing
changes made to df4d2bf.

aclocal.m4

@@ -192,12 +192,12 @@ dnl Check for a working C99 C compiler.
 dnl
 AC_DEFUN([EGG_CHECK_CC_C99],
 [
-  if test "$ac_cv_prog_cc_c11" = no && test "$ac_cv_prog_cc_c99" = no; then
+  if test "$ac_cv_prog_cc_c99" = no; then
     cat << 'EOF' >&2
 configure: error:
 
-  This C compiler does not appear to have a working C99/C11 mode.
-  A working C99/C11 C compiler is required to compile Eggdrop.
+  This C compiler does not appear to have a working C99 mode.
+  A working C99 C compiler is required to compile Eggdrop.
 
 EOF
     exit 1
@@ -313,37 +313,49 @@ AC_DEFUN([EGG_FUNC_B64_NTOP],
 
   # Check for b64_ntop. If we have b64_ntop, we assume b64_pton as well.
   AC_MSG_CHECKING(for b64_ntop)
-  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+  AC_TRY_LINK(
+    [
       #include <sys/types.h>
       #include <netinet/in.h>
       #include <resolv.h>
-    ]], [[b64_ntop(NULL, 0, NULL, 0);]])],[found_b64_ntop=yes],[found_b64_ntop=no
-  ])
+    ],
+    [b64_ntop(NULL, 0, NULL, 0);],
+    found_b64_ntop=yes,
+    found_b64_ntop=no
+  )
   if test "x$found_b64_ntop" = xno; then
     AC_MSG_RESULT(no)
 
     AC_MSG_CHECKING(for b64_ntop with -lresolv)
     OLD_LIBS="$LIBS"
     LIBS="$LIBS -lresolv"
-    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+    AC_TRY_LINK(
+      [
         #include <sys/types.h>
         #include <netinet/in.h>
         #include <resolv.h>
-      ]], [[b64_ntop(NULL, 0, NULL, 0);]])],[found_b64_ntop=yes],[found_b64_ntop=no
-    ])
+      ],
+      [b64_ntop(NULL, 0, NULL, 0);],
+      found_b64_ntop=yes,
+      found_b64_ntop=no
+    )
     if test "x$found_b64_ntop" = xno; then
       LIBS="$OLD_LIBS"
       AC_MSG_RESULT(no)
 
       AC_MSG_CHECKING(for b64_ntop with -lnetwork)
       OLD_LIBS="$LIBS"
       LIBS="-lnetwork"
-      AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+      AC_TRY_LINK(
+      [
         #include <sys/types.h>
         #include <netinet/in.h>
         #include <resolv.h>
-        ]], [[b64_ntop(NULL, 0, NULL, 0);]])],[found_b64_ntop=yes],[found_b64_ntop=no
-      ])
+        ],
+        [b64_ntop(NULL, 0, NULL, 0);],
+        found_b64_ntop=yes,
+        found_b64_ntop=no
+      )
       if test "x$found_b64_ntop" = xno; then
         LIBS="$OLD_LIBS"
         AC_MSG_RESULT(no)
@@ -1417,20 +1429,22 @@ if test "$enable_ipv6" = "yes"; then
   if test "$egg_cv_var_have_in6_addr" = "yes"; then
     # Check for in6addr_any
     AC_CACHE_CHECK([for the in6addr_any constant], [egg_cv_var_have_in6addr_any], [
-      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+      AC_TRY_COMPILE([
         #include <sys/types.h>
         #include <netinet/in.h>
-      ]], [[struct in6_addr i6 = in6addr_any;]])],[egg_cv_var_have_in6addr_any="yes"],[egg_cv_var_have_in6addr_any="no"])
+      ], [struct in6_addr i6 = in6addr_any;],
+      [egg_cv_var_have_in6addr_any="yes"], [egg_cv_var_have_in6addr_any="no"])
     ])
     if test "$egg_cv_var_have_in6addr_any" = "yes"; then
       AC_DEFINE(HAVE_IN6ADDR_ANY, 1, [Define to 1 if you have the in6addr_any constant.])
     fi
     # Check for in6addr_loopback
     AC_CACHE_CHECK([for the in6addr_loopback constant], [egg_cv_var_have_in6addr_loopback], [
-      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+      AC_TRY_COMPILE([
         #include <sys/types.h>
         #include <netinet/in.h>
-      ]], [[struct in6_addr i6 = in6addr_loopback;]])],[egg_cv_var_have_in6addr_loopback="yes"],[egg_cv_var_have_in6addr_loopback="no"])
+      ], [struct in6_addr i6 = in6addr_loopback;],
+      [egg_cv_var_have_in6addr_loopback="yes"], [egg_cv_var_have_in6addr_loopback="no"])
     ])
     if test "$egg_cv_var_have_in6addr_loopback" = "yes"; then
       AC_DEFINE(HAVE_IN6ADDR_LOOPBACK, 1, [Define to 1 if you have the in6addr_loopback constant.])
@@ -1516,10 +1530,13 @@ AC_DEFUN([EGG_TLS_ENABLE],
 [
   AC_MSG_CHECKING([whether to enable TLS support])
   AC_ARG_ENABLE(tls,
-    [  --disable-tls           disable TLS support ], [tls_enabled="$enableval"],
-    [tls_enabled="$enableval"])
+    [  --enable-tls            enable TLS support (autodetect)],
+    [enable_tls="$enableval"])
+  AC_ARG_ENABLE(tls,
+    [  --disable-tls           disable TLS support ], [enable_tls="$enableval"],
+    [enable_tls="autodetect"])
 
-  AC_MSG_RESULT([$tls_enabled])
+  AC_MSG_RESULT([$enable_tls])
 ])
 
 
@@ -1529,14 +1546,14 @@ AC_DEFUN(EGG_TLS_WITHSSL,
 [
   save_LIBS="$LIBS"
   AC_ARG_WITH(sslinc, [  --with-sslinc=PATH      Path to OpenSSL headers], [
-    if test "$tls_enabled" != "no"; then
+    if test "$enable_tls" != "no"; then
       if test -d "$withval"; then
         save_CC="$CC"
         save_CPP="$CPP"
         CC="$CC -I$withval"
         CPP="$CPP -I$withval"
         AC_CHECK_HEADERS([openssl/ssl.h openssl/x509v3.h], [sslinc="-I$withval"], [
-          AC_MSG_ERROR([Invalid path to OpenSSL headers. $withval/openssl/ doesn't contain the required files.])
+          AC_MSG_WARN([Invalid path to OpenSSL headers. $withval/openssl/ doesn't contain the required files.])
           sslinc=""
           break
         ], [[
@@ -1550,25 +1567,25 @@ AC_DEFUN(EGG_TLS_WITHSSL,
         CC="$save_CC"
         CPP="$save_CPP"
       else
-        AC_MSG_ERROR([Invalid path to OpenSSL headers. $withval is not a directory.])
+        AC_MSG_WARN([Invalid path to OpenSSL headers. $withval is not a directory.])
       fi
     fi
   ])
 
   AC_ARG_WITH(ssllib, [  --with-ssllib=PATH      Path to OpenSSL libraries],
   [
-    if test "$tls_enabled" != "no"; then
+    if test "$enable_tls" != "no"; then
       if test -d "$withval"; then
         AC_CHECK_LIB(crypto, X509_digest, , [havessllib="no"], [-L$withval -lssl])
         AC_CHECK_LIB(ssl, SSL_accept, , [havessllib="no"], [-L$withval -lcrypto])
         if test "$havessllib" = "no"; then
-          AC_MSG_ERROR([Invalid path to OpenSSL libs. $withval doesn't contain the required files.])
+          AC_MSG_WARN([Invalid path to OpenSSL libs. $withval doesn't contain the required files.])
         else
           AC_SUBST(SSL_LIBS, [-L$withval])
           LDFLAGS="${LDFLAGS} -L$withval"
         fi
       else
-        AC_MSG_ERROR([You have specified an invalid path to OpenSSL libs. $withval is not a directory.])
+        AC_MSG_WARN([You have specified an invalid path to OpenSSL libs. $withval is not a directory.])
       fi
     fi
   ])
@@ -1579,7 +1596,8 @@ dnl EGG_TLS_DETECT
 dnl
 AC_DEFUN([EGG_TLS_DETECT],
 [
-  if test "$tls_enabled" != "no"; then
+  tls_enabled="no"
+  if test "$enable_tls" != "no"; then
     if test -z "$SSL_INCLUDES"; then
       AC_CHECK_HEADERS([openssl/ssl.h openssl/x509v3.h], , [havesslinc="no"], [
         #ifdef CYGWIN_HACKS
@@ -1592,12 +1610,11 @@ AC_DEFUN([EGG_TLS_DETECT],
     if test -z "$SSL_LIBS"; then
       AC_CHECK_LIB(crypto, X509_digest, , [havessllib="no"], [-lssl])
       AC_CHECK_LIB(ssl, SSL_accept, , [havessllib="no"], [-lcrypto])
-      AC_CHECK_FUNCS([EVP_sha1 a2i_IPADDRESS], , [[
+      AC_CHECK_FUNCS([EVP_md5 EVP_sha1 a2i_IPADDRESS], , [[
         havessllib="no"
         break
       ]])
     fi
-    AC_CHECK_FUNCS([EVP_md5])
     AC_CHECK_FUNC(OPENSSL_buf2hexstr, ,
       AC_CHECK_FUNC(hex_to_string,
           AC_DEFINE([OPENSSL_buf2hexstr], [hex_to_string], [Define this to hex_to_string when using OpenSSL < 1.1.0])
@@ -1614,20 +1631,20 @@ AC_DEFUN([EGG_TLS_DETECT],
           break
       ]])
     )
-    if test "$havesslinc" = "no"; then
-      AC_MSG_WARN([Cannot find OpenSSL headers.])
-      AC_MSG_WARN([Please specify the path to the openssl include dir using --with-sslinc=path])
-    fi
-    if test "$havessllib" = "no"; then
-      AC_MSG_WARN([Cannot find OpenSSL libraries.])
-      AC_MSG_WARN([Please specify the path to libssl and libcrypto using --with-ssllib=path])
+    if test "$enable_tls" = "yes"; then
+      if test "$havesslinc" = "no"; then
+        AC_MSG_WARN([Cannot find OpenSSL headers.])
+        AC_MSG_WARN([Please specify the path to the openssl include dir using --with-sslinc=path])
+      fi
+      if test "$havessllib" = "no"; then
+        AC_MSG_WARN([Cannot find OpenSSL libraries.])
+        AC_MSG_WARN([Please specify the path to libssl and libcrypto using --with-ssllib=path])
+      fi
     fi
     AC_MSG_CHECKING([for OpenSSL])
     if test "$havesslinc" = "no" || test "$havessllib" = "no"; then
-      AC_MSG_RESULT([no])
-      AC_MSG_RESULT([* We tried, but couldn't find TLS libraries. If installed, please specify their paths using the configure flags above])
-      AC_MSG_RESULT([* While not recommended, you can continue without TLS protection by specifying the --disable-tls configure flag])
-      AC_MSG_ERROR([TLS Libraries not found])
+      AC_MSG_RESULT([no (make sure you have version 0.9.8 or higher installed)])
+      LIBS="$save_LIBS"
     else
       AC_MSG_RESULT([yes])
       if test "$EGG_CYGWIN" = "yes"; then
@@ -1642,6 +1659,7 @@ AC_DEFUN([EGG_TLS_DETECT],
       )
       dnl EVP_PKEY_get1_EC_KEY: OpenSSL without EC (SunOS 5.11 Solaris 11.3 I love you Oracle)
       AC_CHECK_FUNCS([EVP_PKEY_get1_EC_KEY])
+      tls_enabled="yes"
       EGG_MD5_COMPAT
     fi
   fi