From 2f1b5347c98fdd85b5312dd0e845ddc688a2ae55 Mon Sep 17 00:00:00 2001
From: psychon <psychon@726aef4b-f618-498e-8847-2d620e286838>
Date: Fri, 16 May 2008 15:01:41 +0000
Subject: [PATCH] configure: Fix dlopen() detection

The 'appendLib -ldl' is the important part, autoconf doesn't do that
automatically if you give it an argument.

This bug only triggered with --disable-debug (libssl pulled in libdl).


git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@1057 726aef4b-f618-498e-8847-2d620e286838
---
 configure    | 10 +++++++++-
 configure.in | 10 +++++++++-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index ac8f789a..dcb54804 100755
--- a/configure
+++ b/configure
@@ -3564,6 +3564,12 @@ fi
 
 if test "$MODULES" = "yes"; then
 	FOUND_DL=no
+
+	# Don't use any libs like -lssl -lcrypto when checking for dlopen(),
+	# because they might change the test results
+	SAVED_LIBS="$LIBS"
+	LIBS=""
+
 	{ echo "$as_me:$LINENO: checking for dlopen" >&5
 echo $ECHO_N "checking for dlopen... $ECHO_C" >&6; }
 if test "${ac_cv_func_dlopen+set}" = set; then
@@ -3711,10 +3717,12 @@ fi
 { echo "$as_me:$LINENO: result: $ac_cv_lib_dl_dlopen" >&5
 echo "${ECHO_T}$ac_cv_lib_dl_dlopen" >&6; }
 if test $ac_cv_lib_dl_dlopen = yes; then
-  FOUND_DL=yes
+  FOUND_DL=yes ; appendLib -ldl
 fi
 
 
+	appendLib "$SAVED_LIBS"
+
 	if test $FOUND_DL = "no" ; then
 		{ { echo "$as_me:$LINENO: error: Could not find dlopen. Try --disable-modules" >&5
 echo "$as_me: error: Could not find dlopen. Try --disable-modules" >&2;}
diff --git a/configure.in b/configure.in
index a75c5ba2..857145ef 100644
--- a/configure.in
+++ b/configure.in
@@ -137,8 +137,16 @@ AC_ARG_WITH( [module-data-prefix],
 
 if test "$MODULES" = "yes"; then
 	FOUND_DL=no
+
+	# Don't use any libs like -lssl -lcrypto when checking for dlopen(),
+	# because they might change the test results
+	SAVED_LIBS="$LIBS"
+	LIBS=""
+
 	AC_CHECK_FUNC(dlopen, FOUND_DL=yes,)
-	AC_CHECK_LIB( dl, dlopen, FOUND_DL=yes,)
+	AC_CHECK_LIB( dl, dlopen, FOUND_DL=yes ; appendLib -ldl,)
+
+	appendLib "$SAVED_LIBS"
 
 	if test $FOUND_DL = "no" ; then
 		AC_ERROR([Could not find dlopen. Try --disable-modules])