Merge branch 'fix-openssl-linking'

* fix-openssl-linking:
  sample/https-client: use ERR_remove_*state() when we have them
  Do not check for ERR_remove_thread_state() (do not link ssl into every library)

Closes: #476
(cherry picked from commit 98faf19895bd6aa41c68f7da050179e207f05ae1)

CMakeLists.txt

@@ -879,10 +879,6 @@ if (NOT EVENT__DISABLE_SAMPLES)
         time-test)
 
     if (NOT EVENT__DISABLE_OPENSSL AND OPENSSL_LIBRARIES)
-        set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_LIBRARIES})
-        CHECK_FUNCTION_EXISTS_EX(ERR_remove_thread_state EVENT__HAVE_ERR_REMOVE_THREAD_STATE)
-        set(CMAKE_REQUIRED_LIBRARIES "")
-
         # Special sample with more than one file.
         add_executable(https-client
             sample/https-client.c

configure.ac

@@ -790,10 +790,6 @@ fi
 
 # check if we have and should use openssl
 AM_CONDITIONAL(OPENSSL, [test "$enable_openssl" != "no" && test "$have_openssl" = "yes"])
-if test "x$enable_openssl" = "xyes"; then
-	AC_SEARCH_LIBS([ERR_remove_thread_state], [crypto eay32],
-		[AC_DEFINE(HAVE_ERR_REMOVE_THREAD_STATE, 1, [Define to 1 if you have ERR_remove_thread_stat().])])
-fi
 
 # Add some more warnings which we use in development but not in the
 # released versions.  (Some relevant gcc versions can't handle these.)

event-config.h.cmake

@@ -526,9 +526,6 @@
 
 #cmakedefine EVENT__NEED_DLLIMPORT
 
-/* Define to 1 if you have ERR_remove_thread_stat(). */
-#cmakedefine EVENT__HAVE_ERR_REMOVE_THREAD_STATE
-
 /* Define if waitpid() supports WNOWAIT */
 #cmakedefine EVENT__HAVE_WAITPID_WITH_WNOWAIT
 

sample/https-client.c

@@ -492,11 +492,12 @@ cleanup:
 	EVP_cleanup();
 	ERR_free_strings();
 
-#ifdef EVENT__HAVE_ERR_REMOVE_THREAD_STATE
-	ERR_remove_thread_state(NULL);
-#else
+#if OPENSSL_VERSION_NUMBER < 0x10000000L
 	ERR_remove_state(0);
+#else
+	ERR_remove_thread_state(NULL);
 #endif
+
 	CRYPTO_cleanup_all_ex_data();
 
 	sk_SSL_COMP_free(SSL_COMP_get_compression_methods());