MDEV-9557 - fix compilation errors due to missing krb5_free_unparsed_name() in...

MDEV-9557 - fix compilation errors due to missing krb5_free_unparsed_name() in old versions of Heimdal Kerberos

plugin/auth_gssapi/CMakeLists.txt

@@ -17,6 +17,15 @@ ELSE()
    SET(GSSAPI_CLIENT gssapi_client.cc)
    SET(GSSAPI_SERVER gssapi_server.cc)
    SET(GSSAPI_ERRMSG gssapi_errmsg.cc)
+
+   SET(CMAKE_REQUIRED_INCLUDES ${GSSAPI_INCS})
+   SET(CMAKE_REQUIRED_LIBRARIES ${GSSAPI_LIBS})
+   INCLUDE(CheckCXXSymbolExists)
+   CHECK_CXX_SYMBOL_EXISTS(krb5_free_unparsed_name "krb5.h" HAVE_KRB5_FREE_UNPARSED_NAME)
+   IF(HAVE_KRB5_FREE_UNPARSED_NAME)
+     ADD_DEFINITIONS(-DHAVE_KRB5_FREE_UNPARSED_NAME=1)
+   ENDIF()
+
  ELSE()
    # Can't build plugin
    RETURN()

plugin/auth_gssapi/cmake/FindGSSAPI.cmake

@@ -39,7 +39,7 @@ if(GSSAPI_LIBS AND GSSAPI_FLAVOR)
 
 else(GSSAPI_LIBS AND GSSAPI_FLAVOR)
 
-  find_program(KRB5_CONFIG NAMES krb5-config PATHS
+  find_program(KRB5_CONFIG NAMES krb5-config heimdal-krb5-config PATHS
      /opt/local/bin
      ONLY_CMAKE_FIND_ROOT_PATH               # this is required when cross compiling with cmake 2.6 and ignored with cmake 2.4, Alex
   )

plugin/auth_gssapi/gssapi_server.cc

@@ -31,6 +31,9 @@ static void log_error( OM_uint32 major, OM_uint32 minor, const char *msg)
   Generate default principal service name formatted as principal name "mariadb/server.fqdn@REALM"
 */
 #include <krb5.h>
+#ifndef HAVE_KRB5_FREE_UNPARSED_NAME
+#define krb5_free_unparsed_name(a,b) krb5_xfree(b)
+#endif
 static char* get_default_principal_name()
 {
   static char default_name[1024];