Add test to mysql-test-run.pl to see if the udf_example.so is availble. Set...

Add test to mysql-test-run.pl to see if the udf_example.so is availble. Set envioronment variable UDF_EXAMPLE_LIB if it is.
Then check in have_udf if that variable is set. Finally use tahe variable when loading the shared library. 

mysql-test/include/have_udf.inc

@@ -6,3 +6,11 @@
 disable_query_log;
 show variables like "have_dynamic_loading";
 enable_query_log;
+
+#
+# Check if the variable UDF_EXAMPLE_LIB is set
+#
+--require r/have_udf_example.require
+disable_query_log;
+eval select LENGTH("$UDF_EXAMPLE_LIB") > 0 as "have_udf_example_lib";
+enable_query_log;

mysql-test/lib/mtr_misc.pl

@@ -12,6 +12,7 @@ sub mtr_init_args ($);
 sub mtr_add_arg ($$@);
 sub mtr_path_exists(@);
 sub mtr_script_exists(@);
+sub mtr_file_exists(@);
 sub mtr_exe_exists(@);
 sub mtr_copy_dir($$);
 sub mtr_same_opts($$);
@@ -94,6 +95,21 @@ sub mtr_script_exists (@) {
   }
 }
 
+sub mtr_file_exists (@) {
+  foreach my $path ( @_ )
+  {
+    return $path if -e $path;
+  }
+  if ( @_ == 1 )
+  {
+    mtr_error("Could not find $_[0]");
+  }
+  else
+  {
+    mtr_error("Could not find any of " . join(" ", @_));
+  }
+}
+
 sub mtr_exe_exists (@) {
   my @path= @_;
   map {$_.= ".exe"} @path if $::glob_win32;

mysql-test/mysql-test-run.pl

@@ -188,6 +188,7 @@ our $exe_mysqltest;
 our $exe_slave_mysqld;
 our $exe_im;
 our $exe_my_print_defaults;
+our $lib_udf_example;
 
 our $opt_bench= 0;
 our $opt_small_bench= 0;
@@ -1057,6 +1058,8 @@ sub executable_setup () {
       mtr_script_exists("$glob_basedir/scripts/mysql_fix_privilege_tables");
     $path_ndb_tools_dir= mtr_path_exists("$glob_basedir/ndb/tools");
     $exe_ndb_mgm=        "$glob_basedir/ndb/src/mgmclient/ndb_mgm";
+    $lib_udf_example=
+      mtr_file_exists("$glob_basedir/sql/.libs/udf_example.so");
   }
   else
   {
@@ -2936,6 +2939,7 @@ sub run_mysqltest ($) {
   $ENV{'MYSQL_CLIENT_TEST'}=        $cmdline_mysql_client_test;
   $ENV{'CHARSETSDIR'}=              $path_charsetsdir;
   $ENV{'MYSQL_MY_PRINT_DEFAULTS'}=  $exe_my_print_defaults;
+  $ENV{'UDF_EXAMPLE_LIB'}=          basename($lib_udf_example);
 
   $ENV{'NDB_MGM'}=                  $exe_ndb_mgm;
   $ENV{'NDB_BACKUP_DIR'}=           $path_ndb_data_dir;

mysql-test/r/have_udf_example.require

+have_udf_example_lib
+1

mysql-test/r/udf.result

 drop table if exists t1;
-CREATE FUNCTION metaphon RETURNS STRING SONAME 'udf_example.so';
-CREATE FUNCTION myfunc_double RETURNS REAL SONAME 'udf_example.so';
-CREATE FUNCTION myfunc_nonexist RETURNS INTEGER SONAME 'udf_example.so';
+CREATE FUNCTION metaphon RETURNS STRING SONAME "UDF_EXAMPLE_LIB";
+CREATE FUNCTION myfunc_double RETURNS REAL SONAME "UDF_EXAMPLE_LIB";
+CREATE FUNCTION myfunc_nonexist RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
 ERROR HY000: Can't find function 'myfunc_nonexist' in library
-CREATE FUNCTION myfunc_int RETURNS INTEGER SONAME 'udf_example.so';
-CREATE FUNCTION sequence RETURNS INTEGER SONAME "udf_example.so";
-CREATE FUNCTION lookup RETURNS STRING SONAME 'udf_example.so';
+CREATE FUNCTION myfunc_int RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
+CREATE FUNCTION sequence RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
+CREATE FUNCTION lookup RETURNS STRING SONAME "UDF_EXAMPLE_LIB";
 CREATE FUNCTION reverse_lookup
-RETURNS STRING SONAME 'udf_example.so';
+RETURNS STRING SONAME "UDF_EXAMPLE_LIB";
 CREATE AGGREGATE FUNCTION avgcost
-RETURNS REAL SONAME 'udf_example.so';
+RETURNS REAL SONAME "UDF_EXAMPLE_LIB";
 select myfunc_double();
 ERROR HY000: myfunc_double must have at least one argument
 select myfunc_double(1);

mysql-test/t/disabled.def

@@ -12,4 +12,3 @@
 
 sp-goto         : GOTO is currently is disabled - will be fixed in the future
 ndb_load        : Bug#17233
-udf             : Bug#18564

mysql-test/t/udf.test

@@ -14,18 +14,26 @@ drop table if exists t1;
 # Create the example functions from udf_example
 #
 
-CREATE FUNCTION metaphon RETURNS STRING SONAME 'udf_example.so';
-CREATE FUNCTION myfunc_double RETURNS REAL SONAME 'udf_example.so';
+--replace_result $UDF_EXAMPLE_LIB UDF_EXAMPLE_LIB
+eval CREATE FUNCTION metaphon RETURNS STRING SONAME "$UDF_EXAMPLE_LIB";
+--replace_result $UDF_EXAMPLE_LIB UDF_EXAMPLE_LIB
+eval CREATE FUNCTION myfunc_double RETURNS REAL SONAME "$UDF_EXAMPLE_LIB";
 
+--replace_result $UDF_EXAMPLE_LIB UDF_EXAMPLE_LIB
 --error ER_CANT_FIND_DL_ENTRY
-CREATE FUNCTION myfunc_nonexist RETURNS INTEGER SONAME 'udf_example.so';
-CREATE FUNCTION myfunc_int RETURNS INTEGER SONAME 'udf_example.so';
-CREATE FUNCTION sequence RETURNS INTEGER SONAME "udf_example.so";
-CREATE FUNCTION lookup RETURNS STRING SONAME 'udf_example.so';
-CREATE FUNCTION reverse_lookup
-        RETURNS STRING SONAME 'udf_example.so';
-CREATE AGGREGATE FUNCTION avgcost
-        RETURNS REAL SONAME 'udf_example.so';
+eval CREATE FUNCTION myfunc_nonexist RETURNS INTEGER SONAME "$UDF_EXAMPLE_LIB";
+--replace_result $UDF_EXAMPLE_LIB UDF_EXAMPLE_LIB
+eval CREATE FUNCTION myfunc_int RETURNS INTEGER SONAME "$UDF_EXAMPLE_LIB";
+--replace_result $UDF_EXAMPLE_LIB UDF_EXAMPLE_LIB
+eval CREATE FUNCTION sequence RETURNS INTEGER SONAME "$UDF_EXAMPLE_LIB";
+--replace_result $UDF_EXAMPLE_LIB UDF_EXAMPLE_LIB
+eval CREATE FUNCTION lookup RETURNS STRING SONAME "$UDF_EXAMPLE_LIB";
+--replace_result $UDF_EXAMPLE_LIB UDF_EXAMPLE_LIB
+eval CREATE FUNCTION reverse_lookup
+        RETURNS STRING SONAME "$UDF_EXAMPLE_LIB";
+--replace_result $UDF_EXAMPLE_LIB UDF_EXAMPLE_LIB
+eval CREATE AGGREGATE FUNCTION avgcost
+        RETURNS REAL SONAME "$UDF_EXAMPLE_LIB";
 
 --error 0
 select myfunc_double();