From: Bjorn Munch
Date: August 24 2012 8:45am
Subject: Re: have_example_plugin.inc incorrect test
List-Archive: http://lists.mysql.com/internals/38577
Message-Id: <20120824084529.GA8021@khepri15.no.oracle.com>
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On 24/08 10.48, Stewart Smith wrote:
> You may notice that the tests that use the example plugin are never
> run. This is because the test in include/have_example_plugin.inc is
> incorrect for mtr v2 (yes, this has been broken for a while).
....
> 
> --- a/mysql-test/include/have_example_plugin.inc	2012-01-20 11:35:48 +0000
> +++ b/mysql-test/include/have_example_plugin.inc	2012-08-24 00:38:20 +0000
> @@ -8,7 +8,7 @@ if (`SELECT @@have_dynamic_loading != 'Y
>  #
>  # Check if the variable EXAMPLE_PLUGIN is set
>  #
> -if (!$EXAMPLE_PLUGIN) {
> +if (!$EXAMPLE_PLUGIN_OPT) {
>    --skip Example plugin requires the environment variable \$EXAMPLE_PLUGIN to be set (normally done by mtr)

I don't understand this. If the example plugin is present, then *both*
these environment variables will be set (to non-empty).

However, in MySQL 5.1, $EXAMPLE_PLUGIN_OPT will in fact always be set
but if the example plugin is not present it will be set to
"--plugin-dir=" which is of little use. Perhaps that is what you are
seeing?

In 5.5 and up they should both be set to something meaningful or they
should both be empty. But never one empty and one non-empty.

- Bjorn Munch