m</code></em>. This
    command can be used to undo the effect of the command
    <a class="citerefentry" href="glAttachShader"><span class="citerefentry"><span class="refentrytitle">glAttachShader</span></span></a>.</p>
        <p>If <em class="parameter"><code>shader</code></em> has already been flagged
    for deletion by a call to
    <a class="citerefentry" href="glDeleteShader"><span class="citerefentry"><span class="refentrytitle">glDeleteShader</span></span></a>
    and it is not attached to any oth