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head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml

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<sect3 xml:id="options-prevents"> <sect3 xml:id="options-prevents">
<title><varname><replaceable>OPT</replaceable>_PREVENTS</varname> <title><varname><replaceable>OPT</replaceable>_PREVENTS</varname>
and and
<varname><replaceable>OPT</replaceable>_PREVENTS_MSG</varname></title> <varname><replaceable>OPT</replaceable>_PREVENTS_MSG</varname></title>
<para>Provides a way to add conflicts between options.</para> <para>Provides a way to add conflicts between options.</para>
<para>When <replaceable>OPT</replaceable> is selected, all the <para>When <replaceable>OPT</replaceable> is selected, all the
options listed in this variable must be un-selected. If options listed in <varname><replaceable>OPT</replaceable>_PREVENTS</varname>
<varname><replaceable>OPT</replaceable>_PREVENTS_MSG</varname> must be un-selected. If <varname><replaceable>OPT</replaceable>_PREVENTS_MSG</varname>
is also selected, its content will be shown, explaining why is set and a conflict is triggered, its content will be shown explaining
they conflict. For example:</para> why they conflict. For example:</para>
<programlisting>OPTIONS_DEFINE= OPT1 OPT2 <programlisting>OPTIONS_DEFINE= OPT1 OPT2
OPT1_PREVENTS= OPT2 OPT1_PREVENTS= OPT2
OPT1_PREVENTS_MSG= OPT1 and OPT2 enable conflicting options</programlisting> OPT1_PREVENTS_MSG= OPT1 and OPT2 enable conflicting options</programlisting>
<para>Is roughly equivalent to:</para> <para>Is roughly equivalent to:</para>
<programlisting>OPTIONS_DEFINE= OPT1 OPT2 <programlisting>OPTIONS_DEFINE= OPT1 OPT2
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