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-rw-r--r--doc/src/sgml/extend.sgml14
1 files changed, 12 insertions, 2 deletions
diff --git a/doc/src/sgml/extend.sgml b/doc/src/sgml/extend.sgml
index 1b1adae1a63..695e07fb384 100644
--- a/doc/src/sgml/extend.sgml
+++ b/doc/src/sgml/extend.sgml
@@ -1227,8 +1227,13 @@ include $(PGXS)
<term><varname>HEADERS_built</varname></term>
<listitem>
<para>
- files to (optionally build and) install under
- <literal><replaceable>prefix</replaceable>/include/server/$MODULEDIR/$MODULE_big</literal>
+ Files to (optionally build and) install under
+ <literal><replaceable>prefix</replaceable>/include/server/$MODULEDIR/$MODULE_big</literal>.
+ </para>
+ <para>
+ Unlike <literal>DATA_built</literal>, files in <literal>HEADERS_built</literal>
+ are not removed by the <literal>clean</literal> target; if you want them removed,
+ also add them to <literal>EXTRA_CLEAN</literal> or add your own rules to do it.
</para>
</listitem>
</varlistentry>
@@ -1244,6 +1249,11 @@ include $(PGXS)
in <literal>MODULES</literal> or <literal>MODULE_big</literal>.
</para>
<para>
+ Unlike <literal>DATA_built</literal>, files in <literal>HEADERS_built_$MODULE</literal>
+ are not removed by the <literal>clean</literal> target; if you want them removed,
+ also add them to <literal>EXTRA_CLEAN</literal> or add your own rules to do it.
+ </para>
+ <para>
It is legal to use both variables for the same module, or any
combination, unless you have two module names in the
<literal>MODULES</literal> list that differ only by the presence of a