Add NO_INSTALL option to pgxs

Apply in libpq_pipeline test makefile, so that the test file is not
installed into tmp_install.
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/cb9d16a6-760f-cd44-28d6-b091d5fb6ca7%40enterprisedb.com

doc/src/sgml/extend.sgml

@@ -1672,6 +1672,16 @@ include $(PGXS)
       </listitem>
      </varlistentry>
 
+     <varlistentry>
+      <term><varname>NO_INSTALL</varname></term>
+      <listitem>
+       <para>
+        don't define an <literal>install</literal> target, useful for test
+        modules that don't need their build products to be installed
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry>
       <term><varname>NO_INSTALLCHECK</varname></term>
       <listitem>

src/makefiles/pgxs.mk

@@ -49,6 +49,8 @@
 #   TAP_TESTS -- switch to enable TAP tests
 #   ISOLATION -- list of isolation test cases
 #   ISOLATION_OPTS -- additional switches to pass to pg_isolation_regress
+#   NO_INSTALL -- don't define an install target, useful for test modules
+#     that don't need their build products to be installed
 #   NO_INSTALLCHECK -- don't define an installcheck target, useful e.g. if
 #     tests require special configuration, or don't use pg_regress
 #   EXTRA_CLEAN -- extra files to remove in 'make clean'
@@ -227,6 +229,8 @@ all: all-lib
 endif # MODULE_big
 
 
+ifndef NO_INSTALL
+
 install: all installdirs
 ifneq (,$(EXTENSION))
 	$(INSTALL_DATA) $(addprefix $(srcdir)/, $(addsuffix .control, $(EXTENSION))) '$(DESTDIR)$(datadir)/extension/'
@@ -336,6 +340,15 @@ endif # with_llvm
 uninstall: uninstall-lib
 endif # MODULE_big
 
+else # NO_INSTALL
+
+# Need this so that temp-install builds artifacts not meant for
+# installation (Normally, check should depend on all, but we don't do
+# that because of parallel make risk (dbf2ec1a1c0).)
+install: all
+
+endif # NO_INSTALL
+
 
 clean:
 ifdef MODULES

src/test/modules/libpq_pipeline/Makefile

@@ -3,6 +3,8 @@
 PROGRAM = libpq_pipeline
 OBJS = libpq_pipeline.o
 
+NO_INSTALL = 1
+
 PG_CPPFLAGS = -I$(libpq_srcdir)
 PG_LIBS_INTERNAL += $(libpq_pgport)