Install TAP test infrastructure so it's available for extension testing.

When configured with --enable-tap-tests, "make install" will now install
the Perl support files for TAP testing where PGXS will find them.
This allows extensions to rely on $(prove_check) even when being built
out-of-tree.  Back-patch to 9.4 where we first started to support TAP
testing, to reduce the number of cases extension makefiles need to
consider.

Craig Ringer

Discussion: <CAMsr+YFXv+2qne6xJW7z_25mYBtktRX5rpkrgrb+DRgQ_FxgHQ@mail.gmail.com>

src/Makefile

@@ -26,7 +26,8 @@ SUBDIRS = \
 	bin \
 	pl \
 	makefiles \
-	test/regress
+	test/regress \
+	test/perl
 
 # There are too many interdependencies between the subdirectories, so
 # don't attempt parallel make here.

src/test/Makefile

@@ -12,7 +12,7 @@ subdir = src/test
 top_builddir = ../..
 include $(top_builddir)/src/Makefile.global
 
-SUBDIRS = regress isolation modules recovery
+SUBDIRS = perl regress isolation modules recovery
 
 # We don't build or execute examples/, locale/, or thread/ by default,
 # but we do want "make clean" etc to recurse into them.  Likewise for ssl/,

src/test/perl/Makefile

@@ -0,0 +1,33 @@
+#-------------------------------------------------------------------------
+#
+# Makefile for src/test/perl
+#
+# Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
+# Portions Copyright (c) 1994, Regents of the University of California
+#
+# src/test/perl/Makefile
+#
+#-------------------------------------------------------------------------
+
+subdir = src/test/perl
+top_builddir = ../../..
+include $(top_builddir)/src/Makefile.global
+
+ifeq ($(enable_tap_tests),yes)
+
+installdirs:
+	$(MKDIR_P) '$(DESTDIR)$(pgxsdir)/$(subdir)'
+
+install: all installdirs
+	$(INSTALL_DATA) $(srcdir)/TestLib.pm '$(DESTDIR)$(pgxsdir)/$(subdir)/TestLib.pm'
+	$(INSTALL_DATA) $(srcdir)/SimpleTee.pm '$(DESTDIR)$(pgxsdir)/$(subdir)/SimpleTee.pm'
+	$(INSTALL_DATA) $(srcdir)/RecursiveCopy.pm '$(DESTDIR)$(pgxsdir)/$(subdir)/RecursiveCopy.pm'
+	$(INSTALL_DATA) $(srcdir)/PostgresNode.pm '$(DESTDIR)$(pgxsdir)/$(subdir)/PostgresNode.pm'
+
+uninstall:
+	rm -f '$(DESTDIR)$(pgxsdir)/$(subdir)/TestLib.pm'
+	rm -f '$(DESTDIR)$(pgxsdir)/$(subdir)/SimpleTee.pm'
+	rm -f '$(DESTDIR)$(pgxsdir)/$(subdir)/RecursiveCopy.pm'
+	rm -f '$(DESTDIR)$(pgxsdir)/$(subdir)/PostgresNode.pm'
+
+endif