Avoid direct cross-module links in hstore_plperl and ltree_plpython, too.

Just turning the crank on the project started in commit d51924be.
These cases turn out to be exact subsets of the boilerplate needed
for hstore_plpython.

Discussion: <2652.1475512158@sss.pgh.pa.us>

contrib/hstore_plperl/Makefile

@@ -23,20 +23,20 @@ include $(top_builddir)/src/Makefile.global
 include $(top_srcdir)/contrib/contrib-global.mk
 endif
 
-# In configurations that forbid undefined symbols in libraries, link with each
-# dependency.  This does preclude pgxs builds.
+# We must link libperl explicitly
 ifeq ($(PORTNAME), aix)
 rpathdir = $(pkglibdir):$(perl_archlibexp)/CORE
-SHLIB_LINK += ../hstore/libhstore.exp $(perl_embed_ldflags)
-endif
+SHLIB_LINK += $(perl_embed_ldflags)
+else
 ifeq ($(PORTNAME), win32)
 # these settings are the same as for plperl
 override CPPFLAGS += -DPLPERL_HAVE_UID_GID -Wno-comment
-SHLIB_LINK += ../hstore/libhstore.a $(sort $(wildcard ../../src/pl/plperl/libperl*.a))
+# ... see silliness in plperl Makefile ...
+SHLIB_LINK += $(sort $(wildcard ../../src/pl/plperl/libperl*.a))
+else
+rpathdir = $(perl_archlibexp)/CORE
+SHLIB_LINK += $(perl_embed_ldflags)
 endif
-
-ifeq ($(PORTNAME), cygwin)
-SHLIB_LINK += -L../hstore -l hstore $(perl_embed_ldflags)
 endif
 
 # As with plperl we need to make sure that the CORE directory is included

contrib/hstore_plperl/hstore_plperl--1.0.sql

@@ -3,11 +3,6 @@
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "CREATE EXTENSION hstore_plperl" to load this file. \quit
 
--- make sure the prerequisite libraries are loaded
-LOAD 'plperl';
-SELECT NULL::hstore;
-
-
 CREATE FUNCTION hstore_to_plperl(val internal) RETURNS internal
 LANGUAGE C STRICT IMMUTABLE
 AS 'MODULE_PATHNAME';

contrib/hstore_plperl/hstore_plperl.c

 #include "postgres.h"
+
 #undef _
+
 #include "fmgr.h"
 #include "plperl.h"
 #include "plperl_helpers.h"
@@ -7,6 +9,58 @@
 
 PG_MODULE_MAGIC;
 
+extern void _PG_init(void);
+
+/* Linkage to functions in hstore module */
+typedef HStore *(*hstoreUpgrade_t) (Datum orig);
+static hstoreUpgrade_t hstoreUpgrade_p;
+typedef int (*hstoreUniquePairs_t) (Pairs *a, int32 l, int32 *buflen);
+static hstoreUniquePairs_t hstoreUniquePairs_p;
+typedef HStore *(*hstorePairs_t) (Pairs *pairs, int32 pcount, int32 buflen);
+static hstorePairs_t hstorePairs_p;
+typedef size_t (*hstoreCheckKeyLen_t) (size_t len);
+static hstoreCheckKeyLen_t hstoreCheckKeyLen_p;
+typedef size_t (*hstoreCheckValLen_t) (size_t len);
+static hstoreCheckValLen_t hstoreCheckValLen_p;
+
+
+/*
+ * Module initialize function: fetch function pointers for cross-module calls.
+ */
+void
+_PG_init(void)
+{
+	/* Asserts verify that typedefs above match original declarations */
+	AssertVariableIsOfType(&hstoreUpgrade, hstoreUpgrade_t);
+	hstoreUpgrade_p = (hstoreUpgrade_t)
+		load_external_function("$libdir/hstore", "hstoreUpgrade",
+							   true, NULL);
+	AssertVariableIsOfType(&hstoreUniquePairs, hstoreUniquePairs_t);
+	hstoreUniquePairs_p = (hstoreUniquePairs_t)
+		load_external_function("$libdir/hstore", "hstoreUniquePairs",
+							   true, NULL);
+	AssertVariableIsOfType(&hstorePairs, hstorePairs_t);
+	hstorePairs_p = (hstorePairs_t)
+		load_external_function("$libdir/hstore", "hstorePairs",
+							   true, NULL);
+	AssertVariableIsOfType(&hstoreCheckKeyLen, hstoreCheckKeyLen_t);
+	hstoreCheckKeyLen_p = (hstoreCheckKeyLen_t)
+		load_external_function("$libdir/hstore", "hstoreCheckKeyLen",
+							   true, NULL);
+	AssertVariableIsOfType(&hstoreCheckValLen, hstoreCheckValLen_t);
+	hstoreCheckValLen_p = (hstoreCheckValLen_t)
+		load_external_function("$libdir/hstore", "hstoreCheckValLen",
+							   true, NULL);
+}
+
+
+/* These defines must be after the module init function */
+#define hstoreUpgrade hstoreUpgrade_p
+#define hstoreUniquePairs hstoreUniquePairs_p
+#define hstorePairs hstorePairs_p
+#define hstoreCheckKeyLen hstoreCheckKeyLen_p
+#define hstoreCheckValLen hstoreCheckValLen_p
+
 
 PG_FUNCTION_INFO_V1(hstore_to_plperl);
 

contrib/hstore_plperl/hstore_plperlu--1.0.sql

@@ -3,11 +3,6 @@
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "CREATE EXTENSION hstore_plperlu" to load this file. \quit
 
--- make sure the prerequisite libraries are loaded
-LOAD 'plperl';
-SELECT NULL::hstore;
-
-
 CREATE FUNCTION hstore_to_plperlu(val internal) RETURNS internal
 LANGUAGE C STRICT IMMUTABLE
 AS 'MODULE_PATHNAME', 'hstore_to_plperl';

contrib/ltree_plpython/Makefile

@@ -4,7 +4,7 @@ MODULE_big = ltree_plpython$(python_majorversion)
 OBJS = ltree_plpython.o $(WIN32RES)
 PGFILEDESC = "ltree_plpython - ltree transform for plpython"
 
-PG_CPPFLAGS = -I$(top_srcdir)/src/pl/plpython $(python_includespec) -I$(top_srcdir)/contrib/ltree
+PG_CPPFLAGS = -I$(top_srcdir)/src/pl/plpython $(python_includespec) -I$(top_srcdir)/contrib/ltree -DPLPYTHON_LIBNAME='"plpython$(python_majorversion)"'
 
 EXTENSION = ltree_plpythonu ltree_plpython2u ltree_plpython3u
 DATA = ltree_plpythonu--1.0.sql ltree_plpython2u--1.0.sql ltree_plpython3u--1.0.sql
@@ -23,19 +23,18 @@ include $(top_builddir)/src/Makefile.global
 include $(top_srcdir)/contrib/contrib-global.mk
 endif
 
-# In configurations that forbid undefined symbols in libraries, link with each
-# dependency.  This does preclude pgxs builds.
+# We must link libpython explicitly
 ifeq ($(PORTNAME), aix)
 rpathdir = $(pkglibdir):$(python_libdir)
-SHLIB_LINK += $(python_libspec) $(python_additional_libs) $(sort $(wildcard ../../src/pl/plpython/libplpython*.exp))
-endif
+SHLIB_LINK += $(python_libspec) $(python_additional_libs)
+else
 ifeq ($(PORTNAME), win32)
-SHLIB_LINK += $(sort $(wildcard ../../src/pl/plpython/libpython*.a)) $(sort $(wildcard ../../src/pl/plpython/libplpython*.a))
+# ... see silliness in plpython Makefile ...
+SHLIB_LINK += $(sort $(wildcard ../../src/pl/plpython/libpython*.a))
+else
+rpathdir = $(python_libdir)
+SHLIB_LINK += $(python_libspec)
 endif
-
-ifeq ($(PORTNAME), cygwin)
-SHLIB_LINK += -L../ltree -lltree -L../../src/pl/plpython \
-	-lplpython$(python_majorversion) $(python_libspec)
 endif
 
 REGRESS_OPTS += --load-extension=ltree

contrib/ltree_plpython/ltree_plpython.c

 #include "postgres.h"
+
 #include "fmgr.h"
 #include "plpython.h"
 #include "ltree.h"
 
 PG_MODULE_MAGIC;
 
+extern void _PG_init(void);
+
+/* Linkage to functions in plpython module */
+#if PY_MAJOR_VERSION >= 3
+typedef PyObject *(*PLyUnicode_FromStringAndSize_t) (const char *s, Py_ssize_t size);
+static PLyUnicode_FromStringAndSize_t PLyUnicode_FromStringAndSize_p;
+#endif
+
+
+/*
+ * Module initialize function: fetch function pointers for cross-module calls.
+ */
+void
+_PG_init(void)
+{
+	/* Asserts verify that typedefs above match original declarations */
+#if PY_MAJOR_VERSION >= 3
+	AssertVariableIsOfType(&PLyUnicode_FromStringAndSize, PLyUnicode_FromStringAndSize_t);
+	PLyUnicode_FromStringAndSize_p = (PLyUnicode_FromStringAndSize_t)
+		load_external_function("$libdir/" PLPYTHON_LIBNAME, "PLyUnicode_FromStringAndSize",
+							   true, NULL);
+#endif
+}
+
+
+/* These defines must be after the module init function */
+#define PLyUnicode_FromStringAndSize PLyUnicode_FromStringAndSize_p
+
 
 PG_FUNCTION_INFO_V1(ltree_to_plpython);
 

contrib/ltree_plpython/ltree_plpython2u--1.0.sql

@@ -3,11 +3,6 @@
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "CREATE EXTENSION ltree_plpython2u" to load this file. \quit
 
--- make sure the prerequisite libraries are loaded
-LOAD 'plpython2';
-SELECT NULL::ltree;
-
-
 CREATE FUNCTION ltree_to_plpython2(val internal) RETURNS internal
 LANGUAGE C STRICT IMMUTABLE
 AS 'MODULE_PATHNAME', 'ltree_to_plpython';

contrib/ltree_plpython/ltree_plpython3u--1.0.sql

@@ -3,11 +3,6 @@
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "CREATE EXTENSION ltree_plpython3u" to load this file. \quit
 
--- make sure the prerequisite libraries are loaded
-LOAD 'plpython3';
-SELECT NULL::ltree;
-
-
 CREATE FUNCTION ltree_to_plpython3(val internal) RETURNS internal
 LANGUAGE C STRICT IMMUTABLE
 AS 'MODULE_PATHNAME', 'ltree_to_plpython';

contrib/ltree_plpython/ltree_plpythonu--1.0.sql

@@ -3,11 +3,6 @@
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "CREATE EXTENSION ltree_plpythonu" to load this file. \quit
 
--- make sure the prerequisite libraries are loaded
-LOAD 'plpython2';  -- change to plpython3 if that ever becomes the default
-SELECT NULL::ltree;
-
-
 CREATE FUNCTION ltree_to_plpython(val internal) RETURNS internal
 LANGUAGE C STRICT IMMUTABLE
 AS 'MODULE_PATHNAME';

src/tools/msvc/Mkvcbuild.pm

@@ -480,10 +480,11 @@ sub mkvcbuild
 			'plpython' . $pymajorver,        'src/pl/plpython',
 			'hstore',                        'contrib/hstore');
 		$hstore_plpython->AddDefine('PLPYTHON_LIBNAME="plpython' . $pymajorver . '"');
-		AddTransformModule(
+		my $ltree_plpython = AddTransformModule(
 			'ltree_plpython' . $pymajorver, 'contrib/ltree_plpython',
 			'plpython' . $pymajorver,       'src/pl/plpython',
 			'ltree',                        'contrib/ltree');
+		$ltree_plpython->AddDefine('PLPYTHON_LIBNAME="plpython' . $pymajorver . '"');
 	}
 
 	if ($solution->{options}->{perl})