Attached patch for unconditional enabling of pltcl-unknown support.

Enabling this feature adds very light overhead of 1 select from pg_class on
first using of pl/tcl in backend if unknown suppport is really unused.
But pl/tcl with this support has very improved functionality.

Patch includes changes to documentation.

configure.in

@@ -382,22 +382,6 @@ PGAC_ARG_REQ(with, tclconfig, [  --with-tclconfig=DIR    tclConfig.sh and tkConf
 
 PGAC_ARG_REQ(with, tkconfig,  [  --with-tkconfig=DIR     tkConfig.sh is in DIR])
 
-
-#
-# If Tcl is enabled (above) then check for pltcl_unknown_support
-#
-AC_MSG_CHECKING([whether to build with PL/Tcl unknown support])
-if test "$with_tcl" = yes; then
-  PGAC_ARG_BOOL(enable, pltcl-unknown, no,
-                [  --enable-pltcl-unknown  build PL/Tcl unknown support (if Tcl is enabled)],
-                [AC_DEFINE([ENABLE_PLTCL_UNKNOWN])])
-else
-  enable_pltcl_unknown=no
-fi
-AC_MSG_RESULT([$enable_pltcl_unknown])
-AC_SUBST([enable_pltcl_unknown])
-
-
 #
 # Optionally build Perl modules (Pg.pm and PL/Perl)
 #

doc/src/sgml/installation.sgml

-<!-- $Header: /cvsroot/pgsql/doc/src/sgml/installation.sgml,v 1.61 2001/10/09 22:32:32 petere Exp $ -->
+<!-- $Header: /cvsroot/pgsql/doc/src/sgml/installation.sgml,v 1.62 2001/10/13 04:23:50 momjian Exp $ -->
 
 <chapter id="installation">
  <title><![%standalone-include[<productname>PostgreSQL</>]]>
@@ -683,15 +683,6 @@ su - postgres
        </listitem>
       </varlistentry>
 
-      <varlistentry>
-       <term><option>--enable-pltcl-unknown</option></term>
-       <listitem>
-        <para>
-         Enables enables PL/Tcl unknown support.
-        </para>
-       </listitem>
-      </varlistentry>
-
       <varlistentry>
        <term><option>--enable-odbc</option></term>
        <listitem>

doc/src/sgml/pltcl.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/pltcl.sgml,v 2.14 2001/09/13 15:55:23 petere Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/pltcl.sgml,v 2.15 2001/10/13 04:23:50 momjian Exp $
 -->
 
  <chapter id="pltcl">
@@ -513,11 +513,13 @@ CREATE FUNCTION t1_count(int4, int4) RETURNS int4 AS '
       </listitem>
      </varlistentry>
 
-     <varlistentry>
-      <term>
-       Modules and the <function>unknown</> command
-      </term>
-      <listitem>
+
+    </variablelist>
+
+   </sect2>
+
+   <sect2>
+       <title> Modules and the <function>unknown</> command</title>
        <para>
 	PL/Tcl has a special support for things often used. It
 	recognizes two magic tables, <literal>pltcl_modules</> and
@@ -526,20 +528,15 @@ CREATE FUNCTION t1_count(int4, int4) RETURNS int4 AS '
 	creation. Whenever an unknown Tcl procedure is called, the
 	unknown proc is asked to check if the procedure is defined in
 	one of the modules. If this is true, the module is loaded on
-	demand.  To enable this behavior, the
-	<productname>PostgreSQL</> must be configured with the option
-	<option>--enable-pltcl-unknown</option>.
+	demand.
        </para>
        <para>
-	There are support scripts to maintain these tables in the modules
-	subdirectory of the PL/Tcl source including the source for the
-	unknown module that must get installed initially.
+	There are support scripts to maintain these tables:
+	<command>pltcl_loadmod</>,<command>pltcl_listmod</>,
+	<command>pltcl_delmod</> and source for the
+	unknown module <filename>share/unknown.pltcl</> that must be loaded
+	into database initially for getting unknown support.
        </para>
-      </listitem>
-     </varlistentry>
-
-    </variablelist>
-
    </sect2>
 
   </sect1>

src/include/pg_config.h.in

@@ -8,7 +8,7 @@
  * or in pg_config.h afterwards.  Of course, if you edit pg_config.h, then your
  * changes will be overwritten the next time you run configure.
  *
- * $Id: pg_config.h.in,v 1.8 2001/10/01 15:33:31 momjian Exp $
+ * $Id: pg_config.h.in,v 1.9 2001/10/13 04:23:50 momjian Exp $
  */
 
 #ifndef PG_CONFIG_H
@@ -86,9 +86,6 @@
  */
 #undef DEF_MAXBACKENDS
 
-/* --enable-pltcl-unknown */
-#undef ENABLE_PLTCL_UNKNOWN
-
 /* --enable-nls */
 #undef ENABLE_NLS
 

src/pl/tcl/Makefile

@@ -2,7 +2,7 @@
 #
 # Makefile for the pltcl shared object
 #
-# $Header: /cvsroot/pgsql/src/pl/tcl/Makefile,v 1.34 2001/09/16 16:11:11 petere Exp $
+# $Header: /cvsroot/pgsql/src/pl/tcl/Makefile,v 1.35 2001/10/13 04:23:50 momjian Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -86,29 +86,21 @@ endif
 ifeq ($(TCL_SHARED_BUILD), 1)
 
 all: $(INFILES)
-ifeq ($(enable_pltcl_unknown), yes)
 	$(MAKE) -C modules $@
-endif
 
 pltcl$(DLSUFFIX): pltcl.o
 
 install: all installdirs
 	$(INSTALL_SHLIB) $(DLOBJS) $(DESTDIR)$(pkglibdir)/$(DLOBJS)
-ifeq ($(enable_pltcl_unknown), yes)
 	$(MAKE) -C modules $@
-endif
 
 installdirs:
 	$(mkinstalldirs) $(DESTDIR)$(pkglibdir)
-ifeq ($(enable_pltcl_unknown), yes)
 	$(MAKE) -C modules $@
-endif
 
 uninstall:
 	rm -f $(DESTDIR)$(pkglibdir)/$(DLOBJS)
-ifeq ($(enable_pltcl_unknown), yes)
 	$(MAKE) -C modules $@
-endif
 
 else # TCL_SHARED_BUILD = 0
 
@@ -124,6 +116,4 @@ Makefile.tcldefs: mkMakefile.tcldefs.sh
 
 clean distclean maintainer-clean:
 	rm -f $(INFILES) pltcl.o Makefile.tcldefs
-ifeq ($(enable_pltcl_unknown), yes)
 	$(MAKE) -C modules $@
-endif

src/pl/tcl/pltcl.c

@@ -31,7 +31,7 @@
  *	  ENHANCEMENTS, OR MODIFICATIONS.
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/pl/tcl/pltcl.c,v 1.43 2001/10/06 23:21:45 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/pl/tcl/pltcl.c,v 1.44 2001/10/13 04:23:50 momjian Exp $
  *
  **********************************************************************/
 
@@ -146,9 +146,7 @@ static FunctionCallInfo pltcl_current_fcinfo = NULL;
 static void pltcl_init_all(void);
 static void pltcl_init_interp(Tcl_Interp *interp);
 
-#ifdef ENABLE_PLTCL_UNKNOWN
 static void pltcl_init_load_unknown(Tcl_Interp *interp);
-#endif
 
 Datum		pltcl_call_handler(PG_FUNCTION_ARGS);
 Datum		pltclu_call_handler(PG_FUNCTION_ARGS);
@@ -293,7 +291,6 @@ pltcl_init_interp(Tcl_Interp *interp)
 	Tcl_CreateCommand(interp, "spi_lastoid",
 					  pltcl_SPI_lastoid, NULL, NULL);
 					  
-#ifdef ENABLE_PLTCL_UNKNOWN
 	/************************************************************
 	 * Try to load the unknown procedure from pltcl_modules
 	 ************************************************************/
@@ -302,12 +299,9 @@ pltcl_init_interp(Tcl_Interp *interp)
 	pltcl_init_load_unknown(interp);
 	if (SPI_finish() != SPI_OK_FINISH)
 		elog(ERROR, "pltcl_init_interp(): SPI_finish failed");
-#endif	 /* ENABLE_PLTCL_UNKNOWN */
 }
 
 
-#ifdef ENABLE_PLTCL_UNKNOWN
-
 /**********************************************************************
  * pltcl_init_load_unknown()	- Load the unknown procedure from
  *				  table pltcl_modules (if it exists)
@@ -380,8 +374,6 @@ pltcl_init_load_unknown(Tcl_Interp *interp)
 	Tcl_DStringFree(&unknown_src);
 }
 
-#endif	 /* ENABLE_PLTCL_UNKNOWN */
-
 
 /**********************************************************************
  * pltcl_call_handler		- This is the only visible function