Change PL/Tcl build to use configured compiler and Makefile.shlib

system, not Tcl-provided one.

Make sure export file, if any, is cleaned.

Tcl configuration is now read directly in configure and recorded in
Makefile.global.  This eliminates some duplicate efforts and allows
for easier hand-editing of the results, if necessary.

configure.in

@@ -1,6 +1,6 @@
 dnl Process this file with autoconf to produce a configure script.
-dnl $Header: /cvsroot/pgsql/configure.in,v 1.184 2002/05/05 00:03:28 tgl Exp $
-
+dnl $Header: /cvsroot/pgsql/configure.in,v 1.185 2002/05/24 18:10:17 petere Exp $
+dnl
 dnl Developers, please strive to achieve this order:
 dnl
 dnl 0. Initialization and options processing
@@ -14,7 +14,9 @@ dnl 7. Functions, global variables
 dnl 8. System services
 dnl
 dnl Read the Autoconf manual for details.
-
+dnl
+m4_pattern_forbid(^PGAC_)dnl to catch undefined macros
+dnl
 dnl The GNU folks apparently haven't heard that some people don't use
 dnl Texinfo. Use this sorcery to use "docdir" instead of "infodir".
 m4_define([info], [doc])
@@ -1201,11 +1203,15 @@ fi
 # Check for Tcl configuration script tclConfig.sh
 if test "$with_tcl" = yes; then
     PGAC_PATH_TCLCONFIGSH([$with_tclconfig])
+    PGAC_EVAL_TCLCONFIGSH([$TCL_CONFIG_SH],
+                          [TCL_LIB_FILE,TCL_LIBS,TCL_LIB_SPEC,TCL_SHARED_BUILD])
+    AC_SUBST(TCL_SHLIB_LD_LIBS)dnl don't want to double-evaluate that one
 fi
 
 # Check for Tk configuration script tkConfig.sh
 if test "$with_tk" = yes; then
     PGAC_PATH_TKCONFIGSH([$with_tkconfig $with_tclconfig])
+    PGAC_EVAL_TCLCONFIGSH([$TK_CONFIG_SH], [TK_LIBS,TK_LIB_SPEC,TK_XINCLUDES])
 fi