Use RTLD_NOW, not RTLD_LAZY, as binding mode for dlopen() on all platforms.

This restores the Linux behavior to what it was in PG 7.0 and 7.1, and
causes other platforms to agree.  (Other well-tested platforms like HPUX
were doing it this way already.)  Per pghackers discussion over the past
month or so.

src/backend/port/dynloader/README.dlfcn.aix

@@ -39,8 +39,8 @@ table. If the path does not contain a '/' character, dlopen will search
 for the module using the LIBPATH environment variable. It returns an
 opaque handle to the module or NULL on error. The mode parameter can be
 either RTLD_LAZY (for lazy function binding) or RTLD_NOW for immediate
-function binding. The AIX implementation currently does treat RTLD_NOW
+function binding. The AIX implementation currently behaves as RTLD_NOW
-the same as RTLD_LAZY. The flag RTLD_GLOBAL might be or'ed into the
+even if RTLD_LAZY is specified. The flag RTLD_GLOBAL might be or'ed into the
 mode parameter to allow loaded modules to bind to global variables or
 functions in other loaded modules loaded by dlopen(). If RTLD_GLOBAL is
 not specified, only globals from the main part of the executable or

src/backend/port/dynloader/aix.h

@@ -1,5 +1,5 @@
 /*
- * $Id: aix.h,v 1.10 2001/11/08 20:37:52 momjian Exp $
+ * $Id: aix.h,v 1.11 2002/02/12 23:39:46 tgl Exp $
  *
  * @(#)dlfcn.h	1.4 revision of 95/04/25  09:36:52
  * This is an unpublished work copyright (c) 1992 HELIOS Software GmbH
@@ -57,7 +57,7 @@ int			dlclose();
 
 #include "utils/dynamic_loader.h"
 
-#define  pg_dlopen(f)	dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+#define  pg_dlopen(f)	dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define  pg_dlsym	dlsym
 #define  pg_dlclose dlclose
 #define  pg_dlerror dlerror

src/backend/port/dynloader/bsdi.h

@@ -1,12 +1,12 @@
 /*-------------------------------------------------------------------------
  *
+ * bsdi.h
  *		Dynamic loader interface for BSD/OS
  *
- *
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * port_protos.h,v 1.2 1995/05/25 22:51:03 andrew Exp
+ * $Id: bsdi.h,v 1.15 2002/02/12 23:39:57 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -19,7 +19,21 @@
 #ifdef HAVE_DLOPEN
 
 #include <dlfcn.h>
-#define		  pg_dlopen(f)	  dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+#define		  pg_dlopen(f)	  dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define		  pg_dlsym		  dlsym
 #define		  pg_dlclose	  dlclose
 #define		  pg_dlerror	  dlerror
@@ -32,6 +46,7 @@ do { \
 	dld_unlink_by_file(handle, 1); \
 	free(handle); \
 } while (0)
+
 #endif   /* not HAVE_DLOPEN */
 
 #endif   /* PORT_PROTOS_H */

src/backend/port/dynloader/dgux.h

@@ -5,7 +5,7 @@
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: dgux.h,v 1.13 2001/11/05 17:46:27 momjian Exp $
+ * $Id: dgux.h,v 1.14 2002/02/12 23:40:03 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -21,9 +21,22 @@
  * this dynamic loader uses the system dynamic loading interface for shared
  * libraries (ie. dlopen/dlsym/dlclose). The user must specify a shared
  * library as the file to be dynamically loaded.
- *
  */
-#define pg_dlopen(f)  dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+#define pg_dlopen(f)	dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define pg_dlsym		dlsym
 #define pg_dlclose		dlclose
 #define pg_dlerror		dlerror

src/backend/port/dynloader/freebsd.h

@@ -1,13 +1,12 @@
 /*-------------------------------------------------------------------------
  *
- * port_protos.h
+ * freebsd.h
- *	  port-specific prototypes for NetBSD 1.0
+ *	  port-specific prototypes for FreeBSD
- *
  *
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: freebsd.h,v 1.14 2002/02/11 21:38:11 petere Exp $
+ * $Id: freebsd.h,v 1.15 2002/02/12 23:40:12 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -21,7 +20,6 @@
 
 #include "utils/dynamic_loader.h"
 
-/* dynloader.c */
 /*
  * Dynamic Loader on NetBSD 1.0.
  *
@@ -35,11 +33,20 @@
  * NetBSD (like 1.0, and 1.0A pre June 1995) have no dlerror.)
  */
 
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
 #ifndef RTLD_GLOBAL
 #define RTLD_GLOBAL 0
 #endif
 
-#define		   pg_dlopen(f)    BSD44_derived_dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+#define		   pg_dlopen(f)    BSD44_derived_dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define		   pg_dlsym		   BSD44_derived_dlsym
 #define		   pg_dlclose	   BSD44_derived_dlclose
 #define		   pg_dlerror	   BSD44_derived_dlerror

src/backend/port/dynloader/irix5.h

@@ -1,13 +1,13 @@
 /*-------------------------------------------------------------------------
  *
- * port_protos.h
+ * irix5.h
  *	  port-specific prototypes for Irix 5
  *
  *
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * port_protos.h,v 1.2 1995/03/17 06:40:18 andrew Exp
+ * $Id: irix5.h,v 1.12 2002/02/12 23:40:24 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -17,16 +17,28 @@
 #include <dlfcn.h>
 #include "utils/dynamic_loader.h"
 
-/* dynloader.c */
 /*
  * Dynamic Loader on SunOS 4.
  *
  * this dynamic loader uses the system dynamic loading interface for shared
  * libraries (ie. dlopen/dlsym/dlclose). The user must specify a shared
  * library as the file to be dynamically loaded.
- *
  */
-#define pg_dlopen(f)	dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+#define pg_dlopen(f)	dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define pg_dlsym		dlsym
 #define pg_dlclose		dlclose
 #define pg_dlerror		dlerror

src/backend/port/dynloader/linux.h

@@ -1,12 +1,13 @@
 /*-------------------------------------------------------------------------
  *
- * Dynamic loader interface for Linux
+ * linux.h
+ *		Port-specific prototypes for Linux
  *
  *
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: linux.h,v 1.16 2001/11/05 17:46:27 momjian Exp $
+ * $Id: linux.h,v 1.17 2002/02/12 23:40:29 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -35,7 +36,20 @@ do { \
 
 #else							/* HAVE_DLOPEN */
 
-#define pg_dlopen(f)	dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+#define pg_dlopen(f)	dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define pg_dlsym		dlsym
 #define pg_dlclose		dlclose
 #define pg_dlerror		dlerror

src/backend/port/dynloader/netbsd.h

@@ -1,13 +1,13 @@
 /*-------------------------------------------------------------------------
  *
- * port_protos.h
+ * netbsd.h
- *	  port-specific prototypes for NetBSD 1.0
+ *	  port-specific prototypes for NetBSD
  *
  *
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: netbsd.h,v 1.8 2001/11/05 17:46:27 momjian Exp $
+ * $Id: netbsd.h,v 1.9 2002/02/12 23:40:37 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -21,7 +21,6 @@
 
 #include "utils/dynamic_loader.h"
 
-/* dynloader.c */
 /*
  * Dynamic Loader on NetBSD 1.0.
  *
@@ -34,7 +33,21 @@
  * begin with an underscore is fairly tricky, and some versions of
  * NetBSD (like 1.0, and 1.0A pre June 1995) have no dlerror.)
  */
-#define		   pg_dlopen(f)    BSD44_derived_dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+#define		   pg_dlopen(f)    BSD44_derived_dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define		   pg_dlsym		   BSD44_derived_dlsym
 #define		   pg_dlclose	   BSD44_derived_dlclose
 #define		   pg_dlerror	   BSD44_derived_dlerror

src/backend/port/dynloader/openbsd.h

@@ -1,11 +1,12 @@
 /*-------------------------------------------------------------------------
  *
- * Dynamic loader for OpenBSD
+ * openbsd.h
+ *	  port-specific prototypes for OpenBSD
  *
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: openbsd.h,v 1.9 2001/11/05 17:46:27 momjian Exp $
+ * $Id: openbsd.h,v 1.10 2002/02/12 23:40:40 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -19,7 +20,6 @@
 
 #include "utils/dynamic_loader.h"
 
-/* dynloader.c */
 /*
  * Dynamic Loader on NetBSD 1.0.
  *
@@ -32,7 +32,21 @@
  * begin with an underscore is fairly tricky, and some versions of
  * NetBSD (like 1.0, and 1.0A pre June 1995) have no dlerror.)
  */
-#define		   pg_dlopen(f)    BSD44_derived_dlopen((f), RTLD_LAZY)
+
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+#define		   pg_dlopen(f)    BSD44_derived_dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define		   pg_dlsym		   BSD44_derived_dlsym
 #define		   pg_dlclose	   BSD44_derived_dlclose
 #define		   pg_dlerror	   BSD44_derived_dlerror

src/backend/port/dynloader/osf.h

@@ -1,13 +1,13 @@
 /*-------------------------------------------------------------------------
  *
- * alpha.h
+ * osf.h
  *	  prototypes for OSF/1-specific routines
  *
  *
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: osf.h,v 1.7 2001/11/15 16:08:15 petere Exp $
+ * $Id: osf.h,v 1.8 2002/02/12 23:40:43 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -18,23 +18,28 @@
 #include <dlfcn.h>
 #include "utils/dynamic_loader.h"
 
-/* dynloader.c */
-
 /*
  * Dynamic Loader on Alpha OSF/1.x
  *
  * this dynamic loader uses the system dynamic loading interface for shared
  * libraries (ie. dlopen/dlsym/dlclose). The user must specify a shared
  * library as the file to be dynamically loaded.
- *
  */
 
-/* RTLD_GLOBAL is not available in <5.x */
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
 #ifndef RTLD_GLOBAL
 #define RTLD_GLOBAL 0
 #endif
 
-#define  pg_dlopen(f)	dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+#define  pg_dlopen(f)	dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define  pg_dlsym(h, f) ((PGFunction) dlsym(h, f))
 #define  pg_dlclose(h)	dlclose(h)
 #define  pg_dlerror()	dlerror()

src/backend/port/dynloader/sco.h

@@ -1,13 +1,13 @@
 /*-------------------------------------------------------------------------
  *
- * port_protos.h
+ * sco.h
  *	  port-specific prototypes for SCO 3.2v5.2
  *
  *
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: sco.h,v 1.11 2001/11/05 17:46:27 momjian Exp $
+ * $Id: sco.h,v 1.12 2002/02/12 23:40:47 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -17,20 +17,30 @@
 #include <dlfcn.h>
 #include "utils/dynamic_loader.h"
 
-/* dynloader.c */
 /*
  * Dynamic Loader on SCO 3.2v5.0.2
  *
  * this dynamic loader uses the system dynamic loading interface for shared
  * libraries (ie. dlopen/dlsym/dlclose). The user must specify a shared
  * library as the file to be dynamically loaded.
- *
  */
-#define pg_dlopen(f)	dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+#define pg_dlopen(f)	dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define pg_dlsym		dlsym
 #define pg_dlclose		dlclose
 #define pg_dlerror		dlerror
 
-/* port.c */
-
 #endif   /* PORT_PROTOS_H */

src/backend/port/dynloader/solaris.h

@@ -1,14 +1,38 @@
-/* $Header: /cvsroot/pgsql/src/backend/port/dynloader/solaris.h,v 1.7 2001/11/05 17:46:27 momjian Exp $ */
+/*-------------------------------------------------------------------------
-
+ *
-#ifndef DYNLOADER_SOLARIS_H
+ * solaris.h
-#define DYNLOADER_SOLARIS_H
+ *	  port-specific prototypes for Solaris
+ *
+ *
+ * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: solaris.h,v 1.8 2002/02/12 23:40:53 tgl Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PORT_PROTOS_H
+#define PORT_PROTOS_H
 
 #include <dlfcn.h>
 #include "utils/dynamic_loader.h"
 
-#define pg_dlopen(f)	dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+#define pg_dlopen(f)	dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define pg_dlsym		dlsym
 #define pg_dlclose		dlclose
 #define pg_dlerror		dlerror
 
-#endif   /* DYNLOADER_SOLARIS_H */
+#endif   /* PORT_PROTOS_H */

src/backend/port/dynloader/sunos4.h

@@ -1,13 +1,13 @@
 /*-------------------------------------------------------------------------
  *
- * port_protos.h
+ * sunos4.h
  *	  port-specific prototypes for SunOS 4
  *
  *
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: sunos4.h,v 1.12 2001/12/05 02:03:59 ishii Exp $
+ * $Id: sunos4.h,v 1.13 2002/02/12 23:40:55 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -17,16 +17,28 @@
 #include <dlfcn.h>
 #include "utils/dynamic_loader.h"
 
-/* dynloader.c */
 /*
  * Dynamic Loader on SunOS 4.
  *
  * this dynamic loader uses the system dynamic loading interface for shared
  * libraries (ie. dlopen/dlsym/dlclose). The user must specify a shared
  * library as the file to be dynamically loaded.
- *
  */
-#define pg_dlopen(f)	dlopen((f),1)
+
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+#define pg_dlopen(f)	dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define pg_dlsym		dlsym
 #define pg_dlclose		dlclose
 #define pg_dlerror		dlerror

src/backend/port/dynloader/svr4.h

@@ -1,34 +1,46 @@
 /*-------------------------------------------------------------------------
  *
- * dynloader.h
+ * svr4.h
  *	  port-specific prototypes for Intel x86/Intel SVR4
  *
  *
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: svr4.h,v 1.11 2001/11/05 17:46:27 momjian Exp $
+ * $Id: svr4.h,v 1.12 2002/02/12 23:41:01 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
-#ifndef DYNLOADER_H
+#ifndef PORT_PROTOS_H
-#define DYNLOADER_H
+#define PORT_PROTOS_H
 
 #include <dlfcn.h>
 #include "utils/dynamic_loader.h"
 
-/* dynloader.h */
 /*
  * Dynamic Loader on Intel x86/Intel SVR4.
  *
  * this dynamic loader uses the system dynamic loading interface for shared
  * libraries (ie. dlopen/dlsym/dlclose). The user must specify a shared
  * library as the file to be dynamically loaded.
- *
  */
-#define pg_dlopen(f)	dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+#define pg_dlopen(f)	dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define pg_dlsym		dlsym
 #define pg_dlclose		dlclose
 #define pg_dlerror		dlerror
 
-#endif   /* DYNLOADER_H */
+#endif   /* PORT_PROTOS_H */

src/backend/port/dynloader/univel.h

@@ -17,16 +17,28 @@
 #include <dlfcn.h>
 #include "utils/dynamic_loader.h"
 
- /* dynloader.c */
 /*
  * Dynamic Loader on Intel x86/Intel SVR4.
  *
  * this dynamic loader uses the system dynamic loading interface for shared
  * libraries (ie. dlopen/dlsym/dlclose). The user must specify a shared
  * library as the file to be dynamically loaded.
- *
  */
-#define pg_dlopen(f)	dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+#define pg_dlopen(f)	dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define pg_dlsym		dlsym
 #define pg_dlclose		dlclose
 #define pg_dlerror		dlerror

src/backend/port/dynloader/unixware.h

@@ -17,16 +17,28 @@
 #include <dlfcn.h>
 #include "utils/dynamic_loader.h"
 
- /* dynloader.c */
 /*
  * Dynamic Loader on Intel x86/Intel SVR4.
  *
  * this dynamic loader uses the system dynamic loading interface for shared
  * libraries (ie. dlopen/dlsym/dlclose). The user must specify a shared
  * library as the file to be dynamically loaded.
- *
  */
-#define pg_dlopen(f)	dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+#define pg_dlopen(f)	dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define pg_dlsym		dlsym
 #define pg_dlclose		dlclose
 #define pg_dlerror		dlerror

src/backend/port/dynloader/win.h

@@ -17,16 +17,28 @@
 #include <dlfcn.h>
 #include "utils/dynamic_loader.h"
 
- /* dynloader.c */
 /*
  * Dynamic Loader on Intel x86/Windows NT
  *
  * this dynamic loader uses the system dynamic loading interface for shared
  * libraries (ie. dlopen/dlsym/dlclose). The user must specify a shared
  * library as the file to be dynamically loaded.
- *
  */
-#define pg_dlopen(f)		dlopen((f), RTLD_LAZY | RTLD_GLOBAL)
+
+/*
+ * In some older systems, the RTLD_NOW flag isn't defined and the mode
+ * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
+ * if available, but it doesn't exist everywhere.
+ * If it doesn't exist, set it to 0 so it has no effect.
+ */
+#ifndef RTLD_NOW
+#define RTLD_NOW 1
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+
+#define pg_dlopen(f)	dlopen((f), RTLD_NOW | RTLD_GLOBAL)
 #define pg_dlsym		dlsym
 #define pg_dlclose		dlclose
 #define pg_dlerror		dlerror