Remove obsolete linux dynloader code

This has been obsolete probably since the late 1990s.

Author: petere

configure

@@ -12495,7 +12495,7 @@ $as_echo "#define HAVE_STDBOOL_H 1" >>confdefs.h
 fi
 
 
-for ac_header in atomic.h crypt.h dld.h fp_class.h getopt.h ieeefp.h ifaddrs.h langinfo.h mbarrier.h poll.h sys/epoll.h sys/ipc.h sys/prctl.h sys/procctl.h sys/pstat.h sys/resource.h sys/select.h sys/sem.h sys/shm.h sys/sockio.h sys/tas.h sys/un.h termios.h ucred.h utime.h wchar.h wctype.h
+for ac_header in atomic.h crypt.h fp_class.h getopt.h ieeefp.h ifaddrs.h langinfo.h mbarrier.h poll.h sys/epoll.h sys/ipc.h sys/prctl.h sys/procctl.h sys/pstat.h sys/resource.h sys/select.h sys/sem.h sys/shm.h sys/sockio.h sys/tas.h sys/un.h termios.h ucred.h utime.h wchar.h wctype.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"

configure.in

@@ -1260,7 +1260,7 @@ AC_SUBST(UUID_LIBS)
 
 AC_HEADER_STDBOOL
 
-AC_CHECK_HEADERS([atomic.h crypt.h dld.h fp_class.h getopt.h ieeefp.h ifaddrs.h langinfo.h mbarrier.h poll.h sys/epoll.h sys/ipc.h sys/prctl.h sys/procctl.h sys/pstat.h sys/resource.h sys/select.h sys/sem.h sys/shm.h sys/sockio.h sys/tas.h sys/un.h termios.h ucred.h utime.h wchar.h wctype.h])
+AC_CHECK_HEADERS([atomic.h crypt.h fp_class.h getopt.h ieeefp.h ifaddrs.h langinfo.h mbarrier.h poll.h sys/epoll.h sys/ipc.h sys/prctl.h sys/procctl.h sys/pstat.h sys/resource.h sys/select.h sys/sem.h sys/shm.h sys/sockio.h sys/tas.h sys/un.h termios.h ucred.h utime.h wchar.h wctype.h])
 
 # On BSD, test for net/if.h will fail unless sys/socket.h
 # is included first.

src/backend/port/dynloader/linux.c

@@ -1,133 +1,7 @@
-/*-------------------------------------------------------------------------
+/*
+ * src/backend/port/dynloader/linux.c
  *
- * linux.c
- *	  Dynamic Loader for Postgres for Linux, generated from those for
- *	  Ultrix.
+ * Dummy file used for nothing at this point
  *
- *	  You need to install the dld library on your Linux system!
- *
- * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- *	  src/backend/port/dynloader/linux.c
- *
- *-------------------------------------------------------------------------
+ * see linux.h
  */
-
-#include "postgres.h"
-
-#ifdef HAVE_DLD_H
-#include <dld.h>
-#endif
-
-#include "dynloader.h"
-#include "miscadmin.h"
-
-
-#ifndef HAVE_DLOPEN
-
-void *
-pg_dlopen(const char *filename)
-{
-#ifndef HAVE_DLD_H
-	elog(ERROR, "dynamic load not supported");
-	return NULL;
-#else
-	static int	dl_initialized = 0;
-
-	/*
-	 * initializes the dynamic loader with the executable's pathname. (only
-	 * needs to do this the first time pg_dlopen is called.)
-	 */
-	if (!dl_initialized)
-	{
-		if (dld_init(dld_find_executable(my_exec_path)))
-			return NULL;
-
-		/*
-		 * if there are undefined symbols, we want dl to search from the
-		 * following libraries also.
-		 */
-		dl_initialized = 1;
-	}
-
-	/*
-	 * link the file, then check for undefined symbols!
-	 */
-	if (dld_link(filename))
-		return NULL;
-
-	/*
-	 * If undefined symbols: try to link with the C and math libraries! This
-	 * could be smarter, if the dynamic linker was able to handle shared libs!
-	 */
-	if (dld_undefined_sym_count > 0)
-	{
-		if (dld_link("/usr/lib/libc.a"))
-		{
-			elog(WARNING, "could not link C library");
-			return NULL;
-		}
-		if (dld_undefined_sym_count > 0)
-		{
-			if (dld_link("/usr/lib/libm.a"))
-			{
-				elog(WARNING, "could not link math library");
-				return NULL;
-			}
-			if (dld_undefined_sym_count > 0)
-			{
-				int			count = dld_undefined_sym_count;
-				char	  **list = dld_list_undefined_sym();
-
-				/* list the undefined symbols, if any */
-				do
-				{
-					elog(WARNING, "\"%s\" is undefined", *list);
-					list++;
-					count--;
-				} while (count > 0);
-
-				dld_unlink_by_file(filename, 1);
-				return NULL;
-			}
-		}
-	}
-
-	return (void *) strdup(filename);
-#endif
-}
-
-PGFunction
-pg_dlsym(void *handle, const char *funcname)
-{
-#ifndef HAVE_DLD_H
-	return NULL;
-#else
-	return (PGFunction) dld_get_func((funcname));
-#endif
-}
-
-void
-pg_dlclose(void *handle)
-{
-#ifndef HAVE_DLD_H
-#else
-	dld_unlink_by_file(handle, 1);
-	free(handle);
-#endif
-}
-
-char *
-pg_dlerror(void)
-{
-#ifndef HAVE_DLD_H
-	return "dynaloader unsupported";
-#else
-	return dld_strerror(dld_errno);
-#endif
-}
-
-#endif							/* !HAVE_DLOPEN */

src/backend/port/dynloader/linux.h

@@ -15,12 +15,7 @@
 #define PORT_PROTOS_H
 
 #include "utils/dynamic_loader.h"	/* pgrminclude ignore */
-#ifdef HAVE_DLOPEN
 #include <dlfcn.h>
-#endif
-
-
-#ifdef HAVE_DLOPEN
 
 /*
  * In some older systems, the RTLD_NOW flag isn't defined and the mode
@@ -39,6 +34,5 @@
 #define pg_dlsym		dlsym
 #define pg_dlclose		dlclose
 #define pg_dlerror		dlerror
-#endif							/* HAVE_DLOPEN */
 
 #endif							/* PORT_PROTOS_H */

src/include/pg_config.h.in

@@ -186,9 +186,6 @@
    don't. */
 #undef HAVE_DECL_VSNPRINTF
 
-/* Define to 1 if you have the <dld.h> header file. */
-#undef HAVE_DLD_H
-
 /* Define to 1 if you have the `dlopen' function. */
 #undef HAVE_DLOPEN
 

src/include/pg_config.h.win32

@@ -143,9 +143,6 @@
    don't. */
 #define HAVE_DECL_VSNPRINTF 1
 
-/* Define to 1 if you have the <dld.h> header file. */
-/* #undef HAVE_DLD_H */
-
 /* Define to 1 if you have the `dlopen' function. */
 /* #undef HAVE_DLOPEN */