NT updates from jon@symas.com.

0552b1c5 · Howard Chu · ff701c28 · 0552b1c5 · 0552b1c5 · 0552b1c5
Commit 0552b1c5 authored Dec 07, 2001 by Howard Chu
--- a/build/lib-shared.mk
+++ b/build/lib-shared.mk
@@ -7,44 +7,47 @@
 ## Makefile Template for Shared Libraries
 ##

-NT_LTFLAGS = --only-$(LINKAGE)
-LTFLAGS = $(@PLAT@_LTFLAGS) 
-
-NT_DYN_LT_NO_UNDEF = -no-undefined
-LT_NO_UNDEF = $(@PLAT@_@LIB_LINKAGE@_LT_NO_UNDEF)
-
-COMPILE = $(LIBTOOL) $(LTFLAGS) --mode=compile $(CC) $(CFLAGS) $(EXTRA_DEFS) -c
-LTLIBLINK = $(LIBTOOL) $(LTFLAGS) --mode=link $(CC) -rpath $(libdir) \
-	$(CFLAGS) $(LDFLAGS) $(LTVERSION) $(LT_NO_UNDEF)
-
 MKDEPFLAG = -l

 .SUFFIXES: .c .o .lo

 .c.lo:
-	$(COMPILE) $<
-
-
-# DYN_EXT (@DYN_EXT@) describes the extension assoicated with a
-# dynamic library, e.g. so, dll
-
-DYN_EXT=@DYN_EXT@
-
-$(LIBRARY):  version.lo
-	$(LTLIBLINK) -o $@ $(OBJS) version.lo $(EXTRA_LIBS)
-	$(RM) ../$@
-	d=`$(PWD)`; d=`$(BASENAME) $$d`; cd ..; $(LN_S) $$d/$@ $@; \
-	t=`$(BASENAME) $@ .la`.a; $(RM) $$t; $(LN_S) $$d/.libs/$$t $$t
-	if test "$(LINK_BINS_DYNAMIC)" = "yes"; then \
-		d=`$(PWD)`; d=`$(BASENAME) $$d`; b=`$(BASENAME) $@ .la`; \
-		 cd .libs; t=`echo $$b*.$(DYN_EXT)`; (cd ../.. ; $(RM) $$t; \
-		 $(LN_S) $$d/.libs/$$t $$t); \
-		if test "$(DYN_EXT)" != dll; then \
-		    t=`echo $$b.$(DYN_EXT).?`; cd ../.. ; \
-		    $(RM) $$t; \
-		    $(LN_S) $$d/.libs/$$t $$t; \
-		fi \
-	fi
+	$(LTCOMPILE_LIB) $<
+
+#
+# symlinks for libraries: UNIX and Windows (a.k.a. NT) need to be handled
+# differently. In UNIX, the static and shared libraries, as well as shared
+# library symlinks, can all be symlinked in the 'libraries' directory. In
+# Windows, only the static library (.a file) or the shared library (.dll)
+# file should be present. The current mingw linker (i.e. ld) WILL look
+# for a .dll file at link time and internally generate an import library
+# for it. However, ld will not do this if a static library is present.
+# That doesn't seem very correct, but that's the behavior, like it or not.
+#
+# Note that there doesn't seem to be a true need for the .la file at
+# this level, so it is left out.
+#
+# The set of symlinks are determined by examining the library's .la file.
+#
+$(LIBRARY): version.lo
+	$(LTLINK_LIB) -o $@ $(OBJS) version.lo $(LINK_LIBS)
+	@d=`$(PWD)`; b=`$(BASENAME) $$d`; \
+	echo cd ..; \
+	cd ..; \
+	arlib=`grep '^old_library=' $$b/$@`; \
+	arlib=`expr "$$arlib" : "[^']*'\(.*\)'"`; \
+	libs=$$arlib; \
+	if test "$(BUILD_LIBS_DYNAMIC)" = "shared"; then \
+		shlibs=`grep '^library_names' $$b/$@`; \
+		shlibs=`expr "$$shlibs" : "[^']*'\(.*\)'"`; \
+		libs="$$libs $$shlibs"; \
+	fi; \
+	for i in $$libs; do \
+		echo $(RM) $$i; \
+		$(RM) $$i; \
+		echo $(LN_S) $$b/.libs/$$i $$i; \
+		$(LN_S) $$b/.libs/$$i $$i; \
+	done

 Makefile: $(top_srcdir)/build/lib-shared.mk

--- a/build/lib.mk
+++ b/build/lib.mk
@@ -21,11 +21,17 @@ lint: lint-local FORCE
 lint5: lint5-local FORCE
 	$(5LINT) $(DEFS) $(DEFINES) $(SRCS)

+#
+# In the mingw/cygwin environment, the so and dll files must be
+# deleted separately, instead of using the {.so*,*.dll} construct
+# that was previously used. It just didn't work.
+#
 clean-common: 	FORCE
 	$(RM) $(LIBRARY) ../$(LIBRARY) $(XLIBRARY) \
 		$(PROGRAMS) $(XPROGRAMS) $(XSRCS) $(XXSRCS) \
 		*.o *.lo a.out *.exe core version.c .libs/* \
-		../`$(BASENAME) $(LIBRARY) .la`{.a,.so*,*.dll}
+		../`$(BASENAME) $(LIBRARY) .la`.so* \
+		../`$(BASENAME) $(LIBRARY) .la`*.dll

 depend-common: FORCE
 	$(MKDEP) $(DEFS) $(DEFINES) $(SRCS) $(XXSRCS)
@@ -34,3 +40,4 @@ lint-local: FORCE
 lint5-local: FORCE

 Makefile: $(top_srcdir)/build/lib.mk
+
--- a/build/mod.mk
+++ b/build/mod.mk
@@ -10,18 +10,12 @@
 LIBRARY = $(LIBBASE).la
 LIBSTAT = lib$(LIBBASE).a

-LTFLAGS = --only-$(LINKAGE)
-
-COMPILE = $(LIBTOOL) $(LTFLAGS) --mode=compile $(CC) $(CFLAGS) $(MODDEFS) -c
-LTLIBLINK = $(LIBTOOL) $(LTFLAGS) --mode=link $(CC) -rpath $(moduledir) \
-	$(CFLAGS) $(LDFLAGS) $(LTVERSION) $(LT_NO_UNDEF)
-
 MKDEPFLAG = -l

 .SUFFIXES: .c .o .lo

 .c.lo:
-	$(COMPILE) $<
+	$(LTCOMPILE_MOD) $<

 all-no lint-no 5lint-no depend-no install-no: FORCE
 	@echo "run configure with $(BUILD_OPT) to make $(LIBBASE)"
@@ -32,9 +26,8 @@ version.c: $(OBJS)
 	$(RM) $@
 	$(MKVERSION) $(LIBBASE) > $@

-$(LIBRARY): $(MODDEPS) version.lo
-	$(LTLIBLINK) -module -o $@ $(OBJS) version.lo \
-	    $(MODLIBS)
+$(LIBRARY): version.lo
+	$(LTLINK_MOD) -module -o $@ $(OBJS) version.lo $(LINK_LIBS)

 $(LIBSTAT): version.lo
 	$(AR) ruv $@ `echo $(OBJS) | sed 's/\.lo/.o/g'` version.o

--- a/build/openldap.m4
+++ b/build/openldap.m4
@@ -774,6 +774,7 @@ AC_DEFUN([OL_NT_THREADS], [

 	if test $ac_cv_func__beginthread = yes ; then
 		AC_DEFINE(HAVE_NT_THREADS,1,[if you have NT Threads])
+		ol_cv_nt_threads=yes
 	fi
 ])
 dnl ====================================================================

--- a/build/top.mk
+++ b/build/top.mk
@@ -37,9 +37,12 @@ sharedstatedir = @sharedstatedir@
 sysconfdir = @sysconfdir@$(ldap_subdir)
 schemadir = $(sysconfdir)/schema

+PLAT = @PLAT@
 EXEEXT = @EXEEXT@
 OBJEXT = @OBJEXT@

+BUILD_LIBS_DYNAMIC = @BUILD_LIBS_DYNAMIC@
+
 INSTALL = @INSTALL@
 INSTALL_PROGRAM = @INSTALL_PROGRAM@
 INSTALL_DATA = @INSTALL_DATA@
@@ -58,11 +61,47 @@ MKVERSION = $(top_srcdir)/build/mkversion -v "$(VERSION)"
 LIBTOOL = @LIBTOOL@
 LIBVERSION = @OPENLDAP_LIBVERSION@
 LTVERSION = -version-info $(LIBVERSION)
-#We don't use our own shared libraries (yet)
-#LTLINK  = $(LIBTOOL) --mode=link $(CC) -rpath $(libdir) \
-#	$(CFLAGS) $(LDFLAGS)
-LTLINK  = $(LIBTOOL) --mode=link $(CC) \
-	$(CFLAGS) $(LDFLAGS)
+
+# libtool --only flag for libraries: platform specific
+NT_LTONLY_LIB = --only-$(BUILD_LIBS_DYNAMIC)
+LTONLY_LIB = $(@PLAT@_LTONLY_LIB)
+
+# libtool --only flag for modules: depends on linkage of module
+# The BUILD_MOD_DYNAMIC macro is defined in each backend Makefile.in file
+LTONLY_MOD = --only-$(BUILD_MOD_DYNAMIC)
+
+# platform-specific libtool flags
+NT_LTFLAGS_LIB = -no-undefined -avoid-version -rpath $(libdir)
+NT_LTFLAGS_MOD = -no-undefined -avoid-version -rpath $(moduledir)
+UNIX_LTFLAGS_LIB = $(LTVERSION) -rpath $(libdir)
+UNIX_LTFLAGS_MOD = $(LTVERSION) -rpath $(moduledir)
+
+# libtool flags
+LTFLAGS     = $(@PLAT@_LTFLAGS)
+LTFLAGS_LIB = $(@PLAT@_LTFLAGS_LIB)
+LTFLAGS_MOD = $(@PLAT@_LTFLAGS_MOD)
+
+# LIB_DEFS defined in liblber and libldap Makefile.in files.
+# MOD_DEFS defined in backend Makefile.in files.
+
+# platform-specific LINK_LIBS defined in various Makefile.in files.
+# LINK_LIBS referenced in library and module link commands.
+LINK_LIBS = $(@PLAT@_LINK_LIBS)
+
+LTLINK   = $(LIBTOOL) --mode=link $(CC) $(CFLAGS) $(LDFLAGS) $(LTFLAGS)
+
+LTCOMPILE_LIB = $(LIBTOOL) $(LTONLY_LIB) --mode=compile \
+		    $(CC) $(CFLAGS) $(CPPFLAGS) $(LIB_DEFS) -c
+
+LTLINK_LIB = $(LIBTOOL) $(LTONLY_LIB) --mode=link \
+		    $(CC) $(CFLAGS) $(LDFLAGS) $(LTFLAGS_LIB)
+
+LTCOMPILE_MOD = $(LIBTOOL) $(LTONLY_MOD) --mode=compile \
+		    $(CC) $(CFLAGS) $(CPPFLAGS) $(MOD_DEFS) -c
+
+LTLINK_MOD = $(LIBTOOL) $(LTONLY_MOD) --mode=link \
+		    $(CC) $(CFLAGS) $(LDFLAGS) $(LTFLAGS_MOD)
+
 LTINSTALL = $(LIBTOOL) --mode=install $(INSTALL) 

 # Misc UNIX commands used in build environment
@@ -140,7 +179,6 @@ MODULES_LDFLAGS = @SLAPD_MODULES_LDFLAGS@
 MODULES_LIBS = @MODULES_LIBS@
 TERMCAP_LIBS = @TERMCAP_LIBS@
 SLAPD_PERL_LDFLAGS = @SLAPD_PERL_LDFLAGS@
-LINK_BINS_DYNAMIC = @LINK_BINS_DYNAMIC@

 SLAPD_SQL_LDFLAGS = @SLAPD_SQL_LDFLAGS@
 SLAPD_SQL_INCLUDES = @SLAPD_SQL_INCLUDES@
@@ -152,7 +190,8 @@ SLURPD_LIBS = @SLURPD_LIBS@
 # Our Defaults
 CC = $(AC_CC)
 DEFS = $(LDAP_INCPATH) $(XINCPATH) $(XDEFS) $(AC_DEFS) $(DEFINES)
-CFLAGS = $(AC_CFLAGS) $(DEFS)
+CFLAGS = $(AC_CFLAGS)
+CPPFLAGS = $(DEFS)
 LDFLAGS = $(LDAP_LIBPATH) $(AC_LDFLAGS) $(XLDFLAGS)
 LIBS = $(XLIBS) $(XXLIBS) $(AC_LIBS) $(XXXLIBS)


--- a/clients/Makefile.in
+++ b/clients/Makefile.in
@@ -4,4 +4,6 @@
 ##
 ## Clients Makefile.in for OpenLDAP

-SUBDIRS= tools ud
+SUBDIRS = tools ud
+CLEANDIRS = finger mail500 maildap
+
--- a/clients/tools/Makefile.in
+++ b/clients/tools/Makefile.in
@@ -8,9 +8,6 @@ OBJS	= ldapsearch.o ldapmodify.o ldapdelete.o ldapmodrdn.o ldappasswd.o
 LDAP_INCDIR= ../../include       
 LDAP_LIBDIR= ../../libraries

-NT_DYN_DEFS = -DLBER_DECL=dllimport -DLDAP_DECL=dllimport
-CPPFLAGS = $(@PLAT@_@LIB_LINKAGE@_DEFS)
-
 XLIBS =  -llutil -lldif -lldap -llber
 XXLIBS	= $(SECURITY_LIBS) $(LDIF_LIBS) $(LUTIL_LIBS)


--- a/clients/ud/Makefile.in
+++ b/clients/ud/Makefile.in
@@ -6,16 +6,15 @@ XSRCS= version.c
 OBJS=	main.o find.o mod.o print.o auth.o util.o help.o \
 	group.o globals.o edit.o
 HDRS=	ud.h
-PROGRAMS= ud
+
+UNIX_PRGS = ud
+PROGRAMS = $(@PLAT@_PRGS)

 LDAP_INCDIR= ../../include       
 LDAP_LIBDIR= ../../libraries

-NT_DYN_DEFS = -DLBER_DECL=dllimport -DLDAP_DECL=dllimport
-CPPFLAGS = $(@PLAT@_@LIB_LINKAGE@_DEFS)
-
 XLIBS =  -llutil -lldif -lldap -llber
-XXLIBS	= $(TERMCAP_LIBS) $(SECURITY_LIBS) $(LUTIL_LIBS)
+XXLIBS	= $(TERMCAP_LIBS) $(SECURITY_LIBS) $(LDIF_LIBS) $(LUTIL_LIBS)

 ud : version.o
 	$(LTLINK) -o $@ version.o $(OBJS) $(LIBS)

--- a/configure.in
+++ b/configure.in
@@ -788,6 +788,7 @@ AC_CHECK_HEADERS(	\
 	termios.h		\
 	unistd.h		\
 	winsock.h		\
+	winsock2.h		\
 )


@@ -799,24 +800,43 @@ AC_CHECK_FUNC(dlopen, :, [AC_CHECK_LIB(dl, dlopen)])
 dnl HP-UX requires -lV3
 AC_CHECK_LIB(V3, sigset)

-dnl Gotta check for winsock manually
-if test $ac_cv_header_winsock_h = yes; then
-	AC_CACHE_CHECK([for winsock], [ol_cv_winsock], 
-    	AC_TRY_LINK([#include <winsock.h>],[
-			socket(0,0,0);
-			select(0,NULL,NULL,NULL,NULL);
-			closesocket(0);
-			gethostname(NULL,0);
-    	],[ol_cv_winsock=yes],[ol_cv_winsock=no]))
-
-	if test $ol_cv_winsock = yes ; then
-		AC_DEFINE(HAVE_WINSOCK,1,[define if you have winsock])
+dnl The following is INTENTIONALLY scripted out because shell does not
+dnl support variable names with the '@' character, which is what
+dnl autoconf would try to generate if one merely used AC_SEARCH_LIBS
+AC_MSG_CHECKING(for winsock)
+save_LIBS="$LIBS"
+for curlib in ws2_32 wsock32; do
+	LIBS="$LIBS -l$curlib"
+	AC_TRY_LINK([
+			char socket@12();
+			char select@20();
+			char closesocket@4();
+			char gethostname@8();
+		    ],
+		    [
+			socket@12();
+			select@20();
+			closesocket@4();
+			gethostname@8();
+		    ],
+		    have_winsock=yes, have_winsock=no)
+
+	if test $have_winsock = yes; then
+		AC_DEFINE(HAVE_WINSOCK, 1, [define if you have winsock])
 		ac_cv_func_socket=yes
 		ac_cv_func_select=yes
 		ac_cv_func_closesocket=yes
 		ac_cv_func_gethostname=yes
+		if test $curlib = ws2_32; then
+			have_winsock=winsock2
+			AC_DEFINE(HAVE_WINSOCK2, 1,
+				  [define if you have winsock2])
+		fi
+		break
 	fi
-fi
+	LIBS="$save_LIBS"
+done
+AC_MSG_RESULT($have_winsock)

 dnl Find socket()
 dnl Likely combinations:
@@ -852,7 +872,8 @@ AC_CHECK_HEADERS( regex.h )
 if test "$ac_cv_header_regex_h" != yes ; then
 	AC_MSG_ERROR([POSIX regex.h required.])
 fi
-AC_CHECK_FUNC(regfree, :, AC_MSG_ERROR([POSIX regex required.]))
+AC_SEARCH_LIBS(regfree, [regex gnuregex],
+	       :, AC_MSG_ERROR([POSIX regex required.]))

 OL_POSIX_REGEX
 if test "$ol_cv_c_posix_regex" = no ; then
@@ -1898,9 +1919,10 @@ fi

 dnl ----------------------------------------------------------------
 if test $ol_enable_dynamic = yes -a $enable_shared = yes ; then
-	LINK_BINS_DYNAMIC="yes"
+	BUILD_LIBS_DYNAMIC=shared
+	AC_DEFINE(LDAP_LIBS_DYNAMIC, 1, [define if LDAP libs are dynamic])
 else
-	LINK_BINS_DYNAMIC="no"
+	BUILD_LIBS_DYNAMIC=static
 fi

 dnl ----------------------------------------------------------------
@@ -2074,7 +2096,7 @@ fi

 dnl ----------------------------------------------------------------
 dnl Check for entropy sources
-if test $cross_compiling != yes ; then
+if test $cross_compiling != yes -a $ac_cv_mingw32 != yes ; then
 	dev=no
 	if test -r /dev/urandom ; then
 		dev="/dev/urandom";
@@ -2559,28 +2581,22 @@ fi

 dnl ----------------------------------------------------------------

-if test "$LINK_BINS_DYNAMIC" = yes; then
-    LIB_LINKAGE=DYN
-    LT_LIB_LINKAGE=shared
-else
-    LIB_LINKAGE=STAT
-    LT_LIB_LINKAGE=static
-fi
+dnl
+dnl For Windows build, we don't want to include -dlopen flags.
+dnl They hurt more than they help.
+dnl

 if test "$ac_cv_mingw32" = yes ; then
    PLAT=NT
-    DYN_EXT=dll
+    SLAPD_MODULES_LDFLAGS=
+    SLAPD_MODULES_LIST=
 else
    PLAT=UNIX
-    DYN_EXT=so
 fi

 AC_SUBST(LIBSRCS)
-
 AC_SUBST(PLAT)
-AC_SUBST(LIB_LINKAGE)
-AC_SUBST(LT_LIB_LINKAGE)
-AC_SUBST(DYN_EXT)
+AC_SUBST(BUILD_LIBS_DYNAMIC)

 AC_SUBST(BUILD_SLAPD)
  AC_SUBST(BUILD_BDB)
@@ -2618,7 +2634,6 @@ AC_SUBST(LTHREAD_LIBS)
 AC_SUBST(LUTIL_LIBS)
 AC_SUBST(WRAP_LIBS)
 AC_SUBST(MOD_TCL_LIB)
-AC_SUBST(LINK_BINS_DYNAMIC)

 AC_SUBST(SLAPD_MODULES_CPPFLAGS)
 AC_SUBST(SLAPD_MODULES_LDFLAGS)

--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -31,16 +31,46 @@ ldap_config.h: $(LDAP_CONFIG) Makefile
 	@$(RM) $@
 	@echo "Making $@"
 	@echo "/* Generated from $(LDAP_CONFIG) on `date` */" > $@;  \
+	if test $(PLAT) = NT; then \
+	    sysconfdir=`cygpath -w $(sysconfdir) | \
+		$(SED) -e 's/\\\\/\\\\\\\\\\\\\\\\/g'`; \
+	    datadir=`cygpath -w $(datadir) | \
+		$(SED) -e 's/\\\\/\\\\\\\\\\\\\\\\/g'`; \
+	    bindir=`cygpath -w $(bindir) | \
+		$(SED) -e 's/\\\\/\\\\\\\\\\\\\\\\/g'`; \
+	    sbindir=`cygpath -w $(sbindir) | \
+		$(SED) -e 's/\\\\/\\\\\\\\\\\\\\\\/g'`; \
+	    libexecdir=`cygpath -w $(libexecdir) | \
+		$(SED) -e 's/\\\\/\\\\\\\\\\\\\\\\/g'`; \
+	    localstatedir=`cygpath -w $(localstatedir) | \
+		$(SED) -e 's/\\\\/\\\\\\\\\\\\\\\\/g'`; \
+	    editor=`cygpath -w $(EDITOR) | \
+		$(SED) -e 's/\\\\/\\\\\\\\\\\\\\\\/g'`; \
+	    finger=`cygpath -w $(FINGER) | \
+		$(SED) -e 's/\\\\/\\\\\\\\\\\\\\\\/g'`; \
+	    sendmail=`cygpath -w $(SENDMAIL) | \
+		$(SED) -e 's/\\\\/\\\\\\\\\\\\\\\\/g'`; \
+	else \
+	    sysconfdir=$(sysconfdir); \
+	    datadir=$(datadir); \
+	    bindir=$(bindir); \
+	    sbindir=$(sbindir); \
+	    libexecdir=$(libexecdir); \
+	    localstatedir=$(localstatedir); \
+	    editor=$(EDITOR); \
+	    finger=$(FINGER); \
+	    sendmail=$(SENDMAIL); \
+	fi; \
 	$(SED) \
-			-e 's;%SYSCONFDIR%;$(sysconfdir);' \
-			-e 's;%DATADIR%;$(datadir);' \
-			-e 's;%BINDIR%;$(bindir);' \
-			-e 's;%SBINDIR%;$(sbindir);' \
-			-e 's;%LIBEXECDIR%;$(libexecdir);' \
-			-e 's;%RUNDIR%;$(localstatedir);' \
-			-e 's;%EDITOR%;$(EDITOR);' \
-			-e 's;%FINGER%;$(FINGER);' \
-			-e 's;%SENDMAIL%;$(SENDMAIL);' \
+			-e "s;%SYSCONFDIR%;$$sysconfdir;" \
+			-e "s;%DATADIR%;$$datadir;" \
+			-e "s;%BINDIR%;$$bindir;" \
+			-e "s;%SBINDIR%;$$sbindir;" \
+			-e "s;%LIBEXECDIR%;$$libexecdir;" \
+			-e "s;%RUNDIR%;$$localstatedir;" \
+			-e "s;%EDITOR%;$$editor;" \
+			-e "s;%FINGER%;$$finger;" \
+			-e "s;%SENDMAIL%;$$sendmail;" \
 			 $(LDAP_CONFIG) >> $@; \
 	$(CHMOD) 444 $@

@@ -49,3 +79,4 @@ install-common:		all-common install-local
 clean-common:		clean-local
 veryclean-common:	veryclean-local
 depend-common:		depend-local
+
--- a/include/ac/string.h
+++ b/include/ac/string.h
@@ -51,8 +51,9 @@ LDAP_F(char *) ldap_pvt_strtok LDAP_P(( char *str,
 	/* strdup() is missing, declare our own version */
 #	undef strdup
 #	define strdup(s) ber_strdup(s)
-#else
+#elif !defined(_WIN32)
 	/* some systems fail to declare strdup */
+	/* Windows does not require this declaration */
 	LDAP_LIBC_F(char *) (strdup)();
 #endif


--- a/include/lber.h
+++ b/include/lber.h
@@ -498,12 +498,12 @@ ber_sockbuf_ctrl LDAP_P((
 	int opt,
 	void *arg ));

-LBER_F( Sockbuf_IO ) ber_sockbuf_io_tcp;
-LBER_F( Sockbuf_IO ) ber_sockbuf_io_readahead;
-LBER_F( Sockbuf_IO ) ber_sockbuf_io_fd;
-LBER_F( Sockbuf_IO ) ber_sockbuf_io_debug;
+LBER_V( Sockbuf_IO ) ber_sockbuf_io_tcp;
+LBER_V( Sockbuf_IO ) ber_sockbuf_io_readahead;
+LBER_V( Sockbuf_IO ) ber_sockbuf_io_fd;
+LBER_V( Sockbuf_IO ) ber_sockbuf_io_debug;
 #ifdef LDAP_CONNECTIONLESS
-LBER_F( Sockbuf_IO ) ber_sockbuf_io_udp;
+LBER_V( Sockbuf_IO ) ber_sockbuf_io_udp;
 #endif

 /*

--- a/include/lber_pvt.h
+++ b/include/lber_pvt.h
@@ -31,7 +31,7 @@ typedef struct sockbuf_buf {
 /*
 * bprint.c
 */
-LBER_F( BER_LOG_PRINT_FN ) ber_pvt_log_print;
+LBER_V( BER_LOG_PRINT_FN ) ber_pvt_log_print;

 LBER_F( int )
 ber_pvt_log_printf LDAP_P((

--- a/include/ldap_cdefs.h
+++ b/include/ldap_cdefs.h
@@ -55,93 +55,182 @@
 #	define LDAP_GCCATTR(attrs)
 #endif

-
-/* Support for NT dynamic libraries. */
+/*
+ * Support for Windows DLLs.
+ *
+ * When external source code includes header files for dynamic libraries,
+ * the external source code is "importing" DLL symbols into its resulting
+ * object code. On Windows, symbols imported from DLLs must be explicitly
+ * indicated in header files with the __declspec(dllimport) directive.
+ * This is not totally necessary for functions because the compiler
+ * (gcc or MSVC) will generate stubs when this directive is absent.
+ * However, this is required for imported variables.
+ *
+ * The LDAP libraries, i.e. liblber and libldap, can be built as
+ * static or shared, based on configuration. Just about all other source
+ * code in OpenLDAP use these libraries. If the LDAP libraries
+ * are configured as shared, 'configure' defines the LDAP_LIBS_DYNAMIC
+ * macro. When other source files include LDAP library headers, the
+ * LDAP library symbols will automatically be marked as imported. When
+ * the actual LDAP libraries are being built, the symbols will not
+ * be marked as imported because the LBER_LIBRARY or LDAP_LIBRARY macros
+ * will be respectively defined.
+ *
+ * Any project outside of OpenLDAP with source code wanting to use
+ * LDAP dynamic libraries should explicitly define LDAP_LIBS_DYNAMIC.
+ * This will ensure that external source code appropriately marks symbols
+ * that will be imported.
+ *
+ * The slapd executable, itself, can be used as a dynamic library.
+ * For example, if a backend module is compiled as shared, it will
+ * import symbols from slapd. When this happens, the slapd symbols
+ * must be marked as imported in header files that the backend module
+ * includes. Remember that slapd links with various static libraries.
+ * If the LDAP libraries were configured as static, their object
+ * code is also part of the monolithic slapd executable. Thus, when
+ * a backend module imports symbols from slapd, it imports symbols from
+ * all of the static libraries in slapd as well. Thus, the SLAP_IMPORT
+ * macro, when defined, will appropriately mark symbols as imported.
+ * This macro should be used by shared backend modules as well as any
+ * other external source code that imports symbols from the slapd
+ * executable as if it were a DLL.
+ *
+ * Note that we don't actually have to worry about using the
+ * __declspec(dllexport) directive anywhere. This is because both
+ * MSVC and Mingw provide alternate (more effective) methods for exporting
+ * symbols out of binaries, i.e. the use of a DEF file.
+ *
+ * NOTE ABOUT BACKENDS: Backends can be configured as static or dynamic.
+ * When a backend is configured as dynamic, slapd will load the backend
+ * explicitly and populate function pointer structures by calling
+ * the backend's well-known initialization function. Because of this
+ * procedure, slapd never implicitly imports symbols from dynamic backends.
+ * This makes it unnecessary to tag various backend functions with the
+ * __declspec(dllimport) directive. This is because neither slapd nor
+ * any other external binary should ever be implicitly loading a backend
+ * dynamic module.
+ *
+ * Backends are supposed to be self-contained. However, it appears that
+ * back-meta DOES implicitly import symbols from back-ldap. This means
+ * that the __declspec(dllimport) directive should be marked on back-ldap
+ * functions (in its header files) if and only if we're compiling for
+ * windows AND back-ldap has been configured as dynamic AND back-meta
+ * is the client of back-ldap. When client is slapd, there is no effect
+ * since slapd does not implicitly import symbols.
+ *
+ * TODO(?): Currently, back-meta nor back-ldap is supported for Mingw32.
+ * Thus, there's no need to worry about this right now. This is something that
+ * may or may not have to be addressed in the future.
+ */

 /* LBER library */
-#if defined(LBER_DECL) && defined(_WIN32)
-#	define LBER_F(type)		extern __declspec(LBER_DECL) type
-#	define LBER_V(type)		extern __declspec(LBER_DECL) type
+#if defined(_WIN32) && \
+    ((defined(LDAP_LIBS_DYNAMIC) && !defined(LBER_LIBRARY)) || \
+     (!defined(LDAP_LIBS_DYNAMIC) && defined(SLAPD_IMPORT)))
+#	define LBER_F(type)		extern __declspec(dllimport) type
+#	define LBER_V(type)		extern __declspec(dllimport) type
 #else
 #	define LBER_F(type)		extern type
 #	define LBER_V(type)		extern type
 #endif

 /* LDAP library */
-#if defined(LDAP_DECL) && defined(_WIN32)
-#	define LDAP_F(type)		extern __declspec(LDAP_DECL) type
-#	define LDAP_V(type)		extern __declspec(LDAP_DECL) type
+#if defined(_WIN32) && \
+    ((defined(LDAP_LIBS_DYNAMIC) && !defined(LDAP_LIBRARY)) || \
+     (!defined(LDAP_LIBS_DYNAMIC) && defined(SLAPD_IMPORT)))
+#	define LDAP_F(type)		extern __declspec(dllimport) type
+#	define LDAP_V(type)		extern __declspec(dllimport) type
 #else
 #	define LDAP_F(type)		extern type
 #	define LDAP_V(type)		extern type
 #endif

-/*
- * C library. Mingw32 links with the C run-time library by default,
- * so the explicit definition of CSTATIC will keep dllimport from
- * being defined.
- */
-#if (defined(__MINGW32__) && !defined(CSTATIC) || \
-     defined(_WIN32) && defined(_DLL))
-#	define LDAP_LIBC_F(type)	extern __declspec(dllimport) type
-#	define LDAP_LIBC_V(type)	extern __declspec(dllimport) type
-#else
-#	define LDAP_LIBC_F(type)	extern type
-#	define LDAP_LIBC_V(type)	extern type
-#endif
-
 /* AVL library */
-#if defined(LDAP_AVL_DECL) && defined(_WIN32)
-#	define LDAP_AVL_F(type)	extern __declspec(LDAP_AVL_DECL) type
-#	define LDAP_AVL_V(type)	extern __declspec(LDAP_AVL_DECL) type
+#if defined(_WIN32) && defined(SLAPD_IMPORT)
+#	define LDAP_AVL_F(type)		extern __declspec(dllimport) type
+#	define LDAP_AVL_V(type)		extern __declspec(dllimport) type
 #else
-#	define LDAP_AVL_F(type)	extern type
-#	define LDAP_AVL_V(type)	extern type
+#	define LDAP_AVL_F(type)		extern type