Build libasn1 as a DLL

In addition to building libasn1 as a DLL also add a build target
so that a list of exports can be generated and used to check with
the .def file whether any exports are being left out.

cf/w32-list-externs-from-objs.pl

@@ -0,0 +1,77 @@
+my $show_module_name = 1;
+my $use_indent = 1;
+my $strip_leading_underscore = 0;
+
+# Dump all symbols for the given object file that are defined and have
+# external scope.
+
+sub dump_symbols_for_file($)
+{
+    $fn = shift;
+
+    print STDERR "Opening dump of object [$fn]\n";
+
+    open(SP, '-|', "dumpbin /symbols \"".$fn."\"") or die "Can't open pipe for $fn";
+
+  LINE:
+    while (<SP>) {
+	# 008 00000000 SECT3  notype ()    External     | _encode_AccessDescription
+
+	/^[[:xdigit:]]{3,}\s[[:xdigit:]]{8,}\s(\w+)\s+\w*\s+\(\)\s+(\w+)\s+\|\s+(\w+)$/ && do {
+	    my ($section, $visibility, $symbol) = ($1, $2, $3);
+
+	    if ($section ne "UNDEF" && $visibility eq "External") {
+		print $fn if $show_module_name;
+		print "\t" if $use_indent || $show_module_name;
+
+		if ($strip_leading_underscore && $symbol =~ /_(.*)/) {
+		    $symbol = $1;
+		}
+		print $symbol;
+		print "\n";
+	    }
+	};
+    }
+
+    close SP;
+}
+
+sub use_response_file($)
+{
+    $fn = shift;
+
+    open (RF, '<', $fn) or die "Can't open response file $fn";
+
+    while (<RF>) {
+	/(\S+)/ && do {
+	    dump_symbols_for_file($1);
+	}
+    }
+    close RF;
+}
+
+for (@ARGV) {
+    ARG: {
+	/-q/ && do {
+	    $show_module_name = 0;
+	    last ARG;
+	};
+
+	/-1/ && do {
+	    $use_indent = 0;
+	    last ARG;
+	};
+
+	/-u/ && do {
+	    $strip_leading_underscore = 1;
+	    last ARG;
+	};
+
+	/@(.*)/ && do {
+	    use_response_file($1);
+	    last ARG;
+	};
+
+	dump_symbols_for_file($_);
+    }
+}

lib/asn1/NTMakefile

@@ -470,7 +470,7 @@ gen_files_kx509 =					    \
 	$(OBJ)\asn1_Kx509Response.x			    \
 	$(OBJ)\asn1_Kx509Request.x
 
-asn1_binaries =						    \
+ASN1_BINARIES =						    \
 	$(BINDIR)\asn1_compile.exe			    \
 	$(BINDIR)\asn1_print.exe			    \
 	$(BINDIR)\asn1_gen.exe
@@ -517,7 +517,7 @@ $(BINDIR)\asn1_gen.exe: $(OBJ)\asn1_gen.obj $(LIBASN1)
 	$(_VC_MANIFEST_CLEAN)
 	$(_CODESIGN)
 
-$(LIBASN1):				\
+LIBASN1_OBJS=	\
 	$(OBJ)\der.obj			\
 	$(OBJ)\der_get.obj		\
 	$(OBJ)\der_put.obj		\
@@ -538,13 +538,35 @@ $(LIBASN1):				\
 	$(gen_files_digest:.x=.obj)	\
 	$(gen_files_kx509:.x=.obj)	\
 	$(OBJ)\asn1_err.obj
-	$(LIBCON_C) /OUT:$@ @<<
+
+LIBASN1_LIBS=\
+	$(LIBROKEN)	\
+	$(LIBCOMERR)
+
+$(LIBASN1): $(BINDIR)\libasn1.dll
+
+$(BINDIR)\libasn1.dll: $(LIBASN1_OBJS)
+	$(DLLGUILINK_C) /OUT:$@ /DEF:libasn1-exports.def /IMPLIB:$(LIBASN1) $(LIBASN1_LIBS) @<<
 $(**: =
 )
 <<
+	$(DLLPREP)
 
 clean::
 	-$(RM) $(LIBASN1)
+	-$(RM) $(BINDIR)\libasn1.dll
+
+#
+# Generate list of exports
+#
+# This target is only used during development to generate a list of
+# symbols that are exported from all the object files in LIBASN1_OBJS.
+#
+exports-list.txt: $(LIBASN1_OBJS)
+	$(PERL) ..\..\cf\w32-list-externs-from-objs.pl -q -u @<< > $@
+$(**: =
+)
+<<
 
 $(gen_files_k5:.x=.c)	    : $$(@R).x
 
@@ -681,7 +703,7 @@ $(OBJ)\der-protos.h: $(libasn1_SOURCES:der-protos.h=)
 clean::
 	-$(RM) $(INCDIR)\der-protos.h
 
-all:: $(INCFILES) $(GENINCFILES) $(LIBASN1) $(asn1_binaries)
+all:: $(INCFILES) $(ASN1_BINARIES) $(GENINCFILES) $(LIBASN1)
 
 TEST_BINARIES=\
 	$(OBJ)\check-der.exe	\