dllhost: Add stub implementation.

configure

@@ -1556,6 +1556,7 @@ enable_conhost
 enable_control
 enable_cscript
 enable_dism
+enable_dllhost
 enable_dplaysvr
 enable_dpnsvr
 enable_dpvsetup
@@ -21984,6 +21985,7 @@ wine_fn_config_makefile programs/conhost/tests enable_tests
 wine_fn_config_makefile programs/control enable_control
 wine_fn_config_makefile programs/cscript enable_cscript
 wine_fn_config_makefile programs/dism enable_dism
+wine_fn_config_makefile programs/dllhost enable_dllhost
 wine_fn_config_makefile programs/dplaysvr enable_dplaysvr
 wine_fn_config_makefile programs/dpnsvr enable_dpnsvr
 wine_fn_config_makefile programs/dpvsetup enable_dpvsetup

configure.ac

@@ -3251,6 +3251,7 @@ WINE_CONFIG_MAKEFILE(programs/conhost/tests)
 WINE_CONFIG_MAKEFILE(programs/control)
 WINE_CONFIG_MAKEFILE(programs/cscript)
 WINE_CONFIG_MAKEFILE(programs/dism)
+WINE_CONFIG_MAKEFILE(programs/dllhost)
 WINE_CONFIG_MAKEFILE(programs/dplaysvr)
 WINE_CONFIG_MAKEFILE(programs/dpnsvr)
 WINE_CONFIG_MAKEFILE(programs/dpvsetup)

programs/dllhost/Makefile.in

+MODULE    = dllhost.exe
+IMPORTS   = ole32
+
+EXTRADLLFLAGS = -mwindows -municode
+
+C_SRCS = \
+	dllhost.c

programs/dllhost/dllhost.c

+/*
+ * Copyright 2022 Dmitry Timoshkov
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include <stdarg.h>
+
+#include <windef.h>
+#include <winbase.h>
+#include <objbase.h>
+
+#include "wine/debug.h"
+
+WINE_DEFAULT_DEBUG_CHANNEL(dllhost);
+
+int WINAPI wWinMain(HINSTANCE hinst, HINSTANCE previnst, LPWSTR cmdline, int showcmd)
+{
+    HRESULT hr;
+    CLSID clsid;
+
+    if (wcsnicmp(cmdline, L"/PROCESSID:", 11))
+        return 0;
+
+    cmdline += 11;
+
+    CoInitializeEx(NULL, COINIT_MULTITHREADED);
+
+    hr = CLSIDFromString(cmdline, &clsid);
+    if (hr == S_OK)
+    {
+        FIXME("hosting object %s is not implemented\n", wine_dbgstr_guid(&clsid));
+    }
+
+    CoUninitialize();
+
+    return 0;
+}