Add another flag for enabling a bit bridge build

src/common/config/config.h.in

@@ -0,0 +1,30 @@
+// yabridge: a Wine VST bridge
+// Copyright (C) 2020  Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+/**
+ * The name of the wine host name, e.g. `yabridge-host.exe` for the regular 64
+ * bit build.
+ */
+constexpr char yabridge_wine_host_name[] = "@host_binary_64bit@";
+
+/**
+ * The name of the 32-bit wine host name, e.g. `yabridge-host-32.exe`.` This is
+ * used as a bitbridge to be able to load legacy 32-bit only Windows plugins
+ * from a 64-bit Linux host.
+ */
+constexpr char yabridge_wine_host_name_32bit[] = "@host_binary_32bit@";

src/common/config/meson.build

@@ -1,3 +1,16 @@
+# Contains constants determined while configuring the build. As an alternative
+# to preprocessor macros.
+config_header = configure_file(
+  input : 'config.h.in',
+  output : 'config.h',
+  configuration : configuration_data(
+    {
+      'host_binary_32bit': host_name_32bit + '.exe',
+      'host_binary_64bit': host_name_64bit + '.exe',
+    }
+  )
+)
+
 # Generate a file containing the last annotated git tag and possibly also the
 # amount of commits since then and the hash of the last commit
 version_header = vcs_tag(

src/plugin/host-bridge.cpp

@@ -30,6 +30,7 @@
 #endif
 
 // Generated inside of build directory
+#include <src/common/config/config.h>
 #include <src/common/config/version.h>
 
 #include "../common/communication.h"
@@ -40,11 +41,6 @@ namespace bp = boost::process;
 // boost::filesystem
 namespace fs = boost::filesystem;
 
-/**
- * The name of the wine VST host binary.
- */
-constexpr auto yabridge_wine_host_name = "yabridge-host.exe";
-
 /**
  * Used for generating random identifiers.
  */
@@ -500,6 +496,8 @@ fs::path find_wine_vst_host() {
         return host_path;
     }
 
+    // TODO: First, check whether the plugin is 32-bit or 64-bit, and then
+    //       search for the correct binary accordingly
     // Bosot will return an empty path if the file could not be found in the
     // search path
     const fs::path vst_host_path = bp::search_path(yabridge_wine_host_name);