Patch Win32 module loading to use Boost.Filesystem

C++17's `<filesystem>` header still doesn't seem to work with winegcc.

meson.build

@@ -125,9 +125,6 @@ tomlplusplus_dep = subproject('tomlplusplus', version : '2.1.0').get_variable('t
 wine_threads_dep = declare_dependency(link_args : '-lpthread')
 xcb_dep = dependency('xcb')
 
-# These are required for the VST3 SDK's module import system
-# TODO: Statically link this on the ubuntu-18.04 build
-native_filesystem_dep = declare_dependency(link_args : '-lstdc++fs')
 wine_ole32_dep = declare_dependency(link_args : '-lole32')
 # The SDK includes a comment pragma that would link to this on MSVC
 wine_shell32_dep = declare_dependency(link_args : '-lshell32')
@@ -322,7 +319,6 @@ host_64bit_deps = [
 ]
 if with_vst3
   host_64bit_deps += [
-    native_filesystem_dep,
     vst3_sdk_hosting_wine_64bit_dep,
     wine_ole32_dep,
     wine_shell32_dep,
@@ -369,7 +365,6 @@ if with_bitbridge
   ]
   if with_vst3
     host_32bit_deps += [
-      native_filesystem_dep,
       vst3_sdk_hosting_wine_32bit_dep,
       wine_ole32_dep,
       wine_shell32_dep,

src/wine-host/bridges/vst3.cpp

@@ -16,6 +16,8 @@
 
 #include "vst3.h"
 
+#include "../boost-fix.h"
+
 // TODO: Do something with this, I just wanted to get the build working
 // TODO: Check if this can load both regular Unix style paths with Wine. Oh and
 //       check if it works at all.

tools/patch-vst3-sdk.sh

@@ -63,6 +63,13 @@ replace_char16 "using Converter = std::wstring_convert<std::codecvt_utf8_utf16<c
 # version here is trying to do something funky
 sed -i 's/\b__MINGW32__\b/__NOPE__/g' "$sdk_directory/pluginterfaces/base/funknown.cpp"
 
+# libstdc++fs doesn't work under Winelib, for whatever reason that might be.
+# We'll patch the Win32 module loading to use Boost.Filesystem instead.
+sed -i 's/^#include <\(experimental\/\)\?filesystem>$/#include <boost\/filesystem.hpp>/' "$sdk_directory/public.sdk/source/vst/hosting/module_win32.cpp"
+sed -i 's/^using namespace std\(::experimental\)\?;$/namespace filesystem = boost::filesystem;/' "$sdk_directory/public.sdk/source/vst/hosting/module_win32.cpp"
+sed -i 's/\bfile_type::directory\b/file_type::directory_file/g' "$sdk_directory/public.sdk/source/vst/hosting/module_win32.cpp"
+sed -i 's/\bp\.native ()/p.wstring ()/g' "$sdk_directory/public.sdk/source/vst/hosting/module_win32.cpp"
+
 # Don't try adding `std::u8string` to an `std::vector<std::string>`. MSVC
 # probably coerces them, but GCC doesn't
 sed -i 's/\bgeneric_u8string\b/generic_string/g' "$sdk_directory/public.sdk/source/vst/hosting/module_win32.cpp"