fs/Features: add macro FS_CHARSET_ALWAYS_UTF8

src/fs/AllocatedPath.cxx

@@ -32,24 +32,24 @@ AllocatedPath::~AllocatedPath() noexcept = default;
 AllocatedPath
 AllocatedPath::FromUTF8(const char *path_utf8) noexcept
 {
-#if defined(HAVE_FS_CHARSET) || defined(_WIN32)
+#ifdef FS_CHARSET_ALWAYS_UTF8
+	return FromFS(path_utf8);
+#else
 	try {
 		return AllocatedPath(::PathFromUTF8(path_utf8));
 	} catch (...) {
 		return nullptr;
 	}
-#else
-	return FromFS(path_utf8);
 #endif
 }
 
 AllocatedPath
 AllocatedPath::FromUTF8Throw(const char *path_utf8)
 {
-#if defined(HAVE_FS_CHARSET) || defined(_WIN32)
-	return AllocatedPath(::PathFromUTF8(path_utf8));
-#else
+#ifdef FS_CHARSET_ALWAYS_UTF8
 	return FromFS(path_utf8);
+#else
+	return AllocatedPath(::PathFromUTF8(path_utf8));
 #endif
 }
 

src/fs/Features.hxx

@@ -26,4 +26,11 @@
 #define HAVE_FS_CHARSET
 #endif
 
+#if !defined(HAVE_FS_CHARSET) && !defined(_WIN32)
+/**
+ * Is the filesystem character set hard-coded to UTF-8?
+ */
+#define FS_CHARSET_ALWAYS_UTF8
+#endif
+
 #endif