[fetch] Don't attempt to download on unknown OSes
MODIFY
src/vcpkg/commands.fetch.cpp
src/vcpkg/commands.fetch.cpp
@@ -47,10 +47,13 @@ namespace vcpkg::Commands::Fetch
static constexpr StringLiteral OS_STRING = "windows";
#elif defined(__APPLE__)
static constexpr StringLiteral OS_STRING = "osx";
-#else // assume linux
+#elif defined(__linux__)
static constexpr StringLiteral OS_STRING = "linux";
+#else
+ return ToolData{};
#endif
+#if defined(_WIN32) || defined(__APPLE__) || defined(__linux__)
static const std::string XML_VERSION = "2";
static const fs::path XML_PATH = paths.scripts / "vcpkgTools.xml";
@@ -137,6 +140,7 @@ namespace vcpkg::Commands::Fetch
paths.downloads / archive_name.value_or(exe_relative_path),
tool_dir_path,
sha512};
+#endif
}
static bool exists_and_has_equal_or_greater_version(const std::string& version_cmd,

[fetch] Don't attempt to download on unknown OSes