only use FindExInfoBasic on win7+

1 files changed, 13 insertions, 2 deletions

diff --git a/src/disk_interface.cc b/src/disk_interface.cc
index 50a2d97..fa0aa3d 100644
--- a/src/disk_interface.cc
+++ b/src/disk_interface.cc
@@ -82,12 +82,23 @@ TimeStamp StatSingleFile(const string& path, bool quiet) {
   return TimeStampFromFileTime(attrs.ftLastWriteTime);
 }
 
+bool IsWindows7OrLater() {
+  OSVERSIONINFO version_info = { sizeof(version_info) };
+  if (!GetVersionEx(&version_info))
+    Fatal("GetVersionEx: %s", GetLastErrorString().c_str());
+  return version_info.dwMajorVersion > 6 ||
+         version_info.dwMajorVersion == 6 && version_info.dwMinorVersion >= 1;
+}
+
 bool StatAllFilesInDir(const string& dir, map<string, TimeStamp>* stamps,
                        bool quiet) {
   // FindExInfoBasic is 30% faster than FindExInfoStandard.
+  static bool can_use_basic_info = IsWindows7OrLater();
+  FINDEX_INFO_LEVELS level =
+      can_use_basic_info ? FindExInfoBasic : FindExInfoStandard;
   WIN32_FIND_DATAA ffd;
-  HANDLE find_handle = FindFirstFileExA((dir + "\\*").c_str(), FindExInfoBasic,
-                                        &ffd, FindExSearchNameMatch, NULL, 0);
+  HANDLE find_handle = FindFirstFileExA((dir + "\\*").c_str(), level, &ffd,
+                                        FindExSearchNameMatch, NULL, 0);
 
   if (find_handle == INVALID_HANDLE_VALUE) {
     DWORD err = GetLastError();