Free cache memory once it's no longer used.

Doesn't slow down empty build times measurably, and
saves some memory on non-empty builds.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/disk_interface.cc b/src/disk_interface.cc
index cd99915..ff86ed1 100644
--- a/src/disk_interface.cc
+++ b/src/disk_interface.cc
@@ -230,3 +230,19 @@ int RealDiskInterface::RemoveFile(const string& path) {
     return 0;
   }
 }
+
+void RealDiskInterface::AllowCache(bool allow) {
+#ifdef _WIN32
+  use_cache_ = allow;
+  if (!use_cache_)
+    ClearCache();
+#endif
+}
+
+void RealDiskInterface::ClearCache() {
+#ifdef _WIN32
+  for (Cache::iterator it = cache_.begin(), end = cache_.end(); it != end; ++it)
+    delete it->second;
+  cache_.clear();
+#endif
+}