Win32Fatal: support a "hint" for the error

The callsite might have extra context which is helpful for interpreting
the error message.

2 files changed, 7 insertions, 3 deletions

diff --git a/src/util.cc b/src/util.cc
index 760bc23..8e67fd9 100644
--- a/src/util.cc
+++ b/src/util.cc
@@ -432,8 +432,12 @@ string GetLastErrorString() {
   return msg;
 }
 
-void Win32Fatal(const char* function) {
-  Fatal("%s: %s", function, GetLastErrorString().c_str());
+void Win32Fatal(const char* function, const char* hint) {
+  if (hint) {
+    Fatal("%s: %s (%s)", function, GetLastErrorString().c_str(), hint);
+  } else {
+    Fatal("%s: %s", function, GetLastErrorString().c_str());
+  }
 }
 #endif
 
diff --git a/src/util.h b/src/util.h
index 1b4227c..6a4a7a9 100644
--- a/src/util.h
+++ b/src/util.h
@@ -119,7 +119,7 @@ bool Truncate(const string& path, size_t size, string* err);
 string GetLastErrorString();
 
 /// Calls Fatal() with a function name and GetLastErrorString.
-NORETURN void Win32Fatal(const char* function);
+NORETURN void Win32Fatal(const char* function, const char* hint = NULL);
 #endif
 
 #endif  // NINJA_UTIL_H_