[test][ASan][Win] Print more info when LoadLibrary fails

Reviewed By: hans Differential Revision: https://reviews.llvm.org/D118206
llvm · Jan 26, 2022 · 092f6ae · 092f6ae
1 parent cbc623c
commit 092f6ae
Showing 1 changed file with 14 additions and 2 deletions.
diff --git a/compiler-rt/test/asan/TestCases/Windows/dll_host.cpp b/compiler-rt/test/asan/TestCases/Windows/dll_host.cpp
@@ -59,8 +59,20 @@ int main(int argc, char **argv) {
 
   HMODULE h = LoadLibrary(dll_name);
   if (!h) {
-    printf("Could not load DLL: %s (code: %lu)!\n",
-           dll_name, GetLastError());
+    DWORD err = GetLastError();
+    printf("Could not load DLL: %s (code: %lu)!\n", dll_name, err);
+
+    LPSTR buf;
+
+    FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
+                       FORMAT_MESSAGE_IGNORE_INSERTS,
+                   NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buf, 0,
+                   NULL);
+
+    printf("Error: %s\n", buf);
+
+    LocalFree(buf);
+
     return 102;
   }