Attempt to fix the MSVC9 failure with c-indext-test, where the CIndex DLL

and the c-index-test executable end up getting different copies	of
stderr, causing	non-deterministic ordering of output. Fixed by
flushing the file after printing a diagnostic (only on Windows).

llvm-svn: 96754

clang/test/Index/cindex-on-invalid.m

@@ -1,6 +1,5 @@
 // RUN: not c-index-test -test-load-source local %s > %t 2> %t.err
 // RUN: FileCheck %s < %t.err
-// XFAIL: win32
 // CHECK: error: expected identifier or '('
 // CHECK: Unable to load translation unit!
 

clang/tools/CIndex/CIndexDiagnostic.cpp

@@ -116,6 +116,13 @@ void clang_displayDiagnostic(CXDiagnostic Diagnostic, FILE *Out,
   else
     fprintf(Out, "<no diagnostic text>\n");
   clang_disposeString(Text);
+
+#ifdef LLVM_ON_WIN32
+  // On Windows, force a flush, since there may be multiple copies of
+  // stderr and stdout in the file system, all with different buffers
+  // but writing to the same device.
+  fflush(Out);
+#endif
 }
 
 unsigned clang_defaultDiagnosticDisplayOptions() {