[libcxx] r337946 - [windows] Fix warning about comparing ints of different signs

[Martin Storsjo via cfe-commits]

Author: mstorsjo
Date: Wed Jul 25 11:24:23 2018
New Revision: 337946

URL: http://llvm.org/viewvc/llvm-project?rev=337946&view=rev
Log:
[windows] Fix warning about comparing ints of different signs

This fixes a warning like this:

warning: comparison of integers of different signs:
      'std::__1::__libcpp_tls_key' (aka 'long') and 'DWORD'
      (aka 'unsigned long') [-Wsign-compare]
  if (*__key == FLS_OUT_OF_INDEXES)
      ~~~~~~ ^  ~~~~~~~~~~~~~~~~~~

Differential Revision: https://reviews.llvm.org/D49782

Modified:
    libcxx/trunk/src/support/win32/thread_win32.cpp

Modified: libcxx/trunk/src/support/win32/thread_win32.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/src/support/win32/thread_win32.cpp?rev=337946&r1=337945&r2=337946&view=diff
==============================================================================
--- libcxx/trunk/src/support/win32/thread_win32.cpp (original)
+++ libcxx/trunk/src/support/win32/thread_win32.cpp Wed Jul 25 11:24:23 2018
@@ -254,9 +254,10 @@ void __libcpp_thread_sleep_for(const chr
 int __libcpp_tls_create(__libcpp_tls_key* __key,
                         void(_LIBCPP_TLS_DESTRUCTOR_CC* __at_exit)(void*))
 {
-  *__key = FlsAlloc(__at_exit);
-  if (*__key == FLS_OUT_OF_INDEXES)
+  DWORD index = FlsAlloc(__at_exit);
+  if (index == FLS_OUT_OF_INDEXES)
     return GetLastError();
+  *__key = index;
   return 0;
 }