Visual Studio generally warns when casting a 32-bit integer to pointer
type, because it presumes that you may have truncated a pointer in a
way that is nonportable to 64-bit builds. Here, the sign-extension of
-1 to pointer size is correct and matches the specification of
_beginthreadex, so we just cast to intptr_t to suppress the warning.

(intptr_t is tagged with the __w64 keyword to tell Visual Studio that
it is a type that expands to 64 bits in Win64, so it should not warn
about casts between pointers and intptr_t.)

---
 lib/curl_threads.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/lib/curl_threads.c b/lib/curl_threads.c
index c9e91f6..3282efa 100644
--- a/lib/curl_threads.c
+++ b/lib/curl_threads.c
@@ -104,7 +104,7 @@ curl_thread_t Curl_thread_create(unsigned int (CURL_STDCALL *func) (void*),
 #else
   curl_thread_t t;
   t = (curl_thread_t)_beginthreadex(NULL, 0, func, arg, 0, NULL);
-  if((t == 0) || (t == (curl_thread_t)-1L))
+  if((t == 0) || (t == (curl_thread_t)(intptr_t)-1L))
     return curl_thread_t_null;
   return t;
 #endif
-- 
1.7.1
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