[llvm] r201124 - Hopefully fixing the MinGW 32 build, which was broken by r200767. Not using rand_s() since MinGW does not have an implementation for it, but instead using the underlying CryptGenRandom APIs.

[Aaron Ballman]

Author: aaronballman
Date: Mon Feb 10 20:47:33 2014
New Revision: 201124

URL: http://llvm.org/viewvc/llvm-project?rev=201124&view=rev
Log:
Hopefully fixing the MinGW 32 build, which was broken by r200767. Not using rand_s() since MinGW does not have an implementation for it, but instead using the underlying CryptGenRandom APIs.

Modified:
    llvm/trunk/lib/Support/Process.cpp
    llvm/trunk/lib/Support/Windows/Process.inc

Modified: llvm/trunk/lib/Support/Process.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Process.cpp?rev=201124&r1=201123&r2=201124&view=diff
==============================================================================
--- llvm/trunk/lib/Support/Process.cpp (original)
+++ llvm/trunk/lib/Support/Process.cpp Mon Feb 10 20:47:33 2014
@@ -12,11 +12,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Config/config.h"
-#if LLVM_ON_WIN32
-  // This define makes stdlib.h declare the rand_s function.
-#define _CRT_RAND_S
-#include <stdlib.h>
-#endif
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/Process.h"
 

Modified: llvm/trunk/lib/Support/Windows/Process.inc
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Windows/Process.inc?rev=201124&r1=201123&r2=201124&view=diff
==============================================================================
--- llvm/trunk/lib/Support/Windows/Process.inc (original)
+++ llvm/trunk/lib/Support/Windows/Process.inc Mon Feb 10 20:47:33 2014
@@ -362,8 +362,15 @@ const char *Process::ResetColor() {
 }
 
 unsigned Process::GetRandomNumber() {
-  unsigned int result;
-  const int ec = rand_s(&result);
-  assert(ec == 0 && "rand_s failed");
-  return result;
+  HCRYPTPROV HCPC;
+  if (!::CryptAcquireContextW(&HCPC, NULL, NULL, PROV_RSA_FULL,
+                              CRYPT_VERIFYCONTEXT))
+    assert(false && "Could not acquire a cryptographic context");
+
+  ScopedCryptContext CryptoProvider(HCPC);
+  unsigned Ret;
+  if (!::CryptGenRandom(CryptoProvider, sizeof(Ret),
+                        reinterpret_cast<BYTE *>(&Ret)))
+    assert(false && "Could not generate a random number");
+  return Ret;
 }