[libcxx] r312932 - mark mersenne_twister_engine<>::seed(result_type __sd) with _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK to placate UBSAN. Fixes PR#34160

[Marshall Clow via cfe-commits]

Author: marshall
Date: Mon Sep 11 11:10:33 2017
New Revision: 312932

URL: http://llvm.org/viewvc/llvm-project?rev=312932&view=rev
Log:
mark mersenne_twister_engine<>::seed(result_type __sd) with _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK to placate UBSAN. Fixes PR#34160



Modified:
    libcxx/trunk/include/random

Modified: libcxx/trunk/include/random
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/random?rev=312932&r1=312931&r2=312932&view=diff
==============================================================================
--- libcxx/trunk/include/random (original)
+++ libcxx/trunk/include/random Mon Sep 11 11:10:33 2017
@@ -2308,6 +2308,7 @@ template <class _UIntType, size_t __w, s
 void
 mersenne_twister_engine<_UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b,
     __t, __c, __l, __f>::seed(result_type __sd)
+    _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
 {   // __w >= 2
     __x_[0] = __sd & _Max;
     for (size_t __i = 1; __i < __n; ++__i)