This test uses std::log2 without including <cmath>, but it doesn't need
to use it at all. Just get the number of digits from numeric_limits
instead.
libstdc++-v3/ChangeLog:
* testsuite/26_numerics/random/random_device/entropy.cc: Use
numeric_limits<unsigned>::digits.
(cherry picked from commit
78fd15fd4a641cfac28ce60bf43a3e1ca309537b)
// { dg-do run { target c++11 } }
#include <random>
+#include <limits>
#include <testsuite_hooks.h>
#include <testsuite_random.h>
VERIFY( std::random_device(token).entropy() == 0.0 );
using result_type = std::random_device::result_type;
- const double max = std::log2(std::numeric_limits<result_type>::max() + 1.0);
+ const double max = std::numeric_limits<result_type>::digits;
for (auto token : { "/dev/random", "/dev/urandom" })
if (__gnu_test::random_device_available(token))