libstdc++: Do not use static_assert without message in C++11

libstdc++-v3/ChangeLog:

	* include/bits/random.tcc (__representable_as_double)
	(__p1_representable_as_double): Add "" to static asserts.

(cherry picked from commit 64ba45c76e831914764b70207d69a06f800b43a4)

diff --git a/libstdc++-v3/include/bits/random.tcc b/libstdc++-v3/include/bits/random.tcc
index bf4397045ef230b8967cd1e4469f21e3f02d4ce1..1357e181874df14a5a35afdad1dc65dfc7eed7e2 100644 (file)
--- a/libstdc++-v3/include/bits/random.tcc
+++ b/libstdc++-v3/include/bits/random.tcc
@@ -811,8 +811,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       constexpr bool
       __representable_as_double(_Tp __x) noexcept
       {
-       static_assert(numeric_limits<_Tp>::is_integer);
-       static_assert(!numeric_limits<_Tp>::is_signed);
+       static_assert(numeric_limits<_Tp>::is_integer, "");
+       static_assert(!numeric_limits<_Tp>::is_signed, "");
        // All integers <= 2^53 are representable.
        return (__x <= (1ull << __DBL_MANT_DIG__))
          // Between 2^53 and 2^54 only even numbers are representable.
@@ -824,8 +824,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       constexpr bool
       __p1_representable_as_double(_Tp __x) noexcept
       {
-       static_assert(numeric_limits<_Tp>::is_integer);
-       static_assert(!numeric_limits<_Tp>::is_signed);
+       static_assert(numeric_limits<_Tp>::is_integer, "");
+       static_assert(!numeric_limits<_Tp>::is_signed, "");
        return numeric_limits<_Tp>::digits < __DBL_MANT_DIG__
          || (bool(__x + 1u) // return false if x+1 wraps around to zero
              && __detail::__representable_as_double(__x + 1u));