From 2aa78667cbcc3aec05d3806b448ca8c18156b9e3 Mon Sep 17 00:00:00 2001
From: Matt Borland <matt@mattborland.com>
Date: Mon, 22 Aug 2022 18:56:59 -0700
Subject: [PATCH] Fix GCC 5 error for static_assert without message

---
 include/boost/math/special_functions/fast_float_distance.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/boost/math/special_functions/fast_float_distance.hpp b/include/boost/math/special_functions/fast_float_distance.hpp
index 17ddbd3373..e350c8efd2 100644
--- a/include/boost/math/special_functions/fast_float_distance.hpp
+++ b/include/boost/math/special_functions/fast_float_distance.hpp
@@ -63,7 +63,7 @@ boost::multiprecision::int128_type fast_float_distance(boost::multiprecision::fl
         BOOST_MATH_THROW_EXCEPTION(std::domain_error("Both arguments to fast_float_distnace must be finite"));
     }
 
-    static_assert(sizeof(boost::multiprecision::int128_type) == sizeof(boost::multiprecision::float128_type));
+    static_assert(sizeof(boost::multiprecision::int128_type) == sizeof(boost::multiprecision::float128_type), "float128 is the wrong size");
 
     boost::multiprecision::int128_type ai;
     boost::multiprecision::int128_type bi;