From cd60c4c9f908abe5f420c44ef46863b51f0b86e8 Mon Sep 17 00:00:00 2001
From: Nick Thompson <nathompson7@protonmail.com>
Date: Mon, 29 Oct 2018 08:52:20 -0600
Subject: [PATCH] [CI SKIP] Disable multiprecision in certain compilers.

---
 include/boost/integer/mod_inverse.hpp | 4 ++--
 test/extended_euclidean_test.cpp      | 9 +++++++--
 test/mod_inverse_test.cpp             | 8 +++++++-
 3 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/include/boost/integer/mod_inverse.hpp b/include/boost/integer/mod_inverse.hpp
index 7053efc..8836524 100644
--- a/include/boost/integer/mod_inverse.hpp
+++ b/include/boost/integer/mod_inverse.hpp
@@ -32,12 +32,12 @@ boost::optional<Z> mod_inverse(Z a, Z modulus)
     if (a == 0)
     {
         // a doesn't have a modular multiplicative inverse:
-        return {};
+        return boost::none;
     }
     euclidean_result_t<Z> u = extended_euclidean(a, modulus);
     if (u.gcd > 1)
     {
-        return {};
+        return boost::none;
     }
     // x might not be in the range 0 < x < m, let's fix that:
     while (u.x <= 0)
diff --git a/test/extended_euclidean_test.cpp b/test/extended_euclidean_test.cpp
index 45b9f02..ae7b866 100644
--- a/test/extended_euclidean_test.cpp
+++ b/test/extended_euclidean_test.cpp
@@ -4,8 +4,13 @@
  *  Boost Software License, Version 1.0. (See accompanying file
  *  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  */
-// A bug in gcc 4.8, not worth fixing, causes this to fail on gcc4.8.
-#if __GNUC__ > 4
+#if (defined(BOOST_MSVC) && (BOOST_MSVC < 1500)) || \
+     (defined(__clang_major__) && (__clang_major__ == 3) && (__clang_minor__ < 2)) || \
+     (defined(BOOST_GCC) && defined(BOOST_GCC_CXX11) && BOOST_GCC < 40800)
+#define DISABLE_MP_TESTS
+#endif
+
+#ifndef DISABLE_MP_TESTS
 #include <cassert>
 #include <boost/multiprecision/cpp_int.hpp>
 #include <boost/integer/common_factor.hpp>
diff --git a/test/mod_inverse_test.cpp b/test/mod_inverse_test.cpp
index 7367d15..bc29804 100644
--- a/test/mod_inverse_test.cpp
+++ b/test/mod_inverse_test.cpp
@@ -4,7 +4,13 @@
  *  Boost Software License, Version 1.0. (See accompanying file
  *  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  */
-#if __GNUC__ > 4
+#if (defined(BOOST_MSVC) && (BOOST_MSVC < 1500)) || \
+      (defined(__clang_major__) && (__clang_major__ == 3) && (__clang_minor__ < 2)) || \
+      (defined(BOOST_GCC) && defined(BOOST_GCC_CXX11) && BOOST_GCC < 40800)
+#define DISABLE_MP_TESTS
+#endif
+
+#ifndef DISABLE_MP_TESTS
 #include <cassert>
 #include <boost/multiprecision/cpp_int.hpp>
 #include <boost/integer/common_factor.hpp>