From 6137b485a08661b8e9d785bb049fbc54d7f261ec Mon Sep 17 00:00:00 2001
From: Gudmundur Adalsteinsson <ofpgummi@yahoo.com>
Date: Fri, 30 Aug 2019 20:46:32 +0000
Subject: [PATCH] Problem: C++11 partially supported on gcc 4.8

Solution: Use intrinsic instead of std::is_trivially_copyable for gcc
versions older than 5.
---
 README.md |  2 +-
 zmq.hpp   | 12 ++++++++++--
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 0489c65..3d0c04d 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ Supported platforms
  - Additional platforms that are known to work:
    - We have no current reports on additional platforms that are known to work yet. Please add your platform here. If CI can be provided for them with a cloud-based CI service working with GitHub, you are invited to add CI, and make it possible to be included in the list above.
  - Additional platforms that probably work:
-   - Any platform supported by libzmq that provides a sufficiently recent gcc (4.8.1 or newer) or clang (3.3 or newer)
+   - Any platform supported by libzmq that provides a sufficiently recent gcc (4.8.1 or newer) or clang (3.4.1 or newer)
    - Visual Studio 2012+ x86/x64
 
 Examples
diff --git a/zmq.hpp b/zmq.hpp
index 6791682..3b76a78 100644
--- a/zmq.hpp
+++ b/zmq.hpp
@@ -122,6 +122,14 @@
 #define ZMQ_DELETED_FUNCTION
 #endif
 
+#ifdef ZMQ_CPP11
+#if defined(__GNUC__) && __GNUC__ < 5
+#define ZMQ_IS_TRIVIALLY_COPYABLE(T) __has_trivial_copy(T)
+#else
+#define ZMQ_IS_TRIVIALLY_COPYABLE(T) std::is_trivially_copyable<T>::value
+#endif
+#endif
+
 #if ZMQ_VERSION >= ZMQ_MAKE_VERSION(3, 3, 0)
 #define ZMQ_NEW_MONITOR_EVENT_LAYOUT
 #endif
@@ -331,7 +339,7 @@ class message_t
     template<class Range,
              typename = typename std::enable_if<
                detail::is_range<Range>::value
-               && std::is_trivially_copyable<detail::range_value_t<Range>>::value
+               && ZMQ_IS_TRIVIALLY_COPYABLE(detail::range_value_t<Range>)
                && !std::is_same<Range, message_t>::value>::type>
     explicit message_t(const Range &rng) :
         message_t(detail::ranges::begin(rng), detail::ranges::end(rng))
@@ -948,7 +956,7 @@ template<class T> struct is_pod_like
     // trivially copyable OR standard layout.
     // Here we decide to be conservative and require both.
     static constexpr bool value =
-      std::is_trivially_copyable<T>::value && std::is_standard_layout<T>::value;
+      ZMQ_IS_TRIVIALLY_COPYABLE(T) && std::is_standard_layout<T>::value;
 };
 
 template<class C> constexpr auto seq_size(const C &c) noexcept -> decltype(c.size())