Disable span_constexpr_test under GCC 4.x

include/boost/core/detail/assert.hpp

@@ -1,18 +0,0 @@
-/*
-Copyright 2025 Glen Joseph Fernandes
-(glenjofe@gmail.com)
-
-Distributed under the Boost Software License, Version 1.0.
-(http://www.boost.org/LICENSE_1_0.txt)
-*/
-#undef BOOST_CORE_DETAIL_ASSERT
-
-#if !defined(__clang__) && \
-    !defined(__INTEL_COMPILER) && \
-    defined(__GNUC__) && \
-    (__GNUC__ < 5)
-#define BOOST_CORE_DETAIL_ASSERT(expr) void(0)
-#else
-#include <boost/assert.hpp>
-#define BOOST_CORE_DETAIL_ASSERT(expr) BOOST_ASSERT(expr)
-#endif

include/boost/core/span.hpp

@@ -8,12 +8,20 @@ Distributed under the Boost Software License, Version 1.0.
 #ifndef BOOST_CORE_SPAN_HPP
 #define BOOST_CORE_SPAN_HPP
 
-#include <boost/core/detail/assert.hpp>
 #include <boost/core/data.hpp>
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
 #include <array>
 #include <iterator>
 #include <type_traits>
 
+#if BOOST_WORKAROUND(BOOST_GCC, < 50000)
+# define BOOST_CORE_SPAN_CONSTEXPR
+#else
+# define BOOST_CORE_SPAN_CONSTEXPR constexpr
+#endif
+
 namespace boost {
 
 constexpr std::size_t dynamic_extent = static_cast<std::size_t>(-1);
@@ -274,19 +282,19 @@ public:
         return span<T, C>(s_.p + O, C);
     }
 
-    constexpr span<T, dynamic_extent> first(size_type c) const {
-        return BOOST_CORE_DETAIL_ASSERT(c <= size()),
+    BOOST_CORE_SPAN_CONSTEXPR span<T, dynamic_extent> first(size_type c) const {
+        return BOOST_ASSERT(c <= size()),
             span<T, dynamic_extent>(s_.p, c);
     }
 
-    constexpr span<T, dynamic_extent> last(size_type c) const {
-        return BOOST_CORE_DETAIL_ASSERT(c <= size()),
+    BOOST_CORE_SPAN_CONSTEXPR span<T, dynamic_extent> last(size_type c) const {
+        return BOOST_ASSERT(c <= size()),
             span<T, dynamic_extent>(s_.p + (s_.n - c), c);
     }
 
-    constexpr span<T, dynamic_extent> subspan(size_type o,
+    BOOST_CORE_SPAN_CONSTEXPR span<T, dynamic_extent> subspan(size_type o,
         size_type c = dynamic_extent) const {
-        return BOOST_CORE_DETAIL_ASSERT(o <= size() &&
+        return BOOST_ASSERT(o <= size() &&
                 (c == dynamic_extent || c + o <= size())),
             span<T, dynamic_extent>(s_.p + o,
                 c == dynamic_extent ? s_.n - o : c);
@@ -304,16 +312,16 @@ public:
         return s_.n == 0;
     }
 
-    constexpr reference operator[](size_type i) const {
-        return BOOST_CORE_DETAIL_ASSERT(i < size()), s_.p[i];
+    BOOST_CORE_SPAN_CONSTEXPR reference operator[](size_type i) const {
+        return BOOST_ASSERT(i < size()), s_.p[i];
     }
 
-    constexpr reference front() const {
-        return BOOST_CORE_DETAIL_ASSERT(!empty()), *s_.p;
+    BOOST_CORE_SPAN_CONSTEXPR reference front() const {
+        return BOOST_ASSERT(!empty()), *s_.p;
     }
 
-    constexpr reference back() const {
-        return BOOST_CORE_DETAIL_ASSERT(!empty()), s_.p[s_.n - 1];
+    BOOST_CORE_SPAN_CONSTEXPR reference back() const {
+        return BOOST_ASSERT(!empty()), s_.p[s_.n - 1];
     }
 
     constexpr pointer data() const noexcept {
@@ -403,4 +411,6 @@ as_writable_bytes(span<T, E> s) noexcept
 
 } /* boost */
 
+#undef BOOST_CORE_SPAN_CONSTEXPR
+
 #endif

test/span_constexpr_test.cpp

@@ -6,7 +6,8 @@ Distributed under the Boost Software License, Version 1.0.
 (http://www.boost.org/LICENSE_1_0.txt)
 */
 #include <boost/config.hpp>
-#if !defined(BOOST_NO_CXX11_CONSTEXPR)
+#include <boost/config/workaround.hpp>
+#if !defined(BOOST_NO_CXX11_CONSTEXPR) && !BOOST_WORKAROUND(BOOST_GCC, < 50000)
 #include <boost/core/span.hpp>
 #include <boost/core/lightweight_test.hpp>