Add configuration for C++14 type traits changes

Author: mborland

config/Jamfile.v2

@@ -36,6 +36,7 @@ obj has_gmp : has_gmp.cpp :
 obj is_ci_sanitizer_run : is_ci_sanitizer_run.cpp ;
 obj is_ci_standalone_run : is_ci_standalone_run.cpp ;
 obj is_cygwin_run : is_cygwin_run.cpp ;
+obj has_cxx14_type_traits : has_cxx14_type_traits.cpp ;
 
 explicit has_long_double_support ;
 explicit has_mpfr_class ;
@@ -52,3 +53,4 @@ explicit has_fftw3 ;
 explicit is_ci_sanitizer_run ;
 explicit is_ci_standalone_run ;
 explicit is_cygwin_run ;
+explicit has_cxx14_type_traits ;

config/has_cxx14_type_traits.cpp

@@ -0,0 +1,14 @@
+// Copyright 2025 Matt Borland
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <type_traits>
+#include <cstdint>
+
+using big_int = std::conditional_t<(sizeof(long) > sizeof(std::uint32_t)), long, std::uint32_t>;
+static_assert(sizeof(big_int) >= sizeof(std::uint32_t), "big_int is too small");
+
+int main()
+{
+    return 0;
+}