From 95950392f8fcbb312e7374c28c691c100ff9edac Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Wed, 16 Dec 2020 14:50:15 +0000
Subject: [PATCH] Warning suppression.

---
 include/boost/regex/config.hpp                | 22 ++++++++++++++-----
 .../boost/regex/v4/regex_token_iterator.hpp   |  2 ++
 .../boost/regex/v5/regex_token_iterator.hpp   |  1 +
 3 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/include/boost/regex/config.hpp b/include/boost/regex/config.hpp
index 24c13b25..a221b155 100644
--- a/include/boost/regex/config.hpp
+++ b/include/boost/regex/config.hpp
@@ -126,8 +126,23 @@
 #ifdef BOOST_FALLTHROUGH
 #  define BOOST_REGEX_FALLTHROUGH BOOST_FALLTHROUGH
 #else
+
+#if defined(__clang__) && (__cplusplus >= 201103L) && defined(__has_warning)
+#  if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
+#    define BOOST_REGEX_FALLTHROUGH [[clang::fallthrough]]
+#  endif
+#endif
+#if !defined(BOOST_REGEX_FALLTHROUGH) && defined(__INTEL_COMPILER) && (__INTEL_COMPILER >= 1800) && (__cplusplus >= 201703)
+#  define BOOST_REGEX_FALLTHROUGH [[fallthrough]]
+#endif
+#if !defined(BOOST_REGEX_FALLTHROUGH) && defined(__GNUC__) && (__GNUC__ >= 7)
+#  define BOOST_REGEX_FALLTHROUGH __attribute__((fallthrough))
+#endif
+
+#if !defined(BOOST_REGEX_FALLTHROUGH)
 #  define BOOST_REGEX_FALLTHROUGH
 #endif
+#endif
 
 
 /*
@@ -219,12 +234,7 @@
  *
  ****************************************************************************/
 
-#if !defined(BOOST_SYMBOL_EXPORT)
-#  define BOOST_SYMBOL_EXPORT
-#  define BOOST_SYMBOL_IMPORT
-#endif
-
-#if (defined(BOOST_REGEX_DYN_LINK) || defined(BOOST_ALL_DYN_LINK)) && !defined(BOOST_REGEX_STATIC_LINK)
+#if (defined(BOOST_REGEX_DYN_LINK) || defined(BOOST_ALL_DYN_LINK)) && !defined(BOOST_REGEX_STATIC_LINK) && defined(BOOST_SYMBOL_IMPORT)
 #  if defined(BOOST_REGEX_SOURCE)
 #     define BOOST_REGEX_BUILD_DLL
 #     define BOOST_REGEX_DECL BOOST_SYMBOL_EXPORT
diff --git a/include/boost/regex/v4/regex_token_iterator.hpp b/include/boost/regex/v4/regex_token_iterator.hpp
index ab15a257..fc54b3c9 100644
--- a/include/boost/regex/v4/regex_token_iterator.hpp
+++ b/include/boost/regex/v4/regex_token_iterator.hpp
@@ -66,6 +66,8 @@ class regex_token_iterator_implementation
    std::vector<int>                     subs;   // the sub-expressions to enumerate
 
 public:
+   regex_token_iterator_implementation(const regex_token_iterator_implementation& other)
+      : what(other.what), base(other.base), end(other.end), re(other.re), flags(other.flags), result(other.result), N(other.N), subs(other.subs) {}
    regex_token_iterator_implementation(const regex_type* p, BidirectionalIterator last, int sub, match_flag_type f)
       : end(last), re(*p), flags(f), N(0){ subs.push_back(sub); }
    regex_token_iterator_implementation(const regex_type* p, BidirectionalIterator last, const std::vector<int>& v, match_flag_type f)
diff --git a/include/boost/regex/v5/regex_token_iterator.hpp b/include/boost/regex/v5/regex_token_iterator.hpp
index a21de34d..40ebc5e7 100644
--- a/include/boost/regex/v5/regex_token_iterator.hpp
+++ b/include/boost/regex/v5/regex_token_iterator.hpp
@@ -67,6 +67,7 @@ public:
          subs.push_back(submatches[i]);
       }
    }
+   regex_token_iterator_implementation(const regex_token_iterator_implementation& other) = default;
    bool init(BidirectionalIterator first)
    {
       N = 0;