Fix missing \n at end of file,

Fix some clang warnings.
Add gcc 7&8 to CI tests.

.travis.yml

@@ -102,6 +102,42 @@ matrix:
           sources:
             - ubuntu-toolchain-r-test
 
+    - os: linux
+      env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=03,11 CXXSTD_DIALECT=cxxstd-dialect=gnu
+      addons:
+        apt:
+          packages:
+            - g++-7
+          sources:
+            - ubuntu-toolchain-r-test
+
+    - os: linux
+      env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=14,1z CXXSTD_DIALECT=cxxstd-dialect=gnu
+      addons:
+        apt:
+          packages:
+            - g++-7
+          sources:
+            - ubuntu-toolchain-r-test
+
+    - os: linux
+      env: TOOLSET=gcc COMPILER=g++-8 CXXSTD=03,11 CXXSTD_DIALECT=cxxstd-dialect=gnu
+      addons:
+        apt:
+          packages:
+            - g++-8
+          sources:
+            - ubuntu-toolchain-r-test
+
+    - os: linux
+      env: TOOLSET=gcc COMPILER=g++-8 CXXSTD=14,1z CXXSTD_DIALECT=cxxstd-dialect=gnu
+      addons:
+        apt:
+          packages:
+            - g++-8
+          sources:
+            - ubuntu-toolchain-r-test
+
     - os: linux
       env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11
 

include/boost/regex/v4/instances.hpp

@@ -124,8 +124,10 @@ template class BOOST_REGEX_TEMPLATE_DECL ::boost::BOOST_REGEX_DETAIL_NS::perl_ma
 
 #ifdef __clang__
 #pragma clang diagnostic push
+#if (__clang_major__ > 3) || ((__clang_major__ == 3) && (__clang_minor__ > 5))
 #pragma clang diagnostic ignored "-Wkeyword-macro"
 #endif
+#endif
 
 #  ifndef BOOST_REGEX_INSTANTIATE
 #     ifdef __GNUC__

test/test_warnings.cpp

@@ -1,7 +1,23 @@
+/*
+*
+* Copyright (c) 2018
+* John Maddock
+*
+* Use, modification and distribution are subject to the
+* Boost Software License, Version 1.0. (See accompanying file
+* LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+*
+*/
+
+
 #ifdef _MSC_VER
 #pragma warning(disable:4820 4668)
 #endif
 
+#ifdef __APPLE_CC__
+#pragma clang diagnostic ignored "-Wc++11-long-long"
+#endif
+
 #include <boost/regex.hpp>
 
 void test_proc()
@@ -10,3 +26,4 @@ void test_proc()
    boost::regex exp(re);
    regex_match(text, exp);
 }
+