Added GCC 8 to Travis. Updated test so that it warning isn't triggered.

.travis.yml

@@ -117,6 +117,14 @@ matrix:
           packages: ['g++-7']
       env: COMPILER='g++-7'
 
+    - os: linux
+      compiler: gcc
+      addons: &gcc8
+        apt:
+          sources: *all_sources
+          packages: ['g++-8']
+      env: COMPILER='g++-8'
+
     # 3b/ Linux C++14 Clang builds
     # Note that we need newer libstdc++ for C++14 support
     - os: linux
@@ -173,6 +181,11 @@ matrix:
       addons: *gcc7
       env: COMPILER='g++-7' CPP14=1
 
+    - os: linux
+      compiler: gcc
+      addons: *gcc8
+      env: COMPILER='g++-8' CPP14=1
+
     # 5/ OSX Clang Builds
     - os: osx
       osx_image: xcode7.3

projects/SelfTest/UsageTests/Misc.tests.cpp

@@ -304,7 +304,7 @@ TEST_CASE( "toString on const wchar_t pointer returns the string contents", "[to
 }
 
 TEST_CASE( "toString on wchar_t const pointer returns the string contents", "[toString]" ) {
-        auto const s = const_cast<wchar_t* const>( L"wide load" );
+        auto const s = const_cast<wchar_t*>( L"wide load" );
         std::string result = ::Catch::Detail::stringify( s );
         CHECK( result == "\"wide load\"" );
 }