[Sandbox::FileAccessor] Add C++ Sources (.cxx, .c++)

CHANGELOG.md

@@ -12,8 +12,10 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [Marius Rackwitz](https://github.com/mrackwitz)
   [#3440](https://github.com/CocoaPods/CocoaPods/issues/3440)
 
-* C++ source files with `.cc` extension now have their compiler flags set correctly.  
+* C++ source files with `.cc`, `.cxx` and `.c++` extensions now have their
+  compiler flags set correctly.  
   [Chongyu Zhu](https://github.com/lembacon)
+  [Kyle Fuller](https://github.com/kylef)
 
 * Fix an issue when installing Pods with executable files or broken symlinks
   when installing a Pod.  

lib/cocoapods/sandbox/file_accessor.rb

@@ -8,7 +8,7 @@ module Pod
     #
     class FileAccessor
       HEADER_EXTENSIONS = Xcodeproj::Constants::HEADER_FILES_EXTENSIONS
-      SOURCE_FILE_EXTENSIONS = (%w(.m .mm .c .cc .cpp .swift) + HEADER_EXTENSIONS).uniq.freeze
+      SOURCE_FILE_EXTENSIONS = (%w(.m .mm .c .cc .cxx .cpp .c++ .swift) + HEADER_EXTENSIONS).uniq.freeze
 
       GLOB_PATTERNS = {
         :readme              => 'readme{*,.*}'.freeze,

spec/unit/sandbox/file_accessor_spec.rb

@@ -211,7 +211,7 @@ module Pod
           file_patterns = ['Classes/*.{h,m,d}', 'Vendor']
           options = {
             :exclude_patterns => ['Classes/**/osx/**/*', 'Resources/**/osx/**/*'],
-            :dir_pattern => '*{.m,.mm,.c,.cc,.cpp,.swift,.h,.hh,.hpp,.ipp,.tpp}',
+            :dir_pattern => '*{.m,.mm,.c,.cc,.cxx,.cpp,.c++,.swift,.h,.hh,.hpp,.ipp,.tpp}',
             :include_dirs => false,
           }
           @spec.exclude_files = options[:exclude_patterns]