report GCC version

Author: ianfixes

CHANGELOG.md

@@ -6,6 +6,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 ### Added
+- `CppLibrary` can now report `gcc_version`
 
 ### Changed
 

lib/arduino_ci/cpp_library.rb

@@ -127,6 +127,13 @@ def run_gcc(*args, **kwargs)
       success
     end
 
+    # Return the GCC version
+    # @return [String] the version reported by `gcc -v`
+    def gcc_version
+      return nil unless run_gcc("-v")
+      @last_err
+    end
+
     # GCC command line arguments for including aux libraries
     # @param aux_libraries [String] The external Arduino libraries required by this project
     # @return [Array<String>] The GCC command-line flags necessary to include those libraries