ceedling linker flags
diff --git a/vendor/ceedling/lib/ceedling/defaults.rb b/vendor/ceedling/lib/ceedling/defaults.rb
--- a/vendor/ceedling/lib/ceedling/defaults.rb
+++ b/vendor/ceedling/lib/ceedling/defaults.rb
@@ -32,6 +32,7 @@
:arguments => [
"\"${1}\"".freeze,
"-o \"${2}\"".freeze,
+ "-lm".freeze,
].freeze
}