Detect trailing whitespace

.travis.yml

@@ -21,6 +21,7 @@ install:
   - cd agbcc && ./build.sh && ./install.sh $TRAVIS_BUILD_DIR
 script:
   - cd $TRAVIS_BUILD_DIR
+  - ./whitespace.sh
   - ./build_tools.sh
   - make -j2 compare_ruby
   - make -j2 compare_ruby_rev1

whitespace.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+if grep -Enr "\s+\$" src; then
+    # Trailing whitespace detected
+    exit 1
+fi