Improve debuggability of Travis CI when things go wrong.

.travis.yml

@@ -22,5 +22,5 @@ script:
   - cd glslang && cmake . && make -j2 && cd ..
   - cd SPIRV-Tools && cmake . && make -j2 && cd ..
   - make -j2
-  - PATH=$PATH:./glslang/StandAlone:./SPIRV-Tools/tools
+  - PATH=./glslang/StandAlone:./SPIRV-Tools/tools:$PATH
   - ./test_shaders.py shaders

reference/shaders/frag/for-loop-init.frag

@@ -6,7 +6,7 @@ layout(location = 0) out mediump int FragColor;
 
 void main()
 {
-    FragColor = 15;
+    FragColor = 16;
     for (mediump int i = 0; i < 25; i++)
     {
         FragColor += 10;

shaders/frag/for-loop-init.frag

@@ -4,7 +4,7 @@ layout(location = 0) out int FragColor;
 
 void main()
 {
-   FragColor = 15;
+   FragColor = 16;
 
    // Basic loop variable.
    for (int i = 0; i < 25; i++)

test_shaders.py

@@ -137,6 +137,14 @@ def regression_check(shader, glsl, update, keep):
                 shutil.move(glsl, reference)
             else:
                 print('Generated GLSL in {} does not match reference {}!'.format(glsl, reference))
+                with open(glsl, 'r') as f:
+                    print('')
+                    print('Generated:')
+                    print('======================')
+                    print(f.read())
+                    print('======================')
+                    print('')
+
                 # Otherwise, fail the test. Keep the shader file around so we can inspect.
                 if not keep:
                     os.remove(glsl)