polly.py --verbose --config Release --toolchain gcc-7-cxx17 --fwd HUNTER_CONFIGURATION_TYPES=Release --test

...
1: 320 x 240 mean [250.808, 250.804, 250.813, 0] to file: /.../_builds/gcc-7-cxx17-Release/__output/frame-845.png
1: 320 x 240 mean [250.796, 250.792, 250.801, 0] to file: /.../_builds/gcc-7-cxx17-Release/__output/frame-846.png
1: 320 x 240 mean [250.793, 250.788, 250.798, 0] to file: /.../_builds/gcc-7-cxx17-Release/__output/frame-847.png
1: 320 x 240 mean [250.784, 250.781, 250.787, 0] to file: /.../_builds/gcc-7-cxx17-Release/__output/frame-848.png
1: 320 x 240 mean [250.773, 250.77, 250.776, 0] to file: /.../_builds/gcc-7-cxx17-Release/__output/frame-849.png
1: 320 x 240 mean [250.765, 250.763, 250.766, 0] to file: /.../_builds/gcc-7-cxx17-Release/__output/frame-850.png
1: 320 x 240 mean [250.756, 250.754, 250.758, 0] to file: /.../_builds/gcc-7-cxx17-Release/__output/frame-851.png
1/1 Test #1: foo ..............................   Passed    1.89 sec