libpillowfight: autopkgtest failure on amd64 when built with LTO enabled

[Graham Inggs]

The autopkgtests of libpillowfight fail on amd64 when built with LTO enabled, as can be seen with 0.3.0-4build2 in jammy [1]. I've copied what I hope is the relevant part of the log below.

[1] https://autopkgtest.ubuntu.com/packages/libpillowfight/jammy/amd64

=================================== FAILURES ===================================
_____________________________ TestCanny.test_canny _____________________________

self = <tests.tests_canny.TestCanny testMethod=test_canny>

    def test_canny(self):
        with tempfile.NamedTemporaryFile(suffix='.jpg') as tmpfile:
            in_img = PIL.Image.open("tests/data/crappy_background.jpg")
            out_img = pillowfight.canny(in_img)
            in_img.close()

            # beware of JPG compression
            self.assertEqual(out_img.mode, "RGB")
            out_img.save(tmpfile.name)
            out_img.close()
            out_img = PIL.Image.open(tmpfile.name)

        expected_img = PIL.Image.open(
            "tests/data/crappy_background_canny.jpg"
        )
> self.assertEqual(out_img.tobytes(), expected_img.tobytes())
E AssertionError: b'\x0[92392 chars]00\x07\x07\x07\xb4\xb4\xb4\x00\x00\x00\t\t\t\x[13088988 chars]\x00' != b'\x0[92392 chars]00\x00\x00\x00\xbc\xbc\xbc\x00\x00\x00\x00\x00[13089030 chars]\x00'

tests/tests_canny.py:25: AssertionError

[Graham Inggs (ginggs)]

This was fixed in 0.3.0-4ubuntu1 [1]:

libpillowfight (0.3.0-4ubuntu1) jammy; urgency=medium

  * Turn off use of LTO on amd64, which results in a misbuild.

 -- Steve Langasek <email address hidden> Wed, 17 Nov 2021 21:44:34 +0000

[1] https://launchpad.net/ubuntu/+source/libpillowfight/0.3.0-4ubuntu1

[Graham Inggs (ginggs)]

I've confirmed that the problem still occurs with libpillowfight 0.3.0-5 in lunar.

I'll add libpillowfight to the lto-disabled-list for amd64 so it can be in sync with Debian.

[Launchpad Janitor (janitor)]

This bug was fixed in the package lto-disabled-list - 38

---------------
lto-disabled-list (38) lunar; urgency=medium

  * Add libpillowfight on amd64 to avoid autopkgtest failure (LP: #2007000)
  * Add gensio to avoid FTBFS due to missing symbols (LP: #1991617)

 -- Graham Inggs <email address hidden> Sat, 11 Feb 2023 17:05:01 +0000