Source: librsvg Version: 2.54.5+dfsg-1 Severity: serious Tags: ftbfs help Justification: fails to build from source (but built successfully in the past) X-Debbugs-Cc: debian-s...@lists.debian.org, debian-powerpc@lists.debian.org, ru...@packages.debian.org Forwarded: https://gitlab.gnome.org/GNOME/librsvg/-/issues/972
librsvg 2.54.5+dfsg-2 failed to build on s390x, powerpc and ppc64 with multiple test failures. At first glance, they seem to be the same test failures, meaning this is about endianness rather than any specific architecture. 2.54.5+dfsg-2 only contains packaging changes and no code changes, so I strongly suspect (but have not actually proved) that rebuilding 2.54.5+dfsg-1 with current versions of its dependencies would also exhibit the same test failures, similar to #1038252 on i386. The specific tests that are failing here are not the same as #1038252. The failing tests here are "reftests", which render a SVG image to PNG and compare the result with a known-good PNG. These are difficult to investigate in a buildd log, because they're very visual, but the librsvg buildd logs export the output images using uuencode, and I have extracted them from the s390x log and used them to open upstream bugs which show the rendering issue visually: - https://gitlab.gnome.org/GNOME/librsvg/-/issues/972 - https://gitlab.gnome.org/GNOME/librsvg/-/issues/973 - https://gitlab.gnome.org/GNOME/librsvg/-/issues/974 - https://gitlab.gnome.org/GNOME/librsvg/-/issues/975 - https://gitlab.gnome.org/GNOME/librsvg/-/issues/976 - https://gitlab.gnome.org/GNOME/librsvg/-/issues/977 - https://gitlab.gnome.org/GNOME/librsvg/-/issues/978 - https://gitlab.gnome.org/GNOME/librsvg/-/issues/979 - https://gitlab.gnome.org/GNOME/librsvg/-/issues/980 - https://gitlab.gnome.org/GNOME/librsvg/-/issues/981 - https://gitlab.gnome.org/GNOME/librsvg/-/issues/982 - https://gitlab.gnome.org/GNOME/librsvg/-/issues/983 - https://gitlab.gnome.org/GNOME/librsvg/-/issues/984 In all cases, the standalone steps to reproduce would be: render the SVG to PNG; look at the SVG and its reference rendering side-by-side; and the expected result is that they look the same. The most likely trigger for regressions between September 2022 and now would seem to be the upgrade of rustc from 1.61 to 1.63, since Cairo has not had significant changes for a while, none of the rendering differences involve text/fonts, and librsvg seems to do all its non-text rendering using vendored Rust libraries or its own Rust code rather than an external library like libpng. smcv
