Bug 1771023

Created attachment 1634965 [details]
build log from failed i686 build

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This bug appears to have been reported against 'rawhide' during the Fedora 34 development cycle.
Changing version to 34.

This bug appears to have been reported against 'rawhide' during the Fedora 35 development cycle.
Changing version to 35.

Updating this bug to reflect current status. Here is a sample error:

Now the problem looks like:

>   ../../../src/pcg-cpp/include/pcg_random.hpp:1247:40: error: call to
>       non-'constexpr' function 'pcg_extras::uint_x4<U, V>
>       pcg_extras::operator-(const pcg_extras::uint_x4<U, V>&, const
>       pcg_extras::uint_x4<U, V>&) [with UInt = unsigned int; UIntX2 = long
>       long unsigned int]'
>    1247 |         (state_type(1U) << table_pow2) - state_type(1U);
>         |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
>   In file included from ../../../src/pcg-cpp/include/pcg_extras.hpp:84,
>                    from ../../../src/pcg-cpp/include/pcg_random.hpp:114,
>                    from ../../../src/graph/random.hh:21,
>                    from graph_motifs.hh:26,
>                    from graph_motifs.cc:24:
>   ../../../src/pcg-cpp/include/pcg_uint128.hpp:642:22: note:
>       'pcg_extras::uint_x4<U, V> pcg_extras::operator-(const
>       pcg_extras::uint_x4<U, V>&, const pcg_extras::uint_x4<U, V>&) [with
>       UInt = unsigned int; UIntX2 = long long unsigned int]' declared here
>     642 | uint_x4<UInt,UIntX2> operator-(const uint_x4<UInt,UIntX2>& a,
>         |                      ^~~~~~~~


As noted earlier in this issue, this was previously reported upstream at https://git.skewed.de/count0/graph-tool/issues/617, although we can expect that upstream won’t work on it unless we inform them that it’s still a problem on the current version.

The armv7hl architecture is also affected (https://bugzilla.redhat.com/show_bug.cgi?id=1771024), so this appears to be a 32-bit issue. I haven’t yet tried to fix it.

The root cause is this issue in pcg-cpp: https://github.com/imneme/pcg-cpp/issues/64

This bug appears to have been reported against 'rawhide' during the Fedora 36 development cycle.
Changing version to 36.

https://fedoraproject.org/wiki/Changes/EncourageI686LeafRemoval