Crash in Ardour6 on Fedora 34

[baumgartnerniels]

Hello

I just tried installing and running liquidsfz in Ardour 6 on a Fedora 34 machine.
When Ardour loads the lv2 plugin it crashes with:

Reading player:liquidsfz took 500 microseconds, final size = 0
/usr/include/c++/11/bits/stl_vector.h:1045: std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) [with _Tp = char; _Alloc = std::allocator<char>; std::vector<_Tp, _Alloc>::reference = char&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]: Assertion '__n < this->size()' failed.
zsh: IOT instruction (core dumped) ardour6

I found some Github Issues in random projects that have the same stl_vector issue after compiling their software with a new gcc version. Maybe the are useful for reference. They all were related to actual bugs that were detected by the new gcc.
msoos/cryptominisat#643
mamedev/mame#7760
arminbiere/cadical#31

Previous discussion here with @ycollet who maintains the packaged version for Fedora I tried to install:
https://github.com/ycollet/fedora-spec/issues/25

[swesterfeld]

This could be the same problem as this one #34 and if that is the case, it should be fixed by this commit 01f0eb8

So please let me know if you still have problems when using the latest release, liquidsfz-0.3.1 (or build from github/master).