3.10.0a0 Yarl Compile Error

[cooperlees]

Seems there is a problem compiling with __Pyx_PyList_Append:

 gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -fPIC -I/home/travis/virtualenv/python3.10-dev/include -I/opt/python/3.10-dev/include/python3.10 -c yarl/_quoting.c -o build/temp.linux-x86_64-3.10/yarl/_quoting.o
    yarl/_quoting.c: In function ‘__Pyx_PyList_Append’:
    yarl/_quoting.c:1245:23: error: lvalue required as left operand of assignment
             Py_SIZE(list) = len+1;
                           ^
    error: command '/usr/bin/gcc' failed with exit code 1

Full build: https://travis-ci.org/github/pypa/bandersnatch/jobs/694378588
Seems it might be a Cython bug since lxml is having the issues too.

[webknjaz]

Right, it should be a Cython bug so report this to their tracker or maybe try Cython from master.

[JustinTArthur]

It's fixed in the upcoming Cython 0.29.20, but it since the pypi package for yarl ships with pre-cythoized C code, this will still break (tracked in #457) in pip installs of existing yarl packages.

[asvetlov]

yarl 1.5.0 will be published with generated C files made by Cython 0.29.21