Rebuild for libxml2212

[regro-cf-autotick-bot]

This PR has been triggered in an effort to update libxml2212.

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[conda-forge-webservices[bot]]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[xylar]

Hmm, clang is unhappy with the type of a function pointer:

  /Users/runner/miniforge3/conda-bld/python-igraph_1701361377382/_build_env/bin/x86_64-apple-darwin13.4.0-clang -DIGRAPH_STATIC -DIGRAPH_VERIFY_FINALLY_STACK=0 -DNCOMPLEX -DPRPACK_IGRAPH_SUPPORT=1 -D_POSIX_C_SOURCE=200809L -DIGRAPH_FILE_BASENAME=\"src/io/graphml.c\" -I/Users/runner/miniforge3/conda-bld/python-igraph_1701361377382/work/vendor/source/igraph/include -I/Users/runner/miniforge3/conda-bld/python-igraph_1701361377382/work/vendor/build/igraph/include -I/Users/runner/miniforge3/conda-bld/python-igraph_1701361377382/work/vendor/build/igraph/src -I/Users/runner/miniforge3/conda-bld/python-igraph_1701361377382/work/vendor/source/igraph/src -I/Users/runner/miniforge3/conda-bld/python-igraph_1701361377382/work/vendor/source/igraph/vendor -I/Users/runner/miniforge3/conda-bld/python-igraph_1701361377382/work/vendor/source/igraph/vendor/plfit -I/Users/runner/miniforge3/conda-bld/python-igraph_1701361377382/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_place/include/libxml2 -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -isystem /Users/runner/miniforge3/conda-bld/python-igraph_1701361377382/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_place/include -fdebug-prefix-map=/Users/runner/miniforge3/conda-bld/python-igraph_1701361377382/work=/usr/local/src/conda/python-igraph-0.11.3 -fdebug-prefix-map=/Users/runner/miniforge3/conda-bld/python-igraph_1701361377382/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_place=/usr/local/src/conda-prefix -O3 -DNDEBUG -std=gnu99 -flto=thin -isysroot /Applications/Xcode_13.2.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk -mmacosx-version-min=10.9 -fPIC -fvisibility=hidden -Wall -Wextra -pedantic -Wstrict-prototypes -Wno-unused-function -Wno-unused-parameter -Wno-unused-but-set-variable -Wno-sign-compare -Wno-constant-logical-operand -Wno-unknown-warning-option -MD -MT src/CMakeFiles/igraph.dir/io/graphml.c.o -MF src/CMakeFiles/igraph.dir/io/graphml.c.o.d -o src/CMakeFiles/igraph.dir/io/graphml.c.o -c /Users/runner/miniforge3/conda-bld/python-igraph_1701361377382/work/vendor/source/igraph/src/io/graphml.c
  /Users/runner/miniforge3/conda-bld/python-igraph_1701361377382/work/vendor/source/igraph/src/io/graphml.c:1613:39: error: incompatible function pointer types passing 'void (*)(void *, xmlErrorPtr)' (aka 'void (*)(void *, struct _xmlError *)') to parameter of type 'xmlStructuredErrorFunc' (aka 'void (*)(void *, const struct _xmlError *)') [-Wincompatible-function-pointer-types]
      xmlSetStructuredErrorFunc(&state, &igraph_i_libxml_structured_error_handler);
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  /Users/runner/miniforge3/conda-bld/python-igraph_1701361377382/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_place/include/libxml2/libxml/xmlerror.h:898:29: note: passing argument to parameter 'handler' here
                                   xmlStructuredErrorFunc handler);
                                                          ^

[vtraag]

Seems to be a result of more stricter checks by clang. I'm looking into it here: https://github.com/conda-forge/igraph-feedstock/pull/63. It's a bit easier to correct it there instead of here, since less builds are triggered. Once that passes, I'll also push the patch to here, and push it upstream to the igraph repo.

[vtraag]

Sorry, the change is actually part of the upgrade to libxml2 2.12. In https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.12.0 they indeed state that

To prepare for future improvements, some API functions now expect or return a const xmlError struct.

It's just noticed by clang because of the stricter checks.

[xylar]

Sounds very sensible.

[vtraag]

I've now pushed a patch here as well, and I think it should be good. However, we should wait for CI to pass. I have to go now though, feel free to merge @xylar, if all is good and you happen to get around to it before I do.