Created attachment 523972 [details] build.log The build of dev-libs/json-glib-1.4.2::gnome[abi_x86_32] aborts with the multilib error message "Header files have changed between ABIs".
Created attachment 523974 [details] emerge --info dev-libs/json-glib
Created attachment 524254 [details, diff] diff -u work/json-glib-1.4.2-abi_x86_*/json-glib/json-enum-types.h The difference between the two versions of work/json-glib-1.4.2-abi_x86_*/json-glib/json-enum-types.h is really minor: the comment `/* enumerations from "/var/tmp/portage/..." */` contains different paths. I was able to "fix" that by simply running sed "s/${BUILD_DIR}/${S}/" on all header files from multilib_src_compile(). Someone with more insight into Meson, Glib or Gnome can probably build a more sophisticated and less blunt fix.
Created attachment 528222 [details, diff] Patch to resolve header difference caused by glib-mkenums This patch (like the others for atk and at-spi2-core) resolves the issue by changing the template for glib-mkenums from @filename@ to @basename@. Similarly to at-spi2-core this also changes a #include statement in the template, but the generated c file does not appear to be installed. The filename value would have pointed to a non-existent temp file, so this change could not have any more of a detrimental effect after installation that keeping the temp filename in it.
This was fixed upstream as part of https://gitlab.gnome.org/GNOME/json-glib/merge_requests/3 and got backported to 1.4.4; so for json-glib we are all good since September with the 1.4.4 bump in main tree
