GCC 11+ __attr_dealloc problems

[stephenrkell]

The prototype of reallocarray in the stdlib.h of at least some versions (Ubuntu?) of glibc 2.35 causes an interesting problem... the function is mentioned in its own __attr_dealloc attribute. The header breaks the reference cycle by prototyping the function twice: once with plain free declared as the dealloc function, and once then with reallocarray. This is not being merged correctly by CIL.

So really this is a CIL bug -- but my fork doesn't have its own issue tracker, and I don't want to report it upstream now that Gabriel has said he considers it unmaintained, so recording the bug here for now.

[stephenrkell]

The workaround is to use GCC 10 or earlier, because these attributes are disabled at this GNUC prereq level.