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Currently, when the argument of copyObject() is const-qualified, the
return type is also, because the use of typeof carries over all the
qualifiers. This is incorrect, since the point of copyObject() is to
make a copy to mutate. But apparently no code ran into it.
The new implementation uses typeof_unqual, which drops the qualifiers,
making this work correctly.
typeof_unqual is standardized in C23, but all recent versions of all
the usual compilers support it even in non-C23 mode, at least as
__typeof_unqual__. We add a configure/meson test for typeof_unqual
and __typeof_unqual__ and use it if it's available, else we use the
existing fallback of just returning void *.
This is the second attempt, after the first attempt in commit
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| ax_pthread.m4 | ||
| c-compiler.m4 | ||
| c-library.m4 | ||
| check_decls.m4 | ||
| check_modules.pl | ||
| config.guess | ||
| config.sub | ||
| general.m4 | ||
| install-sh | ||
| llvm.m4 | ||
| Makefile | ||
| meson.build | ||
| missing | ||
| perl.m4 | ||
| pkg.m4 | ||
| prep_buildtree | ||
| programs.m4 | ||
| python.m4 | ||
| tcl.m4 | ||