e25756cb62
Previous code would declare properties as `extern PropertyRNA`, but implement them as type-refined data (e.g. `FloatPropertyRNA`). This is fully illegal thing, it happened to work 'fine' so far for two main reasons: * C-linking does not do type-checks on extern data. * Code using these publicly exposed data would always use them as `PorpertyRNA *` pointers, and pass them to RNA API. However, this (finally !) breaks when trying to move generated `RNA_property.h` header to C++, since at least MSVC2022 does mangle the type in the extern'ed symbol name, which makes linking fails epically. This commit fixes the issue by only declaring `PointerRNA *` pointers in the headers. These pointers are then defined in each implementation file (the `rna_xxx_gen.cc` ones), and assinged to the address of a matching local static variable. These static variables are type-refined, and actually contain the property definition data. Pull Request: https://projects.blender.org/blender/blender/pulls/124603
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