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Not just API compatibility. To maintain ABI compatibility as well, at this point they are working with a fork of a really old gcc version that still implements this particular C++ ABI[1].

[1] https://en.wikipedia.org/wiki/Haiku_(operating_system)#Compa...

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That's only on the 32 bit version, and even there they also use GCC 8.

Is that a "recent" development? I remembered that from a few years back when I played around with Haiku in a VM, tried to port some programs and poked around in the kernel source out of curiosity.

It would explain, why I couldn't find that "how to build the toolchain" page anymore through some quick browsing and posted the Wikipedia reference instead. I guess somebody(TM) should update the Wikipedia page then.

I'm not actually sure how recent this is. Clicking through the Wayback Machine for their FAQ (http://web.archive.org/web/20150813135145/https://www.haiku-...), it looks like they've shipped the 32-bit versions with both GCC 2 and a newer version since at least 2015, starting with GCC 4 and getting newer as the years passed.

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