[PATCH] D85802: [clang] Add -fc++-abi= flag for specifying which C++ ABI to use

[Roland McGrath via Phabricator via cfe-commits]

mcgrathr added a comment.

In D85802#3876106 <https://reviews.llvm.org/D85802#3876106>, @dblaikie wrote:

>> The C++ ABI is not part of the Fuchsia system ABI, nor what we call the "Fuchsia compiler ABI". Different users of C++ are free to use whatever C++ ABI they like. Only the backend ABI independent of language-specific issues is necessary to interoperate with other code on Fuchsia.
>
> Sure enough - but I'm still sort of confused by why the Fuschia Clang target/compiler needs more than one C++ ABI. What is it interoperating with? (GCC doesn't have a Fuschia target implemented, does it? So what's it mean to target the GCC C++ ABI? what is compiling the code that Fuschia is trying to interoperate with when Clang targets Fuschia with a non-default C++ ABI?)

When we use GCC we're using the generic ELF targets. I think it's sufficient for us to tell you that indeed we do want the option of multiple C++ ABIs to select from without justifying everything about our work to a Clang reviewer before we can proceed with meeting the requirements of our system.


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https://reviews.llvm.org/D85802