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Re: [wg14/wg21 liaison] [SC22WG14.20330] Tracking C ABIs and ABI issues

From: David Keaton <dmk_at_[hidden]>
Date: Thu, 2 Sep 2021 12:34:02 -0700
      This would be appropriate material for a TR. However, an
International Standard is another valid choice because that would allow
us to request that it be made available for free. It would basically be
a catalog of standards, which is one of the few categories they actually
approve for free availability.


On 9/2/21 11:57 AM, Joseph Myers wrote:
> To expand on something I mentioned in the atomics discussion in today's
> WG14 meeting:
> When new ABI-relevant features have been added to C, the community of
> people involved in C implementations hasn't always done well at updating
> relevant ABIs to achieve consistency between implementations for those new
> features (where those implementations aim to allow mixing code built with
> different implementations for the same architecture/OS - this isn't
> relevant for all C implementations). Atomics are just one example where
> the ABI issues are more complicated than usual, and where actual
> incompatibilities have arisen between implementations as well as between C
> and C++.
> Should there be some maintained public list of C-relevant ABI documents
> (mainly, not entirely, psABI documents for various architectures), and of
> where they are maintained (if they are) / who the maintainer contacts are?
> What about lists of ABI-relevant new features in different C versions that
> ABIs may need to be updated for (and, for that matter, common extensions
> it may be helpful to consider in ABIs), or some mailing list or other
> location to help psABI maintainers (and other relevant ABI maintainers -
> for example, new features often need to be handled by debug info formats
> such as DWARF as well) track new features they need to pay attention to?
> Or guidance on issues to consider when writing a psABI document? Do such
> lists already exist somewhere?
> As an example of the sort of thing I might hope to find in such a list of
> ABI documents / contacts:
> * x86-64:
> PDFs https://gitlab.com/x86-psABIs/x86-64-ABI/-/wikis/x86-64-psABI
> repository https://gitlab.com/x86-psABIs/x86-64-ABI
> mailing list https://groups.google.com/g/x86-64-abi
> * i386:
> PDFs https://gitlab.com/x86-psABIs/i386-ABI/-/wikis/Intel386-psABI
> repository https://gitlab.com/x86-psABIs/i386-ABI/-/tree/hjl/x86/master
> mailing list https://groups.google.com/g/ia32-abi
> * Arm and AArch64:
> PDFs https://github.com/ARM-software/abi-aa/releases
> repository https://github.com/ARM-software/abi-aa
> * RISC-V:
> PDFs https://github.com/riscv/riscv-elf-psabi-doc/releases
> repository https://github.com/riscv/riscv-elf-psabi-doc
> (but hopefully covering more architectures than that).

Received on 2021-09-02 14:34:11