[Bug math/30909] New: aarch64: using intrinsic vector types in math-vector.h breaks C-parsing tools

[Bug math/30909] New: aarch64: using intrinsic vector types in math-vector.h breaks C-parsing tools

[simon.chopin at canonical dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30909

            Bug ID: 30909
           Summary: aarch64: using intrinsic vector types in math-vector.h
                    breaks C-parsing tools
           Product: glibc
           Version: 2.38
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: simon.chopin at canonical dot com
  Target Milestone: ---

The use of vector types such as __Float32x4_t in the aarch64 math-vector.h
header breaks quite a few programs that are essentially parsing C code but
using GCC as their preprocessor. GCC expands to the paths using its own
intrinsic types, which aren't implemented by the consuming programs.

I'm not sure if this qualifies as a bug in glibc, as it seems reasonable to
rely on those types, but we've seen this happen in quite a few instances in
Ubuntu:

https://bugs.launchpad.net/ubuntu/+source/mumax3/+bug/2032624

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[Bug math/30909] aarch64: using intrinsic vector types in math-vector.h breaks C-parsing tools

[simon.chopin at canonical dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30909

--- Comment #1 from Simon Chopin <simon.chopin at canonical dot com> ---
I posted a tentative patch adding a way to work around those types at
https://sourceware.org/pipermail/libc-alpha/2023-September/151770.html

I'll ship it in my next Ubuntu upload for Mantic as a way to unblock us due to
our fairly tight schedule, but I'm hoping we can come up with a better
long-term solution.

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[Bug math/30909] aarch64: using intrinsic vector types in math-vector.h breaks C-parsing tools

[connor.baker at tweag dot io]

https://sourceware.org/bugzilla/show_bug.cgi?id=30909

Connor Baker <connor.baker at tweag dot io> changed:

           What    |Removed                     |Added
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                 CC|                            |connor.baker at tweag dot io

--- Comment #2 from Connor Baker <connor.baker at tweag dot io> ---
Adding some additional context:

We're running into this issue in Nixpkgs:
https://github.com/NixOS/nixpkgs/pull/264599#pullrequestreview-1707381631.

The GLIBC 2.38 update introduces intrinsics for `aarch64-linux` in `math.h`.

NVCC (NVIDIA's CUDA Compiler) declares itself to be the same compiler as its
host compiler. This causes inclusion of unsupported `aarch64-linux` intrinsics.
NVCC is now unable to compile any CUDA file for `aarch64-linux` because it does
not support these intrinsics:
https://forums.developer.nvidia.com/t/nvcc-fails-to-build-with-arm-neon-instructions-cpp-vs-cu/248355/2.

I'll be submitting the same patch I've made for Nixpkgs.

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[Bug math/30909] aarch64: using intrinsic vector types in math-vector.h breaks C-parsing tools

[aurelien at aurel32 dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=30909

Aurelien Jarno <aurelien at aurel32 dot net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |aurelien at aurel32 dot net

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