RFR: 8341880: RISC-V: riscv_vector.h native build fails with gcc13 after JDK-8320500

[Hamlin Li]

On Thu, 10 Oct 2024 13:15:42 GMT, Fei Yang <fyang at openjdk.org> wrote:

> FYI: I witnessed some different kinds of compile errors about libsleef while building with GCC version 13.2.0 (Ubuntu 13.2.0-23ubuntu4) shipped with Ubuntu 24.04.1 LTS riscv64. Seems that GCC-13 doesn't have a good support for these RVV intrinsics as it does not recognize quite a few of them. If libsleef claims GCC-14+, maybe it's more reasonable to simply check the GCC version instead requiring 14+ when configuring openjdk?

>From https://github.com/shibatch/sleef, it state clearly that gcc 14+ is required, I think we should be fine to check gcc version.

For llvm, there is no version requirement stated in the page, it could still require a little `test` program to tell whether rvv intrinsicv are really supported or not (If `__riscv_v_intrinsic` can not be used as a test macro for that purpose like gcc(e.g. gcc-13) ).

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PR Comment: https://git.openjdk.org/jdk/pull/21442#issuecomment-2405168811