RFR: 8341880: RISC-V: riscv_vector.h native build fails with gcc13 after JDK-8320500 [v3]

[SendaoYan]

On Fri, 11 Oct 2024 07:57:48 GMT, SendaoYan <syan at openjdk.org> wrote:

>> Hi all,
>> The file `src/jdk.incubator.vector/linux/native/libsleef/lib/vector_math_rvv.c` introduced by [JDK-8341880](https://bugs.openjdk.org/browse/JDK-8341880) native build fails by fedora OS shipped gcc13.
>> Gcc13 doesn't have `__riscv_v_intrinsic` macro by default, and do have `__riscv_v_intrinsic` macro with option: `-march=rv64gcv`. libsleef only supported from llvm version 17 and gcc version 14 onwards, so we need to check the compiler version before use the `__riscv_v_intrinsic`.
>> 
>> ![image](https://github.com/user-attachments/assets/3bf8557d-d156-48a1-a762-44c1fa50a31c)
>> 
>> 
>> gcc version infomation:
>> 
>> /usr/bin/gcc -v
>> Using built-in specs.
>> COLLECT_GCC=/usr/bin/gcc
>> COLLECT_LTO_WRAPPER=/usr/libexec/gcc/riscv64-redhat-linux/13/lto-wrapper
>> Target: riscv64-redhat-linux
>> Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,m2,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --enable-libstdcxx-backtrace --with-libstdcxx-zoneinfo=/usr/share/zoneinfo --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl=/builddir/build/BUILD/gcc-13.2.1-20230728/obj-riscv64-redhat-linux/isl-install --enable-gnu-indirect-function --with-arch=rv64gc --with-abi=lp64d --with-multilib-list=lp64d --build=riscv64-redhat-linux --with-build-config=bootstrap-lto --enable-link-serialization=1
>> Thread model: posix
>> Supported LTO compression algorithms: zlib zstd
>> gcc version 13.2.1 20230728 (Red Hat 13.2.1-1) (GCC)
>> 
>> 
>> Additonal testing:
>> 
>> - [x] riscv64 native release debug-level build with gcc13
>> - [x] riscv64 native fastdebug debug-level build with gcc13
>> - [x] riscv64 native release debug-level build with gcc14
>> - [ ] riscv64 native fastdebug debug-level build with gcc14
>
> SendaoYan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add the tailing blank line and add a commnet for #endif

Thanks all for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/21442#issuecomment-2406817050