[PATCH] configure.ac: perform RISC-V vector crypto intrinsics bug checks without LTO

[Sam James]

Jussi Kivilinna <jussi.kivilinna at iki.fi> writes:

> * configure.ac (gcry_cv_riscv_vsha2cl_intrinsics_work)
> (gcry_cv_riscv_vaes_vs_intrinsics_work): Run check with '-fno-lto' compiler
> flag.


I assume this is because of https://gcc.gnu.org/PR110812? If so, a
comment referencing it would be nice.

> --
>
> Signed-off-by: Jussi Kivilinna <jussi.kivilinna at iki.fi>
> ---
>  configure.ac | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/configure.ac b/configure.ac
> index 80d38496..90c513be 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -2934,6 +2934,9 @@ if test "$gcry_cv_cc_riscv_vector_crypto_intrinsics" = "yes" ||
>      CFLAGS="$CFLAGS -O2 -march=$MARCH_RVA23U64_WITH_VEC_CRYPTO -mstrict-align"
>    fi
>  
> +  # Disable LTO optimization to generate target instructions
> +  CFLAGS="$CFLAGS -fno-lto"
> +
>    AC_CACHE_CHECK([whether compiler has working RISC-V __riscv_vsha2cl intrinsics],
>      [gcry_cv_riscv_vsha2cl_intrinsics_work],
>      [gcry_cv_riscv_vsha2cl_intrinsics_work=no
> @@ -2981,6 +2984,9 @@ if test "$gcry_cv_cc_riscv_vector_crypto_intrinsics" = "yes" ||
>      CFLAGS="$CFLAGS -O2"
>    fi
>  
> +  # Disable LTO optimization to generate target instructions
> +  CFLAGS="$CFLAGS -fno-lto"
> +
>    AC_CACHE_CHECK([whether compiler has working RISC-V __riscv_vaes*_vs intrinsics],
>      [gcry_cv_riscv_vaes_vs_intrinsics_work],
>      [gcry_cv_riscv_vaes_vs_intrinsics_work=no