Update configure for RISC-V support

Author: StanFromIreland

Misc/NEWS.d/next/Build/2026-08-23-12-10-45.gh-issue-156244.Rv6qXt.rst

@@ -0,0 +1,2 @@
+Update :program:`configure` for the ``riscv64-unknown-linux-gnu`` target triple,
+which is now a :pep:`11` tier 3 supported platform.

configure

@@ -1269,6 +1269,8 @@ AS_CASE([$host/$ac_cv_cc_name],
   [aarch64-pc-windows-msvc/msvc],        [PY_SUPPORT_TIER=3], dnl Windows ARM64, MSVC
   [armv7l-*-linux-gnueabihf/gcc],        [PY_SUPPORT_TIER=3], dnl ARMv7 LE with hardware floats, any vendor, glibc, gcc
   [powerpc64le-*-linux-gnu/clang],       [PY_SUPPORT_TIER=3], dnl Linux on PPC64 little endian, glibc, clang
+  [riscv64-*-linux-gnu/gcc],             [PY_SUPPORT_TIER=3], dnl Linux on RISC-V 64bit, glibc, gcc+clang
+  [riscv64-*-linux-gnu/clang],           [PY_SUPPORT_TIER=3],
   [s390x-*-linux-gnu/gcc],               [PY_SUPPORT_TIER=3], dnl Linux on 64bit s390x (big endian), glibc, gcc
   [x86_64-*-freebsd*/clang],             [PY_SUPPORT_TIER=3], dnl FreeBSD on AMD64
   [aarch64-apple-ios*-simulator/clang],  [PY_SUPPORT_TIER=3], dnl iOS Simulator on arm64