[3.11] GH-116313: get WASI builds to run under wasmtime 18 w/ WASI 0.…

…2/preview2 primitives (GH-116327) (GH-116373) (GH-116384)

(cherry picked from commit 88fdb08)

Misc/NEWS.d/next/Build/2024-03-04-12-43-42.gh-issue-116313.cLLb8S.rst

@@ -0,0 +1 @@
+Get WASI builds to work under wasmtime 18 w/ WASI 0.2/preview2 primitives.

Tools/wasm/wasm_build.py

@@ -316,8 +316,10 @@ def _check_wasi():
         # workaround for https://github.com/python/cpython/issues/95952
         "HOSTRUNNER": (
             "wasmtime run "
-            "--env PYTHONPATH=/{relbuilddir}/build/lib.wasi-wasm32-{version}:/Lib "
-            "--mapdir /::{srcdir} --"
+            "--wasm max-wasm-stack=8388608 "
+            "--wasi preview2 "
+            "--dir {srcdir}::/ "
+            "--env PYTHONPATH=/{relbuilddir}/build/lib.wasi-wasm32-{version}:/Lib"
         ),
         "PATH": [WASI_SDK_PATH / "bin", os.environ["PATH"]],
     },

configure.ac

@@ -1580,7 +1580,7 @@ then
     dnl TODO: support other WASI runtimes
     dnl wasmtime starts the proces with "/" as CWD. For OOT builds add the
     dnl directory containing _sysconfigdata to PYTHONPATH.
-    [WASI/*], [HOSTRUNNER='wasmtime run --env PYTHONPATH=/$(shell realpath --relative-to $(abs_srcdir) $(abs_builddir))/$(shell cat pybuilddir.txt) --mapdir /::$(srcdir) --'],
+    [WASI/*], [HOSTRUNNER='wasmtime run --wasm max-wasm-stack=8388608 --wasi preview2 --env PYTHONPATH=/$(shell realpath --relative-to $(abs_srcdir) $(abs_builddir))/$(shell cat pybuilddir.txt):/Lib --dir $(srcdir)::/'],
     [HOSTRUNNER='']
   )
 fi