gh-95853: Add script to automate WASM build (GH-95828)

Automate WASM build with a new Python script. The script provides
several build profiles with configure flags for Emscripten flavors
and WASI. The script can detect and use Emscripten SDK and WASI SDK from
default locations or env vars.

``configure`` now detects Node arguments and creates HOSTRUNNER
arguments for Node 16. It also sets correct arguments for
``wasm64-emscripten``.

Co-authored-by: Brett Cannon <brett@python.org>

1 files changed, 161 insertions, 5 deletions

diff --git a/configure b/configure
index 3f25d43..82b55a3 100755
--- a/configure
+++ b/configure
@@ -906,6 +906,7 @@ AR
 LINK_PYTHON_OBJS
 LINK_PYTHON_DEPS
 LIBRARY_DEPS
+NODE
 HOSTRUNNER
 STATIC_LIBPYTHON
 GNULD
@@ -4079,6 +4080,16 @@ if test -z "$CFLAGS"; then
         CFLAGS=
 fi
 
+case $host in #(
+  wasm64-*-emscripten) :
+
+    as_fn_append CFLAGS " -sMEMORY64=1"
+    as_fn_append LDFLAGS " -sMEMORY64=1"
+   ;; #(
+  *) :
+     ;;
+esac
+
 if test "$ac_sys_system" = "Darwin"
 then
     # Extract the first word of "xcrun", so it can be a program name with args.
@@ -6220,7 +6231,7 @@ cat > conftest.c <<EOF
 #    error unknown wasm32 platform
 #  endif
 #elif defined(__wasm64__)
-#  if defined(__EMSCRIPTEN)
+#  if defined(__EMSCRIPTEN__)
 	wasm64-emscripten
 #  elif defined(__wasi__)
 	wasm64-wasi
@@ -6840,20 +6851,163 @@ if test "$cross_compiling" = yes; then
 fi
 
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking HOSTRUNNER" >&5
-$as_echo_n "checking HOSTRUNNER... " >&6; }
 if test -z "$HOSTRUNNER"
 then
   case $ac_sys_system/$ac_sys_emscripten_target in #(
   Emscripten/node*) :
 
+      if test -n "$ac_tool_prefix"; then
+  # Extract the first word of "${ac_tool_prefix}node", so it can be a program name with args.
+set dummy ${ac_tool_prefix}node; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NODE+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NODE in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NODE="$NODE" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NODE="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NODE=$ac_cv_path_NODE
+if test -n "$NODE"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NODE" >&5
+$as_echo "$NODE" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+fi
+if test -z "$ac_cv_path_NODE"; then
+  ac_pt_NODE=$NODE
+  # Extract the first word of "node", so it can be a program name with args.
+set dummy node; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_ac_pt_NODE+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $ac_pt_NODE in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_ac_pt_NODE="$ac_pt_NODE" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_ac_pt_NODE="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+ac_pt_NODE=$ac_cv_path_ac_pt_NODE
+if test -n "$ac_pt_NODE"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_pt_NODE" >&5
+$as_echo "$ac_pt_NODE" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+  if test "x$ac_pt_NODE" = x; then
+    NODE="node"
+  else
+    case $cross_compiling:$ac_tool_warned in
+yes:)
+{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not prefixed with host triplet" >&5
+$as_echo "$as_me: WARNING: using cross tools not prefixed with host triplet" >&2;}
+ac_tool_warned=yes ;;
+esac
+    NODE=$ac_pt_NODE
+  fi
+else
+  NODE="$ac_cv_path_NODE"
+fi
+
+      HOSTRUNNER="$NODE"
       # bigint for ctypes c_longlong, c_longdouble
-      HOSTRUNNER="node --experimental-wasm-bigint"
+      # no longer available in Node 16
+      { $as_echo "$as_me:${as_lineno-$LINENO}: checking for node --experimental-wasm-bigint" >&5
+$as_echo_n "checking for node --experimental-wasm-bigint... " >&6; }
+if ${ac_cv_tool_node_wasm_bigint+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+
+        if $NODE -v --experimental-wasm-bigint > /dev/null 2>&1; then
+          ac_cv_tool_node_wasm_bigint=yes
+        else
+          ac_cv_tool_node_wasm_bigint=no
+        fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_tool_node_wasm_bigint" >&5
+$as_echo "$ac_cv_tool_node_wasm_bigint" >&6; }
+      if test "x$ac_cv_tool_node_wasm_bigint" = xyes; then :
+
+        as_fn_append HOSTRUNNER " --experimental-wasm-bigint"
+
+fi
+
       if test "x$enable_wasm_pthreads" = xyes; then :
 
-        HOSTRUNNER="$HOSTRUNNER --experimental-wasm-threads --experimental-wasm-bulk-memory"
+        as_fn_append HOSTRUNNER " --experimental-wasm-threads"
+        # no longer available in Node 16
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for node --experimental-wasm-bulk-memory" >&5
+$as_echo_n "checking for node --experimental-wasm-bulk-memory... " >&6; }
+if ${ac_cv_tool_node_wasm_bulk_memory+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+
+          if $NODE -v --experimental-wasm-bulk-memory > /dev/null 2>&1; then
+            ac_cv_tool_node_wasm_bulk_memory=yes
+          else
+            ac_cv_tool_node_wasm_bulk_memory=no
+          fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_tool_node_wasm_bulk_memory" >&5
+$as_echo "$ac_cv_tool_node_wasm_bulk_memory" >&6; }
+        if test "x$ac_cv_tool_node_wasm_bulk_memory" = xyes; then :
+
+          as_fn_append HOSTRUNNER " --experimental-wasm-bulk-memory"
 
 fi
+
+fi
+
+      if test "x$host_cpu" = xwasm64; then :
+  as_fn_append HOSTRUNNER " --experimental-wasm-memory64"
+fi
      ;; #(
               WASI/*) :
     HOSTRUNNER='wasmtime run --env PYTHONPATH=/$(shell realpath --relative-to $(abs_srcdir) $(abs_builddir))/$(shell cat pybuilddir.txt):/Lib --mapdir /::$(srcdir) --' ;; #(
@@ -6863,6 +7017,8 @@ fi
 esac
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking HOSTRUNNER" >&5
+$as_echo_n "checking HOSTRUNNER... " >&6; }
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $HOSTRUNNER" >&5
 $as_echo "$HOSTRUNNER" >&6; }