Add emstrip wrapper around llvm-strip (emscripten-core#16431)

Fixes: emscripten-core#16430

emstrip

@@ -0,0 +1,31 @@
+#!/bin/sh
+# Copyright 2020 The Emscripten Authors.  All rights reserved.
+# Emscripten is available under two separate licenses, the MIT license and the
+# University of Illinois/NCSA Open Source License.  Both these licenses can be
+# found in the LICENSE file.
+#
+# Entry point for running python scripts on UNIX systems.
+#
+# Automatically generated by `create_entry_points.py`; DO NOT EDIT.
+#
+# To make modifications to this file, edit `tools/run_python.sh` and then run
+# `tools/create_entry_points.py`
+
+if [ -z "$PYTHON" ]; then
+  PYTHON=$EMSDK_PYTHON
+fi
+
+if [ -z "$PYTHON" ]; then
+  PYTHON=$(command -v python3 2> /dev/null)
+fi
+
+if [ -z "$PYTHON" ]; then
+  PYTHON=$(command -v python 2> /dev/null)
+fi
+
+if [ -z "$PYTHON" ]; then
+  echo 'unable to find python in $PATH'
+  exit 1
+fi
+
+exec "$PYTHON" "$0.py" "$@"

emstrip.bat

@@ -0,0 +1,60 @@
+:: Entry point for running python scripts on windows systems.
+::
+:: Automatically generated by `create_entry_points.py`; DO NOT EDIT.
+::
+:: To make modifications to this file, edit `tools/run_python.bat` and then run
+:: `tools/create_entry_points.py`
+
+:: All env. vars specified in this file are to be local only to this script.
+@setlocal
+
+@set EM_PY=%EMSDK_PYTHON%
+@if "%EM_PY%"=="" (
+  set EM_PY=python
+)
+
+:: Python Windows bug https://bugs.python.org/issue34780: If this script was invoked via a
+:: shared stdin handle from the parent process, and that parent process stdin handle is in
+:: a certain state, running python.exe might hang here. To work around this, if
+:: EM_WORKAROUND_PYTHON_BUG_34780 is defined, invoke python with '< NUL' stdin to avoid
+:: sharing the parent's stdin handle to it, avoiding the hang.
+
+:: On Windows 7, the compiler batch scripts are observed to exit with a non-zero errorlevel,
+:: even when the python executable above did succeed and quit with errorlevel 0 above.
+:: On Windows 8 and newer, this issue has not been observed. It is possible that this
+:: issue is related to the above python bug, but this has not been conclusively confirmed,
+:: so using a separate env. var EM_WORKAROUND_WIN7_BAD_ERRORLEVEL_BUG to enable the known
+:: workaround this issue, which is to explicitly quit the calling process with the previous
+:: errorlevel from the above command.
+
+:: Also must use goto to jump to the command dispatch, since we cannot invoke emcc from
+:: inside a if() block, because if a cmdline param would contain a char '(' or ')', that
+:: would throw off the parsing of the cmdline arg.
+@if "%EM_WORKAROUND_PYTHON_BUG_34780%"=="" (
+  @if "%EM_WORKAROUND_WIN7_BAD_ERRORLEVEL_BUG%"=="" (
+    goto NORMAL
+  ) else (
+    goto NORMAL_EXIT
+  )
+) else (
+  @if "%EM_WORKAROUND_WIN7_BAD_ERRORLEVEL_BUG%"=="" (
+    goto MUTE_STDIN
+  ) else (
+    goto MUTE_STDIN_EXIT
+  )
+)
+
+:NORMAL_EXIT
+@"%EM_PY%" "%~dp0\%~n0.py" %*
+@exit %ERRORLEVEL%
+
+:MUTE_STDIN
+@"%EM_PY%" "%~dp0\%~n0.py" %* < NUL
+@exit /b %ERRORLEVEL%
+
+:MUTE_STDIN_EXIT
+@"%EM_PY%" "%~dp0\%~n0.py" %* < NUL
+@exit %ERRORLEVEL%
+
+:NORMAL
+@"%EM_PY%" "%~dp0\%~n0.py" %*

emstrip.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+# Copyright 2022 The Emscripten Authors.  All rights reserved.
+# Emscripten is available under two separate licenses, the MIT license and the
+# University of Illinois/NCSA Open Source License.  Both these licenses can be
+# found in the LICENSE file.
+
+"""Wrapper script around `llvm-strip`.
+"""
+
+import sys
+from tools import shared
+
+cmd = [shared.LLVM_STRIP] + sys.argv[1:]
+sys.exit(shared.run_process(cmd, stdin=sys.stdin, check=False).returncode)

tools/create_entry_points.py

@@ -37,6 +37,7 @@
 emprofile
 emdwp
 emnm
+emstrip
 tools/file_packager
 tools/webidl_binder
 tests/runner

tools/shared.py

@@ -702,6 +702,7 @@ def get_llvm_target():
 LLVM_COMPILER = os.path.expanduser(build_llvm_tool_path(exe_suffix('llc')))
 LLVM_DWARFDUMP = os.path.expanduser(build_llvm_tool_path(exe_suffix('llvm-dwarfdump')))
 LLVM_OBJCOPY = os.path.expanduser(build_llvm_tool_path(exe_suffix('llvm-objcopy')))
+LLVM_STRIP = os.path.expanduser(build_llvm_tool_path(exe_suffix('llvm-strip')))
 WASM_LD = os.path.expanduser(build_llvm_tool_path(exe_suffix('wasm-ld')))
 
 EMCC = bat_suffix(path_from_root('emcc'))