Fix #14470. Remove w9xpopen per PEP 11.

As stated in PEP 11, 3.4 removes code on Windows platforms where
COMSPEC points to command.com. The w9xpopen project in Visual Studio
was added to support that case, and there was a special case in subprocess
to cover that situation. This change removes the w9xpopen project from
the Visual Studio solution and removes any references to the w9xpopen
executable.

Lib/subprocess.py

@@ -1029,23 +1029,6 @@ class Popen(object):
             return Handle(h)
 
 
-        def _find_w9xpopen(self):
-            """Find and return absolut path to w9xpopen.exe"""
-            w9xpopen = os.path.join(
-                            os.path.dirname(_winapi.GetModuleFileName(0)),
-                                    "w9xpopen.exe")
-            if not os.path.exists(w9xpopen):
-                # Eeek - file-not-found - possibly an embedding
-                # situation - see if we can locate it in sys.exec_prefix
-                w9xpopen = os.path.join(os.path.dirname(sys.base_exec_prefix),
-                                        "w9xpopen.exe")
-                if not os.path.exists(w9xpopen):
-                    raise SubprocessError(
-                            "Cannot locate w9xpopen.exe, which is needed for "
-                            "Popen to work with your shell or platform.")
-            return w9xpopen
-
-
         def _execute_child(self, args, executable, preexec_fn, close_fds,
                            pass_fds, cwd, env,
                            startupinfo, creationflags, shell,
@@ -1074,21 +1057,6 @@ class Popen(object):
                 startupinfo.wShowWindow = _winapi.SW_HIDE
                 comspec = os.environ.get("COMSPEC", "cmd.exe")
                 args = '{} /c "{}"'.format (comspec, args)
-                if (_winapi.GetVersion() >= 0x80000000 or
-                        os.path.basename(comspec).lower() == "command.com"):
-                    # Win9x, or using command.com on NT. We need to
-                    # use the w9xpopen intermediate program. For more
-                    # information, see KB Q150956
-                    # (http://web.archive.org/web/20011105084002/http://support.microsoft.com/support/kb/articles/Q150/9/56.asp)
-                    w9xpopen = self._find_w9xpopen()
-                    args = '"%s" %s' % (w9xpopen, args)
-                    # Not passing CREATE_NEW_CONSOLE has been known to
-                    # cause random failures on win9x.  Specifically a
-                    # dialog: "Your program accessed mem currently in
-                    # use at xxx" and a hopeful warning about the
-                    # stability of your system.  Cost is Ctrl+C won't
-                    # kill children.
-                    creationflags |= _winapi.CREATE_NEW_CONSOLE
 
             # Start the process
             try:

PC/w9xpopen.c

-/*
- * w9xpopen.c
- *
- * Serves as an intermediate stub Win32 console application to
- * avoid a hanging pipe when redirecting 16-bit console based
- * programs (including MS-DOS console based programs and batch
- * files) on Window 95 and Windows 98.
- *
- * This program is to be launched with redirected standard
- * handles. It will launch the command line specified 16-bit
- * console based application in the same console, forwarding
- * its own redirected standard handles to the 16-bit child.
-
- * AKA solution to the problem described in KB: Q150956.
- */    
-
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-#include <stdio.h>
-#include <stdlib.h>  /* for malloc and its friends */
-
-const char *usage =
-"This program is used by Python's os.popen function\n"
-"to work around a limitation in Windows 95/98.  It is\n"
-"not designed to be used as a stand-alone program.";
-
-int main(int argc, char *argv[])
-{
-    BOOL bRet;
-    STARTUPINFO si;
-    PROCESS_INFORMATION pi;
-    DWORD exit_code=0;
-    size_t cmdlen = 0;
-    int i;
-    char *cmdline, *cmdlinefill;
-
-    if (argc < 2) {
-        if (GetFileType(GetStdHandle(STD_INPUT_HANDLE))==FILE_TYPE_CHAR)
-            /* Attached to a console, and therefore not executed by Python
-               Display a message box for the inquisitive user
-            */
-            MessageBox(NULL, usage, argv[0], MB_OK);
-        else {
-            /* Eeek - executed by Python, but args are screwed!
-               Write an error message to stdout so there is at
-               least some clue for the end user when it appears
-               in their output.
-               A message box would be hidden and blocks the app.
-             */
-            fprintf(stdout, "Internal popen error - no args specified\n%s\n", usage);
-        }
-        return 1;
-    }
-    /* Build up the command-line from the args.
-       Args with a space are quoted, existing quotes are escaped.
-       To keep things simple calculating the buffer size, we assume
-       every character is a quote - ie, we allocate double what we need
-       in the worst case.  As this is only double the command line passed
-       to us, there is a good chance this is reasonably small, so the total 
-       allocation will almost always be < 512 bytes.
-    */
-    for (i=1;i<argc;i++)
-        cmdlen += strlen(argv[i])*2 + 3; /* one space, maybe 2 quotes */
-    cmdline = cmdlinefill = (char *)malloc(cmdlen+1);
-    if (cmdline == NULL)
-        return -1;
-    for (i=1;i<argc;i++) {
-        const char *arglook;
-        int bQuote = strchr(argv[i], ' ') != NULL;
-        if (bQuote)
-            *cmdlinefill++ = '"';
-        /* escape quotes */
-        for (arglook=argv[i];*arglook;arglook++) {
-            if (*arglook=='"')
-                *cmdlinefill++ = '\\';
-            *cmdlinefill++ = *arglook;
-        }
-        if (bQuote)
-            *cmdlinefill++ = '"';
-        *cmdlinefill++ = ' ';
-    }
-    *cmdlinefill = '\0';
-
-    /* Make child process use this app's standard files. */
-    ZeroMemory(&si, sizeof si);
-    si.cb = sizeof si;
-    si.dwFlags = STARTF_USESTDHANDLES;
-    si.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
-    si.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
-    si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
-
-    bRet = CreateProcess(
-        NULL, cmdline,
-        NULL, NULL,
-        TRUE, 0,
-        NULL, NULL,
-        &si, &pi
-        );
-
-    free(cmdline);
-
-    if (bRet) {
-        if (WaitForSingleObject(pi.hProcess, INFINITE) != WAIT_FAILED) {
-	    GetExitCodeProcess(pi.hProcess, &exit_code);
-	}
-        CloseHandle(pi.hProcess);
-        CloseHandle(pi.hThread);
-        return exit_code;
-    }
-
-    return 1;
-}

PCbuild/pcbuild.sln

@@ -14,8 +14,6 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pythoncore", "pythoncore.vc
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pythonw", "pythonw.vcxproj", "{F4229CC3-873C-49AE-9729-DD308ED4CD4A}"
 EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "w9xpopen", "w9xpopen.vcxproj", "{E9E0A1F6-0009-4E8C-B8F8-1B8F5D49A058}"
-EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "make_buildinfo", "make_buildinfo.vcxproj", "{C73F0EC1-358B-4177-940F-0846AC8B04CD}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "winsound", "winsound.vcxproj", "{28B5D777-DDF2-4B6B-B34F-31D938813856}"

PCbuild/python.vcxproj

@@ -357,12 +357,8 @@
       <Project>{cf7ac3d1-e2df-41d2-bea6-1e2556cdea26}</Project>
       <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
     </ProjectReference>
-    <ProjectReference Include="w9xpopen.vcxproj">
-      <Project>{e9e0a1f6-0009-4e8c-b8f8-1b8f5d49a058}</Project>
-      <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
-    </ProjectReference>
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
\ No newline at end of file
+</Project>

PCbuild/w9xpopen.vcxproj

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-    <ProjectConfiguration Include="Debug|Win32">
-      <Configuration>Debug</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Debug|x64">
-      <Configuration>Debug</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="PGInstrument|Win32">
-      <Configuration>PGInstrument</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="PGInstrument|x64">
-      <Configuration>PGInstrument</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="PGUpdate|Win32">
-      <Configuration>PGUpdate</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="PGUpdate|x64">
-      <Configuration>PGUpdate</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|Win32">
-      <Configuration>Release</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|x64">
-      <Configuration>Release</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
-  </ItemGroup>
-  <PropertyGroup Label="Globals">
-    <ProjectGuid>{E9E0A1F6-0009-4E8C-B8F8-1B8F5D49A058}</ProjectGuid>
-    <RootNamespace>w9xpopen</RootNamespace>
-  </PropertyGroup>
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='PGUpdate|Win32'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>MultiByte</CharacterSet>
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-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
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-    <CharacterSet>NotSet</CharacterSet>
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-      <ImportLibrary>
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\ No newline at end of file

PCbuild/w9xpopen.vcxproj.filters

-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <ItemGroup>
-    <Filter Include="Source Files">
-      <UniqueIdentifier>{abc2dffd-3f2a-47bd-b89b-0314c99ef21e}</UniqueIdentifier>
-    </Filter>
-  </ItemGroup>
-  <ItemGroup>
-    <ClCompile Include="..\PC\w9xpopen.c">
-      <Filter>Source Files</Filter>
-    </ClCompile>
-  </ItemGroup>
-</Project>
\ No newline at end of file

Tools/msi/msi.py

@@ -956,8 +956,6 @@ def add_files(db):
     # Add all executables, icons, text files into the TARGETDIR component
     root = PyDirectory(db, cab, None, srcdir, "TARGETDIR", "SourceDir")
     default_feature.set_current()
-    if not msilib.Win64:
-        root.add_file("%s/w9xpopen.exe" % PCBUILD)
     root.add_file("README.txt", src="README")
     root.add_file("NEWS.txt", src="Misc/NEWS")
     generate_license()