posixmodule.c: Define necessary headers for compiling on MINGW

Also, build `nt` module instead of `posix` when compiling
with MINGW.

Co-authored-by: Naveen M K <[email protected]>
Co-authored-by: Алексей <[email protected]>

Modules/Setup.bootstrap.in

@@ -8,7 +8,7 @@
 # module C APIs are used in core
 atexit atexitmodule.c
 faulthandler faulthandler.c
-posix posixmodule.c
+@INITSYS@ posixmodule.c
 _signal signalmodule.c
 _tracemalloc _tracemalloc.c
 

Modules/posixmodule.c

@@ -350,6 +350,26 @@ corresponding Unix manual entries for more information on calls.");
 #    define HAVE_CWAIT      1
 #    define HAVE_FSYNC      1
 #    define fsync _commit
+#  elif defined(__MINGW32__)	/* GCC for windows hosts */
+/* getlogin is detected by configure on mingw-w64 */
+#    undef HAVE_GETLOGIN
+/*#    define HAVE_GETCWD     1 - detected by configure*/
+#    define HAVE_GETPPID    1
+#    define HAVE_GETLOGIN   1
+#    define HAVE_SPAWNV     1
+#    define HAVE_WSPAWNV    1
+#    define HAVE_WEXECV     1
+/*#    define HAVE_EXECV	     1 - detected by configure*/
+#    define HAVE_PIPE	     1
+#    define HAVE_POPEN	     1
+#    define HAVE_SYSTEM	   1
+#    define HAVE_CWAIT      1
+#    define HAVE_FSYNC      1
+#    define fsync _commit
+#    include <winioctl.h>
+#    ifndef _MAX_ENV
+#      define _MAX_ENV	32767
+#    endif
 #  endif  /* _MSC_VER */
 #endif  /* ! __WATCOMC__ || __QNX__ */
 
@@ -428,7 +448,7 @@ extern char        *ctermid_r(char *);
 #  endif
 #endif
 
-#ifdef _MSC_VER
+#ifdef MS_WINDOWS
 #  ifdef HAVE_DIRECT_H
 #    include <direct.h>
 #  endif
@@ -439,7 +459,7 @@ extern char        *ctermid_r(char *);
 #    include <process.h>
 #  endif
 #  include <malloc.h>
-#endif /* _MSC_VER */
+#endif /* MS_WINDOWS */
 
 #ifndef MAXPATHLEN
 #  if defined(PATH_MAX) && PATH_MAX > 1024
@@ -1593,9 +1613,9 @@ win32_get_reparse_tag(HANDLE reparse_point_handle, ULONG *reparse_tag)
 ** man environ(7).
 */
 #include <crt_externs.h>
-#elif !defined(_MSC_VER) && (!defined(__WATCOMC__) || defined(__QNX__) || defined(__VXWORKS__))
+#elif !defined(MS_WINDOWS) && (!defined(__WATCOMC__) || defined(__QNX__) || defined(__VXWORKS__))
 extern char **environ;
-#endif /* !_MSC_VER */
+#endif /* !MS_WINDOWS */
 
 static PyObject *
 convertenviron(void)

configure.ac

@@ -738,6 +738,14 @@ then
   AC_DEFINE(_INCLUDE__STDC_A1_SOURCE, 1, Define to include mbstate_t for mbrtowc)
 fi
 
+AC_MSG_CHECKING([for init system calls])
+AC_SUBST(INITSYS)
+case $host in
+  *-*-mingw*)	INITSYS=nt;;
+  *)		INITSYS=posix;;
+esac
+AC_MSG_RESULT([$INITSYS])
+
 # Record the configure-time value of MACOSX_DEPLOYMENT_TARGET,
 # it may influence the way we can build extensions, so distutils
 # needs to check it