parsers: backout version mismatch detection from 21dafd8546d1

parsers: backout version mismatch detection from 21dafd8546d1

This introduced mandatory recompilations and breaks pure mode in tests

--- a/mercurial/parsers.c	Sun Dec 01 14:10:53 2013 -0600
+++ b/mercurial/parsers.c	Sun Dec 01 20:46:36 2013 -0600
@@ -1941,25 +1941,6 @@
 	dirstate_unset = Py_BuildValue("ciii", 'n', 0, -1, -1);
 }
 
-static int check_python_version()
-{
-	PyObject *sys = PyImport_ImportModule("sys");
-	PyObject *hexversion = PyObject_GetAttrString(sys, "hexversion");
-	long version = PyInt_AsLong(hexversion);
-	/* sys.hexversion is a 32-bit number by default, so the -1 case
-	 * should only occur in unusual circumstances (e.g. if sys.hexversion
-	 * is manually set to an invalid value). */
-	if ((version == -1) || (version >> 16 != PY_VERSION_HEX >> 16)) {
-		PyErr_Format(PyExc_ImportError, "Python minor version mismatch: "
-			"The Mercurial extension modules were compiled with Python "
-			PY_VERSION ", but Mercurial is currently using Python with "
-			"sys.hexversion=%ld: Python %s\n at: %s", version,
-			Py_GetVersion(), Py_GetProgramFullPath());
-		return -1;
-	}
-	return 0;
-}
-
 #ifdef IS_PY3K
 static struct PyModuleDef parsers_module = {
 	PyModuleDef_HEAD_INIT,
@@ -1971,8 +1952,6 @@
 
 PyMODINIT_FUNC PyInit_parsers(void)
 {
-	if (check_python_version() == -1)
-		return;
 	PyObject *mod = PyModule_Create(&parsers_module);
 	module_init(mod);
 	return mod;
@@ -1980,8 +1959,6 @@
 #else
 PyMODINIT_FUNC initparsers(void)
 {
-	if (check_python_version() == -1)
-		return;
 	PyObject *mod = Py_InitModule3("parsers", methods, parsers_doc);
 	module_init(mod);
 }

--- a/tests/test-parseindex2.py	Sun Dec 01 14:10:53 2013 -0600
+++ b/tests/test-parseindex2.py	Sun Dec 01 20:46:36 2013 -0600
@@ -1,8 +1,6 @@
 from mercurial import parsers
 from mercurial.node import nullid, nullrev
 import struct
-import subprocess
-import sys
 
 # This unit test compares the return value of the original Python
 # implementation of parseindex and the new C implementation for
@@ -99,62 +97,7 @@
     index, chunkcache = parsers.parse_index2(data, inline)
     return list(index), chunkcache
 
-def importparsers(hexversion):
-    """Import mercurial.parsers with the given sys.hexversion."""
-    # The file parsers.c inspects sys.hexversion to determine the version
-    # of the currently-running Python interpreter, so we monkey-patch
-    # sys.hexversion to simulate using different versions.
-    code = ("import sys; sys.hexversion=%s; "
-            "import mercurial.parsers" % hexversion)
-    cmd = "python -c \"%s\"" % code
-    # We need to do these tests inside a subprocess because parser.c's
-    # version-checking code happens inside the module init function, and
-    # when using reload() to reimport an extension module, "The init function
-    # of extension modules is not called a second time"
-    # (from http://docs.python.org/2/library/functions.html?#reload).
-    p = subprocess.Popen(cmd, shell=True,
-                         stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
-    return p.communicate()  # returns stdout, stderr
-
-def printhexfail(testnumber, hexversion, msg):
-    try:
-        hexstring = hex(hexversion)
-    except TypeError:
-        hexstring = None
-    print ("%s) using Python %s and patched sys.hexversion %r (%r): %s" %
-           (testnumber, sys.version_info, hexversion, hexstring, msg))
-
-def testversionokay(testnumber, hexversion):
-    stdout, stderr = importparsers(hexversion)
-    if stdout:
-        printhexfail(testnumber, hexversion,
-                     "Expected no stdout but got: %r" % stdout)
-
-def testversionfail(testnumber, hexversion):
-    stdout, stderr = importparsers(hexversion)
-    if not "ImportError: Python minor version mismatch" in stdout:
-        printhexfail(testnumber, hexversion,
-                     "Expected stdout to contain %r but got: %r" %
-                     (errstring, stdout))
-
-def makehex(major, minor, micro):
-    return int("%x%02x%02x00" % (major, minor, micro), 16)
-
-def runversiontests():
-    """Test importing parsers using different Python versions."""
-    info = sys.version_info
-    major, minor, micro = info[0], info[1], info[2]
-    # Test same major-minor versions.
-    testversionokay(1, makehex(major, minor, micro))
-    testversionokay(2, makehex(major, minor, micro + 1))
-    # Test different major-minor versions.
-    testversionfail(3, makehex(major + 1, minor, micro))
-    testversionfail(4, makehex(major, minor + 1, micro))
-    testversionfail(5, "'foo'")
-
 def runtest() :
-    runversiontests()
-
     # Check that parse_index2() raises TypeError on bad arguments.
     try:
         parse_index2(0, True)