- Issue #14330: For cross builds, don't use host python, use host search paths

  for host compiler.

  Add NEWS entry, rename _PROJECT_BASE to _PYTHON_PROJECT_BASE.

Lib/sysconfig.py

@@ -139,8 +139,8 @@ if os.name == "nt" and "\\pcbuild\\amd64" in _PROJECT_BASE[-14:].lower():
     _PROJECT_BASE = _safe_realpath(os.path.join(_PROJECT_BASE, pardir, pardir))
 
 # set for cross builds
-if "_PROJECT_BASE" in os.environ:
-    _PROJECT_BASE = _safe_realpath(os.environ["_PROJECT_BASE"])
+if "_PYTHON_PROJECT_BASE" in os.environ:
+    _PROJECT_BASE = _safe_realpath(os.environ["_PYTHON_PROJECT_BASE"])
 
 def _is_python_source_dir(d):
     for fn in ("Setup.dist", "Setup.local"):

Misc/NEWS

@@ -42,6 +42,13 @@ Tools/Demos
     * C frames that are garbage-collecting
     * C frames that are due to the invocation of a PyCFunction
 
+Build
+-----
+
+- Issue #14330: For cross builds, don't use host python, use host search paths
+  for host compiler.
+
+
 What's New in Python 3.3.0 Beta 1?
 ==================================
 

configure

@@ -2898,7 +2898,7 @@ $as_echo_n "checking for python interpreter for cross build... " >&6; }
 	fi
         { $as_echo "$as_me:${as_lineno-$LINENO}: result: $interp" >&5
 $as_echo "$interp" >&6; }
-	PYTHON_FOR_BUILD="_PROJECT_BASE=$srcdir"' _PYTHON_HOST_PLATFORM=$(_PYTHON_HOST_PLATFORM) PYTHONPATH=$(srcdir)/Lib:$(srcdir)/Lib/plat-$(MACHDEP) '$interp
+	PYTHON_FOR_BUILD="_PYTHON_PROJECT_BASE=$srcdir"' _PYTHON_HOST_PLATFORM=$(_PYTHON_HOST_PLATFORM) PYTHONPATH=$(srcdir)/Lib:$(srcdir)/Lib/plat-$(MACHDEP) '$interp
     fi
 else
     PYTHON_FOR_BUILD='./$(BUILDPYTHON) -E'

configure.ac

@@ -49,7 +49,7 @@ if test "$cross_compiling" = yes; then
 	    AC_MSG_ERROR([python$PACKAGE_VERSION interpreter not found])
 	fi
         AC_MSG_RESULT($interp)
-	PYTHON_FOR_BUILD="_PROJECT_BASE=$srcdir"' _PYTHON_HOST_PLATFORM=$(_PYTHON_HOST_PLATFORM) PYTHONPATH=$(srcdir)/Lib:$(srcdir)/Lib/plat-$(MACHDEP) '$interp
+	PYTHON_FOR_BUILD="_PYTHON_PROJECT_BASE=$srcdir"' _PYTHON_HOST_PLATFORM=$(_PYTHON_HOST_PLATFORM) PYTHONPATH=$(srcdir)/Lib:$(srcdir)/Lib/plat-$(MACHDEP) '$interp
     fi
 else
     PYTHON_FOR_BUILD='./$(BUILDPYTHON) -E'