From 343e2ff51b8640238dbf3109494a64e6b50f1901 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tarek=20Ziad=C3=A9?= <ziade.tarek@gmail.com>
Date: Mon, 11 Jan 2010 23:23:44 +0000
Subject: [PATCH] Merged revisions 77427 via svnmerge from
 svn+ssh://pythondev@svn.python.org/python/branches/py3k

................
  r77427 | tarek.ziade | 2010-01-12 00:15:52 +0100 (Tue, 12 Jan 2010) | 9 lines

  Merged revisions 77424 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

  ........
    r77424 | tarek.ziade | 2010-01-11 23:50:29 +0100 (Mon, 11 Jan 2010) | 1 line

    Fixed #5372: .o files are now always rebuilt because file age test don't work in some case
  ........
................
---
 Lib/distutils/ccompiler.py | 82 +++-----------------------------------
 Misc/NEWS                  |  4 ++
 2 files changed, 9 insertions(+), 77 deletions(-)

diff --git a/Lib/distutils/ccompiler.py b/Lib/distutils/ccompiler.py
index 875f96fac39..34c77a37a31 100644
--- a/Lib/distutils/ccompiler.py
+++ b/Lib/distutils/ccompiler.py
@@ -311,10 +311,7 @@ class CCompiler:
 
     def _setup_compile(self, outdir, macros, incdirs, sources, depends,
                        extra):
-        """Process arguments and decide which source files to compile.
-
-        Merges _fix_compile_args() and _prep_compile().
-        """
+        """Process arguments and decide which source files to compile."""
         if outdir is None:
             outdir = self.output_dir
         elif not isinstance(outdir, str):
@@ -343,41 +340,6 @@ class CCompiler:
                                         output_dir=outdir)
         assert len(objects) == len(sources)
 
-        # XXX should redo this code to eliminate skip_source entirely.
-        # XXX instead create build and issue skip messages inline
-
-        if self.force:
-            skip_source = {}            # rebuild everything
-            for source in sources:
-                skip_source[source] = 0
-        elif depends is None:
-            # If depends is None, figure out which source files we
-            # have to recompile according to a simplistic check. We
-            # just compare the source and object file, no deep
-            # dependency checking involving header files.
-            skip_source = {}            # rebuild everything
-            for source in sources:      # no wait, rebuild nothing
-                skip_source[source] = 1
-
-            n_sources, n_objects = newer_pairwise(sources, objects)
-            for source in n_sources:    # no really, only rebuild what's
-                skip_source[source] = 0 # out-of-date
-        else:
-            # If depends is a list of files, then do a different
-            # simplistic check.  Assume that each object depends on
-            # its source and all files in the depends list.
-            skip_source = {}
-            # L contains all the depends plus a spot at the end for a
-            # particular source file
-            L = depends[:] + [None]
-            for i in range(len(objects)):
-                source = sources[i]
-                L[-1] = source
-                if newer_group(L, objects[i]):
-                    skip_source[source] = 0
-                else:
-                    skip_source[source] = 1
-
         pp_opts = gen_preprocess_options(macros, incdirs)
 
         build = {}
@@ -386,10 +348,7 @@ class CCompiler:
             obj = objects[i]
             ext = os.path.splitext(src)[1]
             self.mkpath(os.path.dirname(obj))
-            if skip_source[src]:
-                log.debug("skipping %s (%s up-to-date)", src, obj)
-            else:
-                build[obj] = src, ext
+            build[obj] = (src, ext)
 
         return macros, objects, extra, pp_opts, build
 
@@ -446,40 +405,9 @@ class CCompiler:
         objects = self.object_filenames(sources, output_dir=output_dir)
         assert len(objects) == len(sources)
 
-        if self.force:
-            skip_source = {}            # rebuild everything
-            for source in sources:
-                skip_source[source] = 0
-        elif depends is None:
-            # If depends is None, figure out which source files we
-            # have to recompile according to a simplistic check. We
-            # just compare the source and object file, no deep
-            # dependency checking involving header files.
-            skip_source = {}            # rebuild everything
-            for source in sources:      # no wait, rebuild nothing
-                skip_source[source] = 1
-
-            n_sources, n_objects = newer_pairwise(sources, objects)
-            for source in n_sources:    # no really, only rebuild what's
-                skip_source[source] = 0 # out-of-date
-        else:
-            # If depends is a list of files, then do a different
-            # simplistic check.  Assume that each object depends on
-            # its source and all files in the depends list.
-            skip_source = {}
-            # L contains all the depends plus a spot at the end for a
-            # particular source file
-            L = depends[:] + [None]
-            for i in range(len(objects)):
-                source = sources[i]
-                L[-1] = source
-                if newer_group(L, objects[i]):
-                    skip_source[source] = 0
-                else:
-                    skip_source[source] = 1
-
-        return objects, skip_source
-
+        # Return an empty dict for the "which source files can be skipped"
+        # return value to preserve API compatibility.
+        return objects, {}
 
     def _fix_object_args(self, objects, output_dir):
         """Typecheck and fix up some arguments supplied to various methods.
diff --git a/Misc/NEWS b/Misc/NEWS
index c09f8e6014c..54cbd77d3cf 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -60,6 +60,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #5372: Drop the reuse of .o files in Distutils' ccompiler (since
+  Extension extra options may change the output without changing the .c
+  file). Initial patch by Collin Winter.
+
 - Issue #7617: Make sure distutils.unixccompiler.UnixCCompiler recognizes
   gcc when it has a fully qualified configuration prefix. Initial patch
   by Arfrever.