Fixed #5372: .o files are now always rebuilt because file age test don't work in some case

Lib/distutils/ccompiler.py

@@ -337,10 +337,7 @@ class CCompiler:
 
     def _setup_compile(self, outdir, macros, incdirs, sources, depends,
                        extra):
-        """Process arguments and decide which source files to compile.
+        """Process arguments and decide which source files to compile."""
-
-        Merges _fix_compile_args() and _prep_compile().
-        """
         if outdir is None:
             outdir = self.output_dir
         elif not isinstance(outdir, str):
@@ -370,41 +367,6 @@ 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-                skip_source[source] = 0 # out-of-date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 = {}
@@ -413,10 +375,7 @@ class CCompiler:
             obj = objects[i]
             ext = os.path.splitext(src)[1]
             self.mkpath(os.path.dirname(obj))
-            if skip_source[src]:
+            build[obj] = (src, ext)
-                log.debug("skipping %s (%s up-to-date)", src, obj)
-            else:
-                build[obj] = src, ext
 
         return macros, objects, extra, pp_opts, build
 
@@ -463,56 +422,6 @@ class CCompiler:
 
     # _fix_compile_args ()
 
-
-    def _prep_compile(self, sources, output_dir, depends=None):
-        """Decide which souce files must be recompiled.
-
-        Determine the list of object files corresponding to 'sources',
-        and figure out which ones really need to be recompiled.
-        Return a list of all object files and a dictionary telling
-        which source files can be skipped.
-        """
-        # Get the list of expected output (object) files
-        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
-
-    # _prep_compile ()
-
-
     def _fix_object_args (self, objects, output_dir):
         """Typecheck and fix up some arguments supplied to various methods.
         Specifically: ensure that 'objects' is a list; if output_dir is
@@ -679,7 +588,6 @@ class CCompiler:
 
         Raises CompileError on failure.
         """
-
         # A concrete compiler class can either override this method
         # entirely or implement _compile().
 

Misc/NEWS

@@ -19,6 +19,10 @@ 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.
+
 
 What's New in Python 2.7 alpha 2?
 =================================