build: use bb.process instead of os.system

(Bitbake rev: 53740977521bc81ffa37adfa7bbeb8f2a80ea165)

build: write logfiles per task, not per function
Based on d14f9bf6 from poky, reworked for master and other cleanup.

(Bitbake rev: beadff2eca1eb95f0411115dd72ddb4c3c44c604)

Signed-off-by: Chris Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

bitbake/lib/bb/utils.py

@@ -579,6 +579,17 @@ def build_environment(d):
         if export:
             os.environ[var] = bb.data.getVar(var, d, True) or ""
 
+def remove(path, recurse=False):
+    """Equivalent to rm -f or rm -rf"""
+    import os, errno, shutil
+    try:
+        os.unlink(path)
+    except OSError, exc:
+        if recurse and exc.errno == errno.EISDIR:
+            shutil.rmtree(path)
+        elif exc.errno != errno.ENOENT:
+            raise
+
 def prunedir(topdir):
     # Delete everything reachable from the directory named in 'topdir'.
     # CAUTION:  This is dangerous!