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[Anders Logg <logg@xxxxxxxxx>]

We still have problems in FFC when using the new feature for caching
generated code in Instant.

If I run the standard Poisson demo in DOLFIN (src/demo/pde/poisson/python)
then the first time Instant generates code and compiles it. Then if I
run again, the code gets reused as expected.

Now, if I remove the code generated in the working directory (the
files in the sub directory ffc_form_0_module), then I get the
following message:

File "/usr/lib/python2.5/site-packages/ffc/jit/jit.py", line 60, in jit
    instant.create_extension(wrap_headers=[filename],
    module=module_name, additional_declarations=ufc_include,
    include_dirs=path)
  File "/usr/lib/python2.5/site-packages/instant.py", line 624, in
  create_extension
    ext.create_extension(**args)
  File "/usr/lib/python2.5/site-packages/instant.py", line 262, in
  create_extension
    shutil.copytree(self.module, os.path.join(instant_dir, md5sum,
    self.module))
  File "/usr/lib/python2.5/shutil.py", line 110, in copytree
    os.makedirs(dst)
  File "/usr/lib/python2.5/os.py", line 172, in makedirs
    mkdir(name, mode)
OSError: [Errno 17] File exists:
'/home/logg/.instant/D99FA4DF3FED2EF28E77D07673A9A358/ffc_form_0_module'

Any ideas what goes wrong?

FFC calls Instant as follows:

  import instant
  instant.COPY = 1

  (path, dummy, dummy, dummy) = instant.header_and_libs_from_pkgconfig("ufc-1")

  if len(path) == 0:
    path = [("/").join(sysconfig.get_python_inc().split("/")[:-2]) + "/include"]
    ufc_include = '%%include "%s/ufc.h"' % path[0]

  module_name = prefix + "_module"
  instant.create_extension(wrap_headers=[filename], module=module_name, additional_declarations=ufc_include, include_dirs=path)

-- 
Anders