depcomp for Portland Group Compilers: get rid of file locking hack?

[Stefano Lattarini]

Reading the documentation provided here:

  <http://www.pgroup.com/doc/pgiref.pdf>

I see that the the '-MD' option should also accept an argument:

  -MD,filename  (pgcpp only) Generate make dependence lists and print
                             them to file filename.

maybe we could we use this to get rid of the need of the horrid file-locking
hack -- explained in this comments from depcomp:

  # For projects that build the same source file twice into different object
  # files, the pgcc approach of using the *source* file root name can cause
  # problems in parallel builds.  Use a locking strategy to avoid stomping on
  # the same $tmpdepfile.

In particular, I propose the attached patch.  Can you give it a try to check
whether it works?

Thanks,
  Stefano

0001-depcomp-get-rid-of-file-lock-hack-for-Portland-Group.patch
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