[GHC] #9876: mkdir errors when running `make sdist`

[GHC]

#9876: mkdir errors when running `make sdist`
-------------------------------------+-------------------------------------
       Reporter:  joehillen          |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Compiler           |                 Version:  7.9
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Easy (less than 1  |         Type of failure:
  hour)                              |  None/Unknown
     Blocked By:                     |               Test Case:
Related Tickets:                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 Hi. Newcomer here. I was taking a look at #9095 and I get the following
 errors when running `make sdist`.

 {{{
 "rm" -f sdistprep/ghc-7.9.20141208-windows-extra-src.tar.bz2
 mkdir sdistprep
 mkdir: cannot create directory ‘sdistprep’: File exists
 make[1]: [sdist-windows-tarballs-prep] Error 1 (ignored)
 mkdir sdistprep/windows-tarballs
 mkdir sdistprep/windows-tarballs/ghc-7.9.20141208
 mkdir sdistprep/windows-tarballs/ghc-7.9.20141208/ghc-tarballs
 cd sdistprep/windows-tarballs/ghc-7.9.20141208/ghc-tarballs && lndir
 /home/joe/src/ghc/ghc-tarballs
 "rm" -rf sdistprep/windows-tarballs/ghc-7.9.20141208/ghc-tarballs/.git
 cd sdistprep/windows-tarballs && "/bin/tar" chf - ghc-7.9.20141208 2>
 windows_extra_src_ghc_log | bzip2 -c >
 /home/joe/src/ghc/sdistprep/ghc-7.9.20141208-windows-extra-src.tar.bz2
 "rm" -rf sdistprep/testsuite-ghc
 "rm" -f sdistprep/ghc-7.9.20141208-testsuite.tar.bz2
 mkdir sdistprep
 mkdir: cannot create directory ‘sdistprep’: File exists
 make[1]: [sdist-testsuite-prep] Error 1 (ignored)
 mkdir sdistprep/testsuite-ghc
 mkdir sdistprep/testsuite-ghc/ghc-7.9.20141208
 mkdir sdistprep/testsuite-ghc/ghc-7.9.20141208/testsuite
 cd sdistprep/testsuite-ghc/ghc-7.9.20141208/testsuite && lndir
 /home/joe/src/ghc/testsuite
 /home/joe/src/ghc/testsuite: No such file or directory
 make[1]: *** [sdist-testsuite-prep] Error 1
 make: *** [sdist] Error 2
 }}}

 Generally when using 'mkdir' in a Makefile I've found it best to always
 use 'mkdir -p' just like you should how you should always use 'rm -f'.

 It's a simple fix. I'm submitting a patch for it.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9876>
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