[GHC] #7992: Wrong invocation of configure script in libffi and integer-gmp

[GHC]

#7992: Wrong invocation of configure script in libffi and integer-gmp
--------------------------------+-------------------------------------------
Reporter:  merijn               |          Owner:                  
    Type:  bug                  |         Status:  new             
Priority:  normal               |      Component:  Build System    
 Version:  7.7                  |       Keywords:  patch           
      Os:  Unknown/Multiple     |   Architecture:  Unknown/Multiple
 Failure:  Building GHC failed  |      Blockedby:                  
Blocking:                       |        Related:                  
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 Similar to the fixed cabal issue:
 https://github.com/haskell/cabal/pull/1021

 The autoconf generated configure script tries to automatically determine
 the location of the configure script. If the name (argv[0]) of the
 configure script does not include a path separator autoconf will first
 scan the path for a file named "configure" before defaulting to the
 current directory.

 The libffi and integer-gmp make files previously called configure by doing
 "$(SHELL) configure" this will result in it finding any files named
 "configure" in the path and using the location of that file as the basedir
 to look for the build's sub directoris. The result is that the libffi
 /integer-gmp header files, etc. are not found, resulting in a build
 failure when trying to compile GHC.

 Changing the makefiles to use "$(SHELL) ./configure" will avoid this
 behaviour, the presence of a path separator causes autoconf to default to
 checking the current directory first.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7992>
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