[GHC] #10456: Wrong CPP during cross-compilation

[GHC]

#10456: Wrong CPP during cross-compilation
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        Reporter:  jakzale           |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  low               |               Milestone:
       Component:  Build System      |                 Version:  7.11
      Resolution:                    |                Keywords:  cross-
Operating System:  Unknown/Multiple  |  compiling
 Type of failure:  Building GHC      |            Architecture:
  failed                             |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by rwbarton):

 I can reproduce this with just `./configure --target=i386-unknown-linux`,
 though using the wrong CPP to build dependencies has no visibly bad
 effects in my case. The OP's immediate issue is that the build system
 knows it is doing a build for the host system, so it added `-m64`, but
 then actually used the cross-compiler for CPP.

 I wonder whether, until recently (when the stage1 compiler gained some TH
 support), it was the case that there was no C code in the compiler proper
 (as opposed to the rts and libraries)?

 I guess we need separate CPP_STAGEn variables, or to have the dependency
 generation use CC rather than CPP...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10456#comment:4>
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