[GHC] #16051: Cross compilation broken under Hadrian

[GHC]

#16051: Cross compilation broken under Hadrian
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.8.1
       Component:  Build System      |              Version:  8.7
  (Hadrian)                          |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Description changed by bgamari:

Old description:

> Hadrian falls over essentially immediately when cross-compiling:
> {{{
> $ ./boot
> $ ./configure --target=aarch64-linux-gnu
> $ hadrian/build.cabal.sh -j32
> }}}

New description:

 Hadrian falls over essentially immediately when cross-compiling:
 {{{
 $ ./boot
 $ ./configure --target=aarch64-linux-gnu
 $ hadrian/build.cabal.sh -j32
 Up to date
 Up to date
 | Copy file: settings => _build/stage1/lib/settings
 | Copy file: settings => _build/stage0/lib/settings
 | Copy file: utils/hsc2hs/template-hsc.h => _build/stage0/lib/template-
 hsc.h
 | Copy file: llvm-targets => _build/stage0/lib/llvm-targets
 | Copy file: driver/ghc-usage.txt => _build/stage0/lib/ghc-usage.txt
 | Copy file: llvm-passes => _build/stage0/lib/llvm-passes
 | Copy file: driver/ghci-usage.txt => _build/stage0/lib/ghci-usage.txt
 shakeArgsWith   0.000s    0%
 Function shake  0.084s   20%  ======
 Database read   0.000s    0%
 With database   0.000s    0%
 Running rules   0.329s   79%  =========================
 Total           0.415s  100%
 Error when running Shake build system:
   at src/Rules.hs:(35,19)-(48,17):
   at src/Rules.hs:48:5-17:
 * Depends on: _build/stage2/bin/aarch64-linux-gnu-ghctags
   at src/Hadrian/Utilities.hs:292:5-18:
 * Depends on: _build/stage0/bin/aarch64-linux-gnu-ghctags
 * Raised the exception:
 Unknown program "_build/stage0/bin/aarch64-linux-gnu-ghctags"
 CallStack (from HasCallStack):
   error, called at src/Rules/Program.hs:26:29 in main:Rules.Program
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16051#comment:2>
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