7.10.3 fails to build with Xcode 7.3

[Manuel M T Chakravarty]

I just noticed that GHC 7.10.3 (latest release version) fails to build with version 7.3 of Xcode (which just came out of beta). Maybe this is due to

  https://ghc.haskell.org/trac/ghc/ticket/11744

The problem manifests in the form of a SEGV when dll-split is invoked for the first time — specifically lldb has the following to say,

Process 17348 launched: '../lib/bin/dll-split' (x86_64)
Process 17348 stopped
* thread #1: tid = 0x4a821e, 0x0000000100e26357 libHSrts-ghc7.10.3.dylib`stg_returnToStackTop + 7, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x1e)
    frame #0: 0x0000000100e26357 libHSrts-ghc7.10.3.dylib`stg_returnToStackTop + 7
libHSrts-ghc7.10.3.dylib`stg_returnToStackTop:
->  0x100e26357 <+7>:  movq   0x1e(%rax), %rbx
    0x100e2635b <+11>: movq   0x10(%rbx), %rbp
    0x100e2635f <+15>: leaq   0x126(%rbx), %r15
    0x100e26366 <+22>: movq   $0x0, 0x904(%r13)

Interestingly, the GHC 8.0.1-rc2 build does not exhibit that same failure. It does, however, fail to build due to an undefined symbol:

Undefined symbols for architecture x86_64:
  "_stg_sel_18_upd_info", referenced from:
      _sc9J_info in Monad.dyn_o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
`gcc' failed in phase `Linker'. (Exit code: 1)
make[1]: *** [ghc/stage2/build/tmp/ghc-stage2] Error 1
make: *** [all] Error 2

(This may be unrelated to Xcode 7.3 and a known problem on OS X with that RC. I didn’t follow the 8.0.1-rc2 tickets in detail.)

As I assume that there will be no further 7.10 release, I am posting this here just to save others the time to track the problem down.

Manuel

PS: I wish I had the time to check GHC builds with Xcode beta releases, but alas, I usually don’t.
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