7.10.3 fails to build with Xcode 7.3

[George Colpitts]

It turns out, not surprisingly, that this also breaks ghc 8, but in a
totally different way, see
https://ghc.haskell.org/trac/ghc/ticket/11823#comment:13



On Sat, Mar 26, 2016 at 6:35 AM Manuel M T Chakravarty <chak at justtesting.org>
wrote:

> 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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