HEAD bootstrap error macOS

Gabor Greif ggreif at gmail.com
Mon Dec 23 22:52:28 UTC 2019 

I see some conflict potential from
```
Configure completed successfully.

   Building GHC version  : 8.11.0.20191222
          Git commit id  : 1c302c6289a6eddc92b48815dd420bd58eb2f286

   Build platform        : x86_64-apple-darwin
   Host platform         : x86_64-apple-darwin
   Target platform       : x86_64-apple-darwin

   Bootstrapping using   :
/nix/store/m7nigmssmx89j5v22r1a83w6fb8cs6qb-ghc-8.6.5/bin/ghc
      which is version   : 8.6.5

>>>   Using (for bootstrapping) : /nix/store/a76n8l1caynyyngdpnyihlrgyr9k9ilg-clang-wrapper-7.1.0/bin/cc
>>>   Using gcc                 : /nix/store/mq8dqgqf2qqkp77pzf3jwc05px8rkbny-clang-wrapper-9.0.0/bin/cc
      which is version       : 9.0.0
   Building a cross compiler : NO
   Unregisterised            : NO
   TablesNextToCode          : YES
   hs-cpp       :
/nix/store/mq8dqgqf2qqkp77pzf3jwc05px8rkbny-clang-wrapper-9.0.0/bin/cc
   hs-cpp-flags : -E -undef -traditional -Wno-invalid-pp-token
-Wno-unicode -Wno-trigraphs
```

It is strange that
`/nix/store/mq8dqgqf2qqkp77pzf3jwc05px8rkbny-clang-wrapper-9.0.0/bin/cc`
is identified as `gcc`. It is `clang`:
```
[nix-shell:~/ghc]$
/nix/store/mq8dqgqf2qqkp77pzf3jwc05px8rkbny-clang-wrapper-9.0.0/bin/cc
--version
clang version 9.0.0 (tags/RELEASE_900/final)
Target: x86_64-apple-darwin17.7.0
Thread model: posix
InstalledDir: /nix/store/mg8gzayayl9sbgdy5hq2km6lxgi9x6dp-clang-9.0.0/bin
```

Cheers,

    Gabor



On 12/23/19, Gabor Greif <ggreif at gmail.com> wrote:
> This is a clean tree. Modulo
> ```
> $ diff -u mk/build.mk.sample mk/build.mk
> --- mk/build.mk.sample	2019-12-07 20:44:48.850209944 +0100
> +++ mk/build.mk	2019-11-27 14:18:57.052582066 +0100
> @@ -20,7 +20,7 @@
>  #BuildFlavour = perf-cross-ncg
>
>  # Fast build with optimised libraries, no profiling (RECOMMENDED):
> -#BuildFlavour = quick
> +BuildFlavour = quick
> ```
>
> I see
> ```
> $ grep CC_LLVM_BACKEND config*
> config.log:| #define CC_LLVM_BACKEND 1
> ```
>
> Yes this is with clang-9, but it also happened with clang-7.
>
> I'll try to track this down. The TLS tip is good.
>
> Thanks,
>
>      Gabor
>
> On 12/23/19, Ben Gamari <ben at smart-cactus.org> wrote:
>> Gabor Greif <ggreif at gmail.com> writes:
>>
>>> Recently I started getting following error:
>>> ```
>>> [nix-shell:~/ghc]$ "inplace/bin/ghc-stage1" -optc-Wall -optc-Wall
>>> -optc-Wextra -optc-Wstrict-prototypes -optc-Wmissing-prototypes
>>> -optc-Wmissing-declarations -optc-Winline -optc-Wpointer-arith
>>> -optc-Wmissing-noreturn -optc-Wnested-externs -optc-Wredundant-decls
>>> -optc-Wno-aggregate-return -optc-Iincludes -optc-Iincludes/dist
>>> -optc-Iincludes/dist-derivedconstants/header
>>> -optc-Iincludes/dist-ghcconstants/header
>>> -optc-Iincludes/dist-install/build -optc-Irts -optc-Irts/dist/build
>>> -optc-DCOMPILING_RTS -optc-DFS_NAMESPACE=rts -optc-fno-strict-aliasing
>>> -optc-fno-common -optc-DDTRACE -optc-Irts/dist/build/./autogen
>>> -optc-Wno-unknown-pragmas -optc-O2 -optc-fomit-frame-pointer -optc-g
>>> -optc-DRtsWay=\"rts_thr\" -static -optc-DTHREADED_RTS  -O0 -H64m -Wall
>>>   -Iincludes -Iincludes/dist -Iincludes/dist-derivedconstants/header
>>> -Iincludes/dist-ghcconstants/header -Iincludes/dist-install/build
>>> -Irts -Irts/dist/build -DCOMPILING_RTS -DFS_NAMESPACE=rts
>>> -this-unit-id rts -dcmm-lint  -DDTRACE     -i -irts -irts/dist/build
>>> -Irts/dist/build -irts/dist/build/./autogen -Irts/dist/build/./autogen
>>>            -O2 -Wcpp-undef    -Wnoncanonical-monad-instances  -c
>>> rts/sm/Scav_thr.c -o rts/dist/build/sm/Scav_thr.thr_o -v
>>> Glasgow Haskell Compiler, Version 8.11.0.20191222, stage 1 booted by
>>> GHC version 8.6.5
>>> *** initializing package database:
>>> Using binary package database:
>>> /Users/ggreif/ghc/inplace/lib/package.conf.d/package.cache
>>> package flags []
>>> loading package database /Users/ggreif/ghc/inplace/lib/package.conf.d
>>> wired-in package ghc-prim mapped to ghc-prim-0.6.1
>>> wired-in package integer-wired-in mapped to integer-gmp-1.0.2.0
>>> wired-in package base mapped to base-4.14.0.0
>>> wired-in package rts mapped to rts
>>> wired-in package template-haskell mapped to template-haskell-2.16.0.0
>>> wired-in package ghc mapped to ghc-8.11.0.20191222
>>> !!! initializing package database: finished in 8.51 milliseconds,
>>> allocated 8.770 megabytes
>>> Created temporary directory:
>>> /var/folders/39/lr50t0q96tx5qp0mzht34r240000gn/T/ghc55616_0
>>> *** systool:cc:
>>> *** C Compiler:
>>> /nix/store/mq8dqgqf2qqkp77pzf3jwc05px8rkbny-clang-wrapper-9.0.0/bin/cc
>>> -x c rts/sm/Scav_thr.c -o
>>> /var/folders/39/lr50t0q96tx5qp0mzht34r240000gn/T/ghc55616_0/ghc_1.s
>>> -fno-common -U__PIC__ -D__PIC__ -Wimplicit -S -O2 -include
>>> /Users/ggreif/ghc/includes/ghcversion.h -Iincludes -Iincludes/dist
>>> -Iincludes/dist-derivedconstants/header
>>> -Iincludes/dist-ghcconstants/header -Iincludes/dist-install/build
>>> -Irts -Irts/dist/build -Irts/dist/build -Irts/dist/build/./autogen
>>> -I/Users/ggreif/ghc/libraries/base/include
>>> -I/Users/ggreif/ghc/libraries/base/dist-install/build/include
>>> -I/Users/ggreif/ghc/libraries/base/dist-install/build/dist-install/build/include
>>> -I/Users/ggreif/ghc/libraries/integer-gmp/include
>>> -I/Users/ggreif/ghc/libraries/integer-gmp/dist-install/build/include
>>> -I/Users/ggreif/ghc/libraries/integer-gmp/dist-install/build/dist-install/build/include
>>> -I/Users/ggreif/ghc/rts/dist/build -I/Users/ggreif/ghc/includes
>>> -I/Users/ggreif/ghc/includes/dist-derivedconstants/header
>>> -I/Users/ggreif/ghc/includes/dist-install/build -Xpreprocessor
>>> -DCOMPILING_RTS -Xpreprocessor '-DFS_NAMESPACE=rts' -Xpreprocessor
>>> -DDTRACE -Wall -Wall -Wextra -Wstrict-prototypes -Wmissing-prototypes
>>> -Wmissing-declarations -Winline -Wpointer-arith -Wmissing-noreturn
>>> -Wnested-externs -Wredundant-decls -Wno-aggregate-return -Iincludes
>>> -Iincludes/dist -Iincludes/dist-derivedconstants/header
>>> -Iincludes/dist-ghcconstants/header -Iincludes/dist-install/build
>>> -Irts -Irts/dist/build -DCOMPILING_RTS '-DFS_NAMESPACE=rts'
>>> -fno-strict-aliasing -fno-common -DDTRACE -Irts/dist/build/./autogen
>>> -Wno-unknown-pragmas -O2 -fomit-frame-pointer -g '-DRtsWay="rts_thr"'
>>> -DTHREADED_RTS
>>>
>>> In file included from rts/sm/Scav_thr.c:3:0: error:
>>>
>>> In file included from rts/sm/Scav.c:51:0: error:
>>>
>>> In file included from rts/sm/GCUtils.h:18:0: error:
>>>
>>> rts/sm/GCTDecl.h:113:1: error:
>>>      error: register '%r13' unsuitable for global register variables
>>> on this target
>>>     |
>>> 113 | GCT_REG_DECL(gc_thread*, gct, REG_Base);
>>>     | ^
>>> GCT_REG_DECL(gc_thread*, gct, REG_Base);
>>> ^
>> Hmmm, this is quite odd. Is this a clean tree? Have you pulled without
>> re-./booting and ./configure'ing recently? Are you using Apple's Clang?
>>
>> In short, we shouldn't be using a register variable at all on OS X
>> (since Apple's Clang doesn't support register variables, as this error
>> suggests). Rather, we use TLS. This is implemented here [1]. Perhaps
>> check what value configure computed for CC_LLVM_BACKEND?
>>
>> Cheers,
>>
>> - Ben
>>
>>
>> [1] https://gitlab.haskell.org/ghc/ghc/blob/master/rts/sm/GCTDecl.h#L69
>>
>

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