HEAD bootstrap error macOS

Gabor Greif ggreif at gmail.com
Tue Dec 24 00:15:56 UTC 2019 

Comparing the above to the (successfully bootstrapping) Darwin CI
job's configure output:
```
   Using (for bootstrapping) : gcc
   Using gcc                 : cc
      which is version       : 11.0.0
```


On 12/23/19, Gabor Greif <ggreif at gmail.com> wrote:
> 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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