Re: libobjc2 and powerpc.

[bertrand]

Le mardi 20 mars 2018 à 10:46 +0000, David Chisnall a écrit :
> There are two issues.  The first is the warnings in the libobjc2 build.  
> These warnings are telling you that objc_msgSend and 
> imp_implementationWithBlock (neither of which can be implemented in C) are 
> not available on your platform.  This means that you can’t use blocks as IMPs 
> and you must use the older two-stage dispatch mechanism (which clang will 
> default to for architectures where libobjc2 does not implement the 
> objc_msgSend family).
> 
> I would be very happy to help anyone who wants to add PowerPC support to 
> these code paths, but I personally have a very low tolerance for PowerPC 
> assembly and no easy access to PowerPC hardware, so won’t be doing it myself.
> 
> The later errors are coming from gas, which appears not to be supporting some 
> of the assembly that clang is generating.  You can try using -integrated-as, 
> which tells clang to generate object code directly rather than via gas.  I 
> don’t know what the status is for PowerPC, but a newer version might help 
> here (PowerPC in LLVM has had a lot of work from IBM and Argone National Labs 
> recently).
> 
> David
> 

I've set CC to 'clang -integrated-as' and CXX as well. Not a complete
success. But there is some progress. It fails at link times now in
ManyManySelectors.m because objc_msgSend is called . See below.
Thanks,
Bertrand


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> /home/bertrand/Install_GNUstep/libobjc2/block_trampolines.S:136:2: warning: 
>       imp_implementationWithBlock() not implemented for your architecture
>       [-W#warnings]
> #warning imp_implementationWithBlock() not implemented for your architecture
>  ^
> 1 warning generated.
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> /home/bertrand/Install_GNUstep/libobjc2/objc_msgSend.S:14:2: warning: 
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> #warning objc_msgSend() not implemented for your architecture
>  ^
> 1 warning generated.
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>                 expect([subclass1instance1 existsOnNotInitializedSuperclass]);
>                         ~~~~~~~~~~~~~~~~~~ ^
> /home/bertrand/Install_GNUstep/libobjc2/Test/setSuperclass.m:144:8: note: 
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>         if (!(x)) \
>               ^
> /home/bertrand/Install_GNUstep/libobjc2/Test/setSuperclass.m:224:30: warning: 
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>                 expect([subclass2instance1 existsOnNotInitializedSuperclass]);
>                         ~~~~~~~~~~~~~~~~~~ ^
> /home/bertrand/Install_GNUstep/libobjc2/Test/setSuperclass.m:144:8: note: 
>       expanded from macro 'expect'
>         if (!(x)) \
>               ^
> 2 warnings generated.
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> /home/bertrand/Install_GNUstep/libobjc2/Test/ManyManySelectors.m:40:2: 
> warning: 
>       implicitly declaring library function 'objc_msgSend' with type
>       'id (id, SEL, ...)'
>         objc_msgSend([Test class], nextSel);
>         ^
> /home/bertrand/Install_GNUstep/libobjc2/Test/ManyManySelectors.m:40:2: note: 
>       include the header <objc/message.h> or explicitly provide a declaration
>       for 'objc_msgSend'
> 1 warning generated.
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> `main':
> /home/bertrand/Install_GNUstep/libobjc2/Test/ManyManySelectors.m:(.text+0x340):
>  undefined reference to `objc_msgSend'
> clang: error: linker command failed with exit code 1 (use -v to see 
> invocation)
> Test/CMakeFiles/ManyManySelectors_optimised.dir/build.make:95: recipe for 
> target 'Test/ManyManySelectors_optimised' failed
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