[llvm-dev] Compiling GNU C Library (glibc) with llvm

[Craig Topper via llvm-dev]

The clang part is not committed yet. It’s review is here
https://reviews.llvm.org/D56571

On Sun, Feb 10, 2019 at 10:09 AM David Blaikie via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> As luck would have it, asm goto was recently implemented in LLVM:
> http://llvm.org/viewvc/llvm-project?view=revision&revision=353563 (not
> sure if it's fully baked yet, that might just be the LLVM part & maybe
> there's some Clang plumbing still required)
>
> On Sat, Feb 9, 2019 at 7:32 PM blubee blubeeme via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> The main reason is that GLIBC uses non-standards compliant extensions for
>> programmers convenience and LLVM want's to stick to the standards as much
>> as possible.
>>
>> LLVM also uses some non-standard extensions. For example asm goto; the
>> last time I checked Clang did not support ASM GOTO and so later linux
>> kernels cannot be compiled.
>>
>> The general answer comes down to standards compliance; that's my
>> understanding.
>>
>> Best,
>> Owen
>>
>> On Sun, Feb 10, 2019 at 11:23 AM Md Salman Ahmed via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>>> Hi All,
>>>
>>> I was trying to build GNU C Library (glibc implementation) using the
>>> clang compiler in a x86_64 Linux system. However, whenever I try to set the
>>> clang compiler as the compiler in the configure script of glibc, I am
>>> getting the following error.
>>>
>>> checking if clang is sufficient to build libc... no
>>>
>>>
>>> I did a quick research to see why does clang compiler is not sufficient
>>> to build the glibc implementation and found that the glibc implementation
>>> may have some target specific features that GCC only can support. But I am
>>> not getting what are the exact reasons behind this insufficiency.
>>>
>>> Can anybody please point me what are the exact reason behind this
>>> insufficiency. Some examples would also help. Any kind of help would be
>>> greatly appreciated. Thank you!
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> llvm-dev at lists.llvm.org
>>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>
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-- 
~Craig
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