[llvm-dev] Is the CppBackend still supported?

[James Y Knight via llvm-dev]

There was, a long time ago, a backend that actually targetted C. It was
deleted in 2012 at r153307.

On Sun, May 22, 2016 at 8:37 AM, Stefan Gränitz <stefan.graenitz at gmail.com>
wrote:

> after realizing that it wasn't actually a backend that targetted c++
> (which might be useful)
>
> Exact same thing just happened to me.. it's not obvious, especially when
> reading the llc info:
>
> $ llc -version
>   Registered Targets:
>     arm        - ARM
>     arm64      - ARM64 (little endian)
>     cpp        - C++ backend
>     x86        - 32-bit X86: Pentium-Pro and above
>     x86-64     - 64-bit X86: EM64T and AMD64
>     ...
>
> * If not delete it, then at least adjust the description? E.g. "LLVM C++
> API code" following http://ellcc.org/demo/ ? Could also the name change
> to "cppapi"?
>
> * Has there ever been an attempt to implement a real C++ Backend? Without
> having done research in that direction - shouldn't that be quite
> straightforward? Anyone aware of technical difficulties?
>
> Cheers,
> Stefan
>
> -- https://about.me/stefan.graenitz
>
>
> Am 03.05.16 um 22:23 schrieb James Y Knight via llvm-dev:
>
> Yes, it's quite obviously dead and should be deleted.
>
> When I brought this up last time -- after realizing that it wasn't
> actually a backend that targetted c++ (which might be useful), but rather
> just something that emitted IR by calling llvm C++ functions (which really
> isn't IMO) -- someone also pointed out that it also really ought to be
> using IRBuilder...if anyone cared about it.
>
>
> On Tue, May 3, 2016 at 4:14 PM, Sean Silva via llvm-dev <
> <llvm-dev at lists.llvm.org>llvm-dev at lists.llvm.org> wrote:
>
>> AFAICT it is dead.
>>
>> On Tue, May 3, 2016 at 4:04 AM, Stanislav Manilov via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>>> Hello,
>>>
>>> I was trying to compile a simple program with the CppBackend like so:
>>>
>>> $ clang str_arg.c -emit-llvm -S
>>> $ llc -march=cpp str_arg.ll
>>>
>>> It produces a file `str_arg.cpp` as expected, however it doesn't seem
>>> that the resulting file is correct. For once, it includes
>>> `<llvm/Analysis/Verifier.h>` which seems to have been moved to
>>> `llvm/IR/Verifier.h` as far back as 2013.
>>>
>>> My question is this: is the CppBackend supposed to work? If so, what am
>>> I missing?
>>>
>>> Listing of str_arg.c:
>>>
>>>     #include <stdio.h>
>>>
>>>     void i(unsigned index, char *string) {
>>>       printf("%d %s\n", index, string);
>>>     }
>>>
>>>     int main() {
>>>       i(10, "foo");
>>>       return 0;
>>>     }
>>>
>>> clang version:
>>>
>>>     clang version 3.7.1 ( <http://llvm.org/git/clang.git>
>>> http://llvm.org/git/clang.git 0dbefa1b83eb90f7a06b5df5df254ce32be3db4b)
>>> (http://llvm.org/git/llvm.git 33c352b3eda89abc24e7511d9045fa2e499a42e3)
>>>     Target: x86_64-unknown-linux-gnu
>>>     Thread model: posix
>>>
>>> llc version:
>>>
>>>     LLVM ( <http://llvm.org/>http://llvm.org/):
>>>       LLVM version 3.7.1
>>>       Optimized build.
>>>       Built Apr  4 2016 (15:04:44).
>>>       Default target: x86_64-unknown-linux-gnu
>>>       Host CPU: ivybridge
>>>
>>>       Registered Targets:
>>>         aarch64    - AArch64 (little endian)
>>>         aarch64_be - AArch64 (big endian)
>>>         amdgcn     - AMD GCN GPUs
>>>         arm        - ARM
>>>         arm64      - ARM64 (little endian)
>>>         armeb      - ARM (big endian)
>>>         bpf        - BPF (host endian)
>>>         bpfeb      - BPF (big endian)
>>>         bpfel      - BPF (little endian)
>>>         cpp        - C++ backend
>>>         hexagon    - Hexagon
>>>         mips       - Mips
>>>         mips64     - Mips64 [experimental]
>>>         mips64el   - Mips64el [experimental]
>>>         mipsel     - Mipsel
>>>         msp430     - MSP430 [experimental]
>>>         nvptx      - NVIDIA PTX 32-bit
>>>         nvptx64    - NVIDIA PTX 64-bit
>>>         ppc32      - PowerPC 32
>>>         ppc64      - PowerPC 64
>>>         ppc64le    - PowerPC 64 LE
>>>         r600       - AMD GPUs HD2XXX-HD6XXX
>>>         sparc      - Sparc
>>>         sparcel    - Sparc LE
>>>         sparcv9    - Sparc V9
>>>         systemz    - SystemZ
>>>         thumb      - Thumb
>>>         thumbeb    - Thumb (big endian)
>>>         x86        - 32-bit X86: Pentium-Pro and above
>>>         x86-64     - 64-bit X86: EM64T and AMD64
>>>         xcore      - XCore
>>>
>>> Kind regards,
>>>  - Stan
>>>
>>>
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> llvm-dev at lists.llvm.org
>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>
>>>
>>
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