[llvm-dev] Is the CppBackend still supported?

[Justin Bogner via llvm-dev]

Stanislav Manilov via llvm-dev <llvm-dev at lists.llvm.org> writes:
> 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?

It is supposed to work, but it's definitely broken. I suppose nobody
motivated to fix it has noticed :(

Feel free to file a bug on llvm.org/bugs or to try to fix these issues
and send patches. Sorry I don't have a better answer for you.

> 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
> 0dbefa1b83eb90f7a06b5df5df254ce32be3db4b) (http://llvm.org/git/llvm.git
> 33c352b3eda89abc24e7511d9045fa2e499a42e3)
>     Target: x86_64-unknown-linux-gnu
>     Thread model: posix
>
> llc version:
>
>     LLVM (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
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