[Nix-dev] LLVM, Clang and GCC 5 (C++ ABI Tags)

[Christophe Trophime]

Christophe TROPHIME 
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----- Original Message -----

> From: "Aristid Breitkreuz" <aristidb at gmail.com>
> To: "nix-dev" <nix-dev at lists.science.uu.nl>
> Sent: Sunday, September 4, 2016 12:17:47 PM
> Subject: [Nix-dev] LLVM, Clang and GCC 5 (C++ ABI Tags)

> Hi all,

> I've been trying to fix the ISPC build, only to find that clang 3.8 does not
> support GCC 5's ABI Tags, which means that functions returning std::string
> may lead to compiler errors. LLVM/Clang 3.9 apparently does:
> http://llvm.org/releases/3.9.0/docs/ReleaseNotes.html#gcc-abi-tag

> I think this thread is also relevant:
> https://llvm.org/bugs/show_bug.cgi?id=23529

> So I suppose the solution for ISPC will be to either switch to LLVM 3.9 or a
> clang using libcxx rather than libstdc++.

> What do you think? Have you seen other packages fail due to this?

There are patches to fix clang 3.8. 
See this note from debian clang 3.8.1 latest package: 
- Add support for gcc's attribute abi_tag (needed for compatibility with
      GCC 5's libstdc++); taken from the trunk (Closes: #797038)
      (LP: #1510042, #1488254)
      D17567-PR23529-Sema-part-of-attrbute-abi_tag-support.diff
      D18035-PR23529-Mangler-part-of-attrbute-abi_tag-support.diff 
The best will be to patch clang 3.8.1 no need to use libcxx... 

> Cheers,

> Aristid

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