[LLVMdev] [cfe-dev] [RFC] When can libc++ "officially" support linux?

[Hal Finkel]

----- Original Message -----
> From: "Eric Fiselier" <eric at efcs.ca>
> To: "cfe-dev at cs.uiuc.edu Developers" <cfe-dev at cs.uiuc.edu>, "LLVM Dev" <llvmdev at cs.uiuc.edu>, "Marshall Clow"
> <mclow.lists at gmail.com>, "Dan Albert" <danalbert at google.com>, "Chandler Carruth" <chandlerc at google.com>
> Sent: Friday, February 20, 2015 8:48:18 PM
> Subject: [cfe-dev] [RFC] When can libc++ "officially" support linux?
> 
> Hi All,
> 
> Currently libc++ does not list linux as a supported platform. This
> should change. I think we should be able to list linux (with
> libc++abi) as a supported configuration. but there are some issues I
> would like to see resolved first.
> 
> 1. We should add CMake support for building libc++ against a static
> libc++abi. If libc++ is linked to a shared libc++abi the resulting
> library can only be used when libc++abi is manually linked by the
> user. We should strongly prefer building libc++ against a static
> libc++abi on linux.
> 
> 2. We need to clarify how libstdc++ and libsupc++ can be used as
> libc++'s ABI library and explicitly define the level of support for
> these configurations. Are there any people using this functionality?
> These configurations have been broken for GCC >= 4.9.2 and I haven't
> heard any complaints. I would like to drop these configurations all
> together.

I'm currently using the configuration where libc++ builds on top of libstdc++ (specifically, the version from GCC 4.7.2). I have vendor-provided static libraries that I need to link against (although only use via a C API) that were compiled against libstdc++. Please don't drop that configuration.

Thanks again,
Hal

> 
> 3. Tests should be added that verify the exception types in libc++
> and
> libstdc++ are ABI compatible and can be thrown between libraries.
> 
> Is there anything else that needs to be done before libc++
> "officially" supports linux?
> 
> /Eric
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-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory