Subject: Re: [boost] clang type traits
From: Daniel James (dnljms_at_[hidden])
Date: 2011-06-13 15:47:36
On 13 June 2011 20:33, Doug Gregor <doug.gregor_at_[hidden]> wrote:
> On Sun, Jun 12, 2011 at 4:27 AM, Daniel James <dnljms_at_[hidden]> wrote:
>> On 10 June 2011 18:13, Doug Gregor <doug.gregor_at_[hidden]> wrote:
>>> For Clang feature tests, please use __has_feature (or the newer
>>> __has_extension) rather than peeking at Clang version numbers.
>>> __has_feature/__has_extension are language-dialect aware and represent
>>> what the compiler actually supports, while Clang version numbers can
>>> vary widely from one vendor to another (e.g., Apple's version numbers
>>> for its Clang-based compilers are distinct from the LLVM project's
>>> version numbers for Clang).
>> Can we distinguish between Apple's versions and LLVM's versions?
> __APPLE_CC__ will say whether we're running on Darwin, but otherwise, no.
That will a problem for working around bugs.
Anyway, I think this means the type traits change is incorrect. Since
this is for a version of clang that won't be released for some time,
it's probably best to revert it in the release branch.
Boost list run by bdawes at acm.org, gregod at cs.rpi.edu, cpdaniel at pacbell.net, john at johnmaddock.co.uk