[libcxx-dev] Requiring Mac OS >= 10.12 to build libc++.dylib

[Louis Dionne via libcxx-dev]

> On Feb 18, 2020, at 03:29, Ken Cunningham <ken.cunningham.webuse at gmail.com> wrote:
> 
> Oh, I see. It’s clock_gettime that we’ll be expecting from now onwards.
> 
> We do have a compatibility implementation of this for MacPorts already that we use when needed <https://github.com/macports/macports-legacy-support/blob/master/src/time.c <https://github.com/macports/macports-legacy-support/blob/master/src/time.c>> . I suppose I might leverage that implementation for older systems…

Ok, so it doesn't look like a dealbreaker for you. LMK if I misunderstood.

Louis

> 
>> On Feb 17, 2020, at 11:37 PM, Ken Cunningham <ken.cunningham.webuse at gmail.com <mailto:ken.cunningham.webuse at gmail.com>> wrote:
>> 
>> Hi,
>> 
>> We do build libc++.dylib on MacPorts for users to install, currently on systems from 10.5 up, but some intrepid users have built it for 10.4. 
>> 
>> Users have the option to replace their system installed libc++.dylib as well on 10.7+ if they choose to do so. 
>> 
>> I was recently contemplating a way to co-install a newer libc++.dylib to use for MacPorts-installed software to build against to get newer libc++ features, but have not as yet embarked on that.
>> 
>> To build libc++ and libc++abi at present, Jeremy resuscitated the “buildit” and “testit” Makefiles so as to remove the need for a full cmake installation to bootstrap to libc++.dylib and to allow fine-grained tweaking, but moving to the monorepo and installing libc++ from there in the usual fashion is also a consideration.
>> 
>> For interest, we add the linux cxa_thread_atexit implementation to libc++abi.dylib for thread_local support on < 10.7, and it works quite nicely.
>> 
>> What part of the build is going to become 10.12+ only? If it’s a compiler issue, that is easy enough to work around. If it’s system infrastructure, not so easy…
>> 
>> I guess I’ll look at D74489 and see. This may cap out out libc++ offerings for older systems at 10.0 I suppose.
>> 
>> Best,
>> 
>> Ken
>> 
>> 
>>> On Feb 17, 2020, at 7:06 AM, Louis Dionne via libcxx-dev <libcxx-dev at lists.llvm.org <mailto:libcxx-dev at lists.llvm.org>> wrote:
>>> 
>>> Hi,
>>> 
>>> This is a heads up that building the libc++ dylib on Mac OS will require Mac OS >= 10.12 once I land D74489. This will allow us to perform code simplifications in libc++, which is sorely needed because maintenance has become difficult with time. Please note that this only means that Mac OS >= 10.12 will be required to build the dylib.
>>> 
>>> If you are building the libc++ dylib on Mac OS < 10.12, please reach out so we can talk about a way forward.
>>> 
>>> Cheers,
>>> Louis
>>> 
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>> 
> 

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