[cfe-dev] libc++ on Mac OS X 10.6

[Jonathan Sauer]

>>>>>> /llvm-bin/bin/clang++ temp.cc -stdlib=libc++
>>>>>> clang: error: invalid deployment target for -stdlib=libc++ (requires Mac OS X 10.7 or later)
>>>>>> 
>>>>>> This used to work on 10.6. Was there a good reason for breaking this on 10.6, and is there any workaround?
>>>>>> 
>>>>>> I find this disappointing, as I had hoped the next release of clang, with libc++, would provide a good base-line C++0x compiler. However, I would really like not to require 10.7, as I know various people who do not intend to upgrade any time soon.
>>>>> Sorry about that.  I've updated the instructions for building on 10.6.  Do:
>>>>> 
>>>>> $ export MACOSX_DEPLOYMENT_TARGET=10.6
>>>>> 
>>>>> prior to ./buildit
>>>> That seems to work for libc++. However, the problem persists when building an XCode project on 10.6:
>>>> 
>>>> | clang: error: invalid deployment target for -stdlib=libc++ (requires Mac OS X 10.7 or later)
>>>> 
>>>> When I change the build variable MACOSX_DEPLOYMENT_TARGET to 10.7, the project builds, but of course crashes on
>>>> startup.
>>>> 
>>>> The TOT from last week worked perfectly. Is there a non-political (i.e. not Apple wanting people to ditch 10.6)
>>>> reason for this change?
>>> 
>>> T> he commit you're looking for is r141374 ( https://llvm.org/viewvc/llvm-project?view=rev&sortby=log&revision=141374 )
>>> 
>>> Until you got an official response, you can at least look at the changes, and patch your local clang copy to be able to continue to use clang/libc++ on 10.6.
>> 
>> Seems like that changes in ToolChains.cpp are related to iOS simulator, and commit message states about "Lion support", not dropping of everything else :)

Unless you only support the latest and greatest ;-)

> Yes, but despite its name, it looks like that LibCXXForSimulator is checked even when you don't target iOS (or iOS simulator).

Then I would guess it's simply a bug that Howard did not catch because he is already using 10.7.


Jonathan

P.S: After changing line 929 of ToolChains.cpp to "isMacosxVersionLT(10, 6)", clang again compiles source for 10.6.
Thanks again, Jean-Daniel!