[lldb-dev] Fixing OS X Xcode build

Todd Fiala via lldb-dev lldb-dev at lists.llvm.org
Thu Jan 28 11:09:09 PST 2016

Yeah, we poked around at it for a while here.

This is the issue I hit:

-- Performing Test HAVE_CXX_ATOMICS_WITHOUT_LIB - Failed
-- Looking for __atomic_fetch_add_4 in atomic
-- Looking for __atomic_fetch_add_4 in atomic - not found

CMake Error at cmake/modules/CheckAtomic.cmake:36 (message):
  Host compiler appears to require libatomic, but cannot find it.

Call Stack (most recent call first):
  cmake/config-ix.cmake:296 (include)
  CMakeLists.txt:409 (include)
-- Configuring incomplete, errors occurred!

With a deployment target set to 10.8, it doesn't find the atomic header or
a lib.  With a deployment target of 10.9, it passes.  (It finds the
header).  This is using Xcode 7.2 and 7.3 beta1 compilers, our latest
publicly available options.

On Thu, Jan 28, 2016 at 7:16 AM, Nico Weber <thakis at chromium.org> wrote:

> On Thu, Jan 28, 2016 at 9:28 AM, Todd Fiala via lldb-dev <
> lldb-dev at lists.llvm.org> wrote:
>> This is all fixed up by r259028.  Change comments for r259027 contain
>> some changes to the build requirements for Xcode OS X builds.
>> These boil down to essentially:
>> * OS X 10.9 is the minimum deployment version now, up from 10.8.  This is
>> driven by the LLVM/clang cmake-based build.
> (FWIW we build clang binaries with a deployment target of 10.6 (this
> requires some trickery due to libc++ not being there) -- the cmake-based
> build should at least support 10.7 without any problems as far as I know.
> Not that I have a problem with lldb requiring 10.9+, the reason just sounds
> a bit surprising to me.)
>> * Cmake is now required.  (Not surprising, hopefully).
>> * The build grabs LLVM and clang source with git via the
>> http://llvm.org/git/{project}.git mirrors if the code doesn't already
>> exist accessible via the lldb/llvm and lldb/llvm/tools/clang directory
>> locations.  Previously it would use svn for the initial retrieval.
>> The buildbot is turned back on and is now green.  r259028 fixed a minor
>> breakage in the gtest target that I forget to check when doing the work for
>> r259027.
>> Let me know if you have any questions!
>> -Todd
>> On Wed, Jan 27, 2016 at 7:30 AM, Todd Fiala <todd.fiala at gmail.com> wrote:
>>> Hi all,
>>> At the current moment the OS X Xcode build is broken.  I'll be working
>>> on fixing it today.  As has been discussed in the past, post llvm/clang-3.8
>>> the configure/automake system was getting stripped out of LLVM and clang.
>>> The OS X Xcode build has a legacy step in it that still uses the
>>> configure-based build system.  I'll be cleaning that up today.
>>> In the meantime, expect if you use the Xcode build that you'll either
>>> need to work with llvm/clang from earlier than yesterday (along with
>>> locally undoing any changes in lldb for llvm/clang changes - there was at
>>> least one yesterday), or just sit tight a bit.
>>> Thanks!
>>> --
>>> -Todd
>> --
>> -Todd
>> _______________________________________________
>> lldb-dev mailing list
>> lldb-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev

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