[LLVMdev] Clang 3.5 Release Pre-Pre-Pre-Announcement

[Jack Howarth]

Bill,
     Actually,the solution we are going to use in fink is to apply a diff
of current clang-omp (which is based on stock clang 3.4) from commit
f9e2fd7640f8fc06ebe1ef2f065c6158f6b4b6ef against stock clang 3.4 to our
llvm34-3.4.1 package in fink. This is built against a openmp r208472 pull
from trunk at llvm.org. The resulting clang 3.4.1 compiler defaults
-fopenmp to -liomp5 (as that switch over as already occurred in clang-omp
github). It passes all of the OpenMP3.1_Validation except for a known
failure (https://github.com/clang-omp/clang/issues/34) as well as all
of taskbench-1.0-20110715 on x86_64-apple-darwin11/12/13. It should appear
in the fink packaging set after we sort out some unrelated packaging issues.
            Jack


On Thu, May 22, 2014 at 1:26 AM, Bill Wendling <isanbard at gmail.com> wrote:

> Hi Jack,
>
> I didn’t have any specific plans for OpenMP in the release. If you’d be
> willing to test and build for OpenMP, then we could release it. :-)
>
> -bw
>
> On May 18, 2014, at 4:46 PM, Jack Howarth <howarth.mailing.lists at gmail.com>
> wrote:
>
> Bill,
>      I have the openmp support in llvm 3.5svn now built on 10.7 using
> Xcode 4.6.3 and 10.8/10.9 using 5.1.1. The 10.7 build required the hack…
>
> perl -pi -e 's|list\(APPEND SANITIZER_COMMON_SUPPORTED_DARWIN_OS
> iossim\)||g' projects/compiler-rt/CMakeLists.txt
>
> to suppress building libclang_rt.asan_iossim_dynamic.dylib. The
> compiler-rt build now expects the iPhoneSimulator7.0.0.sdk but Xcode 4.6.3
> only has the /iPhoneSimulator6.1.sdk. I tried tweaking that back to 6.1 but
> the build of llibclang_rt.asan_iossim_dynamic.dylib. wants link to a copy
> of
> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.1.sdk/usr/lib/libc++.dylib
> as a x86_64 binary but it only exists as i386.
>           Jack
> ps The previous report of omp_workshare2.c example failing to compile can
> be ignored as that was a stray character in my copy.
>
> On Sun, May 18, 2014 at 3:31 PM, Jack Howarth <
> howarth.mailing.lists at gmail.com> wrote:
>
>>    It appears that the failure in the openmp build is due to a race
>> condition as if I use…
>>
>> make -j1 compiler=clang
>>
>> the failure in building openmp on my 10.8 box disappears.
>>
>>
>>
>> On Sun, May 18, 2014 at 1:36 PM, Jack Howarth <
>> howarth.mailing.lists at gmail.com> wrote:
>>
>>> Bill,
>>>      Are there any plans to integrate the new openmp support into the
>>> llvm/clang 3.5 build process? I have been able to build the current
>>> llvm/clang/compiler-rt/openmp svn on Mac OS X 10.9 out of tree with…
>>>
>>>         pushd projects/openmp/runtime
>>>         make compiler=clang
>>>         popd
>>>
>>> and then
>>>
>>>         OPENMP_DIR=`ls projects/openmp/runtime/tmp | grep dyn`
>>>         pushd projects/openmp/runtime/tmp/$OPENMP_DIR
>>>         install -m 755 libiomp5.dylib %i/opt/llvm-%v/lib/libgomp.dylib
>>>         install -m 644 *.h %i/opt/llvm-%v/lib/clang/%v/include
>>>         popd
>>>
>>> in our fink llvm packaging.
>>>     It would be nice to see the cmake build machinery updated to
>>> automatically build and install openmp if its sources are placed in the
>>> projects subdirectory of the llvm-3.5.0 source directory. Even if there
>>> isn't cmake build integration, but assuming an openmp 3.5.0 tar ball will
>>> be released for llvm/clang 3.5.0, the flag for openmp support needs to be
>>> synced to the library name generated in openmp. Currently, the clang flag
>>> -fopenmp flag emits -lgomp whereas the openmp svn currently produces a
>>> libiomp5.dylib instead. Also, the clang compiler currently has to be passed
>>> an explicitly library path to the location of the libgomp.dylib with -L.
>>> While the openmp headers can be found by clang when placed in clang's
>>> include directory, the libgomp.dylib shared lib isn't found when placed in
>>> any of the llvm/clang internal lib directories. If the file is going to be
>>> renamed as libgomp.dylib, it should be buried in the llvm/clang directories
>>> so that it doesn't collide with the FSF one. I can see the rational of
>>> using libgomp.dylib, so that configure and cmake detection of openmp is
>>> triggered, but in the long run it probably should be using a different
>>> shared library name.
>>>             Jack
>>> ps I found on 10.9, that current llvm/clang/openmp can compile and run
>>> all of the example code at
>>> https://computing.llnl.gov/tutorials/openMP/exercise.html to build
>>> except for omp_workshare2.c<https://computing.llnl.gov/tutorials/openMP/samples/C/omp_workshare2.c>.
>>> FYI, there appears to be an issue with building current openmp on 10.8
>>> using the same approach. The openmp code appears to compile but the build
>>> fails with…
>>>
>>> make[1]: Leaving directory
>>> '/sw/src/fink.build/llvm35-3.5.0-0/llvm-3.5.0/projects/openmp/runtime/tmp/mac_32e-rtl_5_nor_dyn.12.rel.40.c0.t0-prrg4'
>>>
>>> -------------------------------------------------------------------------------
>>> Finished  : 2014-05-17 01:49:01 UTC
>>> Elapsed   : 00:00:02
>>> Result    : --- Failure ---
>>>
>>> -------------------------------------------------------------------------------
>>>
>>>
>>
>
>
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