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

[Bill Wendling]

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. 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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