clang+openMP

I am struggling to install openMP with clang.. I also tried to do it via gcc but vtk installation using gcc throws error: Objective-C++ compiler not installed on this system

Have you installed Apple's dev tools? From the sounds of the error, you haven't yet installed them.

I believe u are asking for Xcode... it is installed and it uses clang as default compiler.. using that I am not able to integrate openMP with it...

Do you get an error message? You only note the problems with using GCC.

I am not able to build OpenMP Runtime Library which is required for openMP+clang ( https://clang-omp.github.io )... I get following error while trying to build using clang

make compiler=clang
omp_root=.
omp_os=macos
arch=intel64
compiler=clang
mic=no
mode=release
jobs=1
Created ./tmp directory
./tools/build.pl --arch=intel64 --mode=release lib inc common -- -j1
./tools/build.pl --arch=intel64 --mode=release lib inc common -- -j1
build.pl: (i) Goals : lib inc common -j1
build.pl: (i) Configurations : 1
build.pl: (i) Making : 1 of 1 : mac_32e-rtl_5_nor_dyn.rel.41.c0.s0...-dhcp205
-------------------------------------------------------------------------------
Started : 2015-06-11 21:31:51 UTC
Root dir : /Users/prafulag/Downloads/openmp/runtime
Build dir : tmp/src/makefile.mk
-------------------------------------------------------------------------------
----- 1/1 --- making lib inc common -----
Build : 20140926
Tools : perl=5.18.2 make=3.81 clang=3.5 clang++=3.5
Config : CPLUSPLUS=on COVERAGE=off DEBUG_INFO=off DIAG=off LIB_TYPE=norm LINK_TYPE=dyna OMP_VERSION=41 OPTIMIZATION=on VERSION=5 CPPFLAGS= CFLAGS= CXXFLAGS= FFLAGS= LDFLAGS= OMPT_SUPPORT=off OMPT_BLAME=on OMPT_TRACE=on
make[1]: *** No rule to make target `dlfcn.h', needed by `ittnotify_static.o'. Stop.
-------------------------------------------------------------------------------
Finished : 2015-06-11 21:31:51 UTC
Elapsed : 00:00:00
Result : --- Failure ---
-------------------------------------------------------------------------------

build.pl: (i) --- Failure --- : mac_32e-rtl_5_nor_dyn.rel.41.c0.s0...-dhcp205
build.pl: (i) Successes : 0 of 1
build.pl: (i) Failures : 1 of 1
build.pl: (i) Time elapsed : 00:00:00
build.pl: (i) Overall result : --- Failure ---
make: *** [omp] Error 3

According to their website, you can install it using Homebrew which would be magnitudes easier than doing it manually. Give that route a try.

I am using this

svn co llvm-project - Revision 239563: /openmp/trunk openmp
cd openmp/runtime
make compiler=gcc

Could you please link to the brew based installation instructions..

I have installed it using brew instructions... did it earlier... the issue was I had to change the paths for clang++/clang to new clang-omp/++ which I did not.. openMP is found now.. but the issue is that building says linker not found... Out for the following instructions, I am not able to find how to do the last step.. should I change CMAKE_LINKER to the given path or add some other environment variable...

Add a new user-defined setting CC with the value /usr/local/bin/clang-omp
Add -fopenmp to Other C Flags
Add /usr/local/include to Header Search Paths
Set Enable Modules (C and Objective-C) to No.
Under Build Phases
Add /usr/local/lib/libiomp5.dylib to Link Binary With Libraries