When trying to build MITK with OpenMP (needed e.g. for MITK Diffusion) it does not build on OSX High Sierra (compiler: clang). Worked in previous OSX versions but not in the recent one anymore.
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Error Message: clang: error: unsupported option '-fopenmp'
On High Sierra in clang / LLVM 9.0.0 "-fopenmp" is no longer supported. Manually installing OpenMP does not help, because the flag simply is not supported anymore.
Using gcc-7 would allow using OpenMP, however, the MITK build (target: workbench-release) fails with the following error:
Scanning dependencies of target vtkfreetype
[ 34%] Building C object ThirdParty/freetype/vtkfreetype/CMakeFiles/vtkfreetype.dir/src/base/ftbase.c.o
In file included from /System/Library/Frameworks/Security.framework/Headers/AuthSession.h:32:0,
from /System/Library/Frameworks/Security.framework/Headers/Security.h:43,
from /System/Library/Frameworks/CoreServices.framework/Frameworks/OSServices.framework/Headers/CSIdentity.h:43,
from /System/Library/Frameworks/CoreServices.framework/Frameworks/OSServices.framework/Headers/OSServices.h:27,
from /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Headers/IconsCore.h:23,
from /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Headers/LaunchServices.h:22,
from /System/Library/Frameworks/CoreServices.framework/Headers/CoreServices.h:39,
from /Users/jakob/dev/MITK-sb-workbench-gcc/ep/src/VTK/ThirdParty/freetype/vtkfreetype/src/base/ftmac.c:100,
from /Users/jakob/dev/MITK-sb-workbench-gcc/ep/src/VTK/ThirdParty/freetype/vtkfreetype/src/base/ftbase.c:38:
/System/Library/Frameworks/Security.framework/Headers/Authorization.h:193:7: error: variably modified 'bytes' at file scope
char bytes[kAuthorizationExternalFormLength];
^~~~~
In file included from /System/Library/Frameworks/CoreGraphics.framework/Headers/CGContext.h:18:0,
from /System/Library/Frameworks/CoreGraphics.framework/Headers/CGBitmapContext.h:9,
from /System/Library/Frameworks/CoreGraphics.framework/Headers/CoreGraphics.h:11,
from /System/Library/Frameworks/ApplicationServices.framework/Headers/ApplicationServices.h:35,
from /Users/jakob/dev/MITK-sb-workbench-gcc/ep/src/VTK/ThirdParty/freetype/vtkfreetype/src/base/ftmac.c:101,
from /Users/jakob/dev/MITK-sb-workbench-gcc/ep/src/VTK/ThirdParty/freetype/vtkfreetype/src/base/ftbase.c:38:
/System/Library/Frameworks/CoreGraphics.framework/Headers/CGFont.h:53:40: error: initializer element is not constant
static const CGFontIndex kCGGlyphMax = kCGFontIndexMax;
^~~~~~~~~~~~~~~
In file included from /System/Library/Frameworks/CoreGraphics.framework/Headers/CGContext.h:21:0,
from /System/Library/Frameworks/CoreGraphics.framework/Headers/CGBitmapContext.h:9,
from /System/Library/Frameworks/CoreGraphics.framework/Headers/CoreGraphics.h:11,
from /System/Library/Frameworks/ApplicationServices.framework/Headers/ApplicationServices.h:35,
from /Users/jakob/dev/MITK-sb-workbench-gcc/ep/src/VTK/ThirdParty/freetype/vtkfreetype/src/base/ftmac.c:101,
from /Users/jakob/dev/MITK-sb-workbench-gcc/ep/src/VTK/ThirdParty/freetype/vtkfreetype/src/base/ftbase.c:38:
/System/Library/Frameworks/CoreGraphics.framework/Headers/CGPath.h:391:15: error: expected identifier or '(' before '^' token
typedef void (^CGPathApplyBlock)(const CGPathElement * element);
^
/System/Library/Frameworks/CoreGraphics.framework/Headers/CGPath.h:393:53: error: unknown type name 'CGPathApplyBlock'
CG_EXTERN void CGPathApplyWithBlock(CGPathRef path, CGPathApplyBlock CF_NOESCAPE block)Installing clang 5.0.1 would allow using OpenMP, however, the MITK build (target: workbench-release) fails with the following error:
CMake Error at Applications/Matcher/CMakeLists.txt:11 (target_compile_features): target_compile_features no known features for CXX compiler "Clang" version 5.0.1.
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Is there some kind of intended replacement for clang? What is the go-to way for other tools?
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Alternative is to install clang via Homebrew:
brew install llvm
One have to change the C and CXX compiler in CMake to something like /usr/local/opt/llvm/bin/clang and maybe set some more paths. See http://antonmenshov.com/2017/09/09/clang-openmp-setup-in-xcode/.
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