Compilation fails on macOS Sonoma with homebrew gcc-13.2

Support
1

Hello,

I am trying to compile Paraview with gcc 13.2.0 (homebrew gcc), OpenMPI 4.1.1 on macOS Sonoma and VTK compilation is failing with the following error message:

/paraview/VTK/Rendering/UI/vtkCocoaMacOSXSDKCompatibility.h:71:20: error: missing binary operator before token "("
   71 | #elif __has_feature(objc_arc)
      |                    ^
/Users/absingh/git/paraview/VTK/Rendering/UI/vtkCocoaMacOSXSDKCompatibility.h:81:18: error: missing binary operator before token "("
   81 | #if __has_feature(objc_arc)
      |                  ^

Any advice would be helpful.

2

Which version of VTK? master ?

FYI @seanm @dgobbi

3

The __has_feature() builtin is clang-only, it doesn’t exist on gcc.

I haven’t heard of anyone trying to build VTK on macOS with gcc recently, you might have to do a lot changes to the code to make it work. Both gcc and clang are free compilers, but clang gets a lot of support from Apple, while gcc does not.

4

Thank you so much for the fast response!
In general my projects also use gfortran (for standard linear algebra libraries). As an aside, I would like to ask if there are issues if clang is used along side gfortran and if extra care should be taken in general?

5

This should be something like:

#elif __has_builtin(__has_feature)
#if __has_feature(objc_arc)
#endif
#else

because GCC recognizes __has_feature as special, but not all modes “understand” it properly. Since it’s a parser-like thing, it cannot be guarded with a && short-circuit.

6

No, there’s no issue AFAIK. We do this for the ParaView binaries (where Fortran is used to compile NumPy, SciPy, and a few other projects).