I think that's not true. I can use OpenMP with AppleClang, following this post (https://iscinumpy.gitlab.io/post/omp-on-high-sierra/), so it's doable. The only problem is cmake can't find AppleClang's OpenMP support correctly.

I could actually let CMake found OpenMP, using Homebrew's libomp.

Details are in the attached brew formula

$ brew install -vv ./gmt.rb

However compilation aborts at 42% with this error:

/tmp/gmt-20191102-74335-1w0o76o/gmt-6.0.0/src/grdlandmask.c:649:2: error: condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'row'
        gmt_M_grd_loop (GMT, Grid, row, col, ij) {      /* Turn levels into mask values */
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/gmt-20191102-74335-1w0o76o/gmt-6.0.0/src/gmt_grd.h:165:40: note: expanded from macro 'gmt_M_grd_loop'
#define gmt_M_grd_loop(C,G,row,col,ij) gmt_M_row_loop(C,G,row) gmt_M_col_loop(C,G,row,col,ij)
                                       ^~~~~~~~~~~~~~~~~~~~~~~
/tmp/gmt-20191102-74335-1w0o76o/gmt-6.0.0/src/gmt_grd.h:163:47: note: expanded from macro 'gmt_M_row_loop'
#define gmt_M_row_loop(C,G,row) for (row = 0; (int)row < (int)G->header->n_rows; row++)
                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

OpenMP support on macOS #1926

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