Re: [Gretl-devel] Problem compiling and running Gretl CVS in Mac OS X 10.6

On Sun, 21 Mar 2010, Berend Hasselman wrote: ..... > However, running my bold of cvs gretl results in the following > error on startup (and gretl quits): > > ----------------------------------------------------------------------------------------------- > dyld: lazy symbol binding failed: Symbol not found: _omp_get_wtime > Referenced from: /Users/berendhasselman/tmp/gretl-image/Gretl.app/Contents/Resources/bin/../lib/libgretl-1.0.0.dylib > Expected in: flat namespace > > dyld: Symbol not found: _omp_get_wtime > Referenced from: /Users/berendhasselman/tmp/gretl-image/Gretl.app/Contents/Resources/bin/../lib/libgretl-1.0.0.dylib > Expected in: flat namespace > > Trace/BPT trap > ----------------------------------------------------------------------------------------------- > > I have also tried the option --disable-openmp of configure. > Same result. > This must have something to do with the recent changes wrt openmp. > > What's going on and what could be done about this (if at all possible)? The use of omp_get_wtime(), in gretl_utils.c, is conditional on _OPENMP being defined. So it seems there are two things to look at here: 1. At present, in CVS, openmp is used if the configure check for its presence goes OK. In that case the compiler flag -fopenmp will be added, in consequence _OPENMP should be defined, and the symbol omp_get_wtime will be required. With gcc on Linux this is handled automatically: the program is linked against libgomp. Apparently it's not handled automatically on OS X; we'll have to find out what's needed.

2. If you tell configure to "--disable-openmp", then it seems to me that the flag -fopenmp should not be added, _OPENMP should therefore not be defined, and so the symbol omp_get_wtime should not be required. What's going wrong with that? Can you check lib/Makefile after configuring with --disable-openmp? There will be a line OMP_OPT = and it should look as above, with nothing to the right of the equals sign.