Hi Ralf, Am 2/20/2011 7:55 AM, schrieb Ralf Wildenhues: > Hi Christian, Markus, > > * Christian Rössel wrote on Fri, Feb 18, 2011 at 03:57:30PM CET: >> AC_OPENMP returns "none needed" for the IBM xl Fortran compilers (xlf*, >> bgxlf*, mpixlf*). This is wrong, you need to use -qsmp=omp. >> >> configure tries to compile following program: >> >> | program main >> | call omp_get_num_threads >> | end >> >> Compilation succeeds without specifying any OpenMP flag. If you modify >> the test program to >> >> program main >> implicit none >> !$ integer tid >> tid = 42 >> call omp_set_num_threads(2) >> end >> >> the correct flags are detected. > > Thanks for the bug report and patch. I have one question (and I'd still > like to do some testing before pushing): Isn't the '!' line a Fortran > 90 comment, and doesn't that have to be written differently for pure > Fortran 77? you are right, a '!' is usually a comment in Fortran. But in the context of OpenMP and combined with the '$' it is interpreted as a conditional compilation sentinel, i.e. if no OpenMP flags are passed to the compiler, the line is interpreted as a comment, otherwise '!$' is replaced by two spaces and the line gets compiled. See 2.2.1 and 2.2.2 in the OpenMP specification (http://www.openmp.org/mp-documents/spec30.pdf). The patch should work for Fortran 77 and 90. Regards, Christian >> See the attached patch where I also >> added OpenMP flags for the Cray and NEC compilers. If you are happy with >> this patch, please add Markus Geimer to THANKS, too. > > Yes, that part is quite obviously good (it has a near-zero chance of > regressing anything!). > > Thanks, > Ralf _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
