Compiling YAC with faulty Fortran compiler (incorrect intrinsic is_contiguous)

PIK reported that when building YAC to be used in PISM the AMD Optimizing C/C++ and Fortran Compilers (AOCC) causes problems when compiling the Fortran code in YAC.

PISM itself has no use for the YAC Fortran interface.

added compiling label

assigned to @k202077

We now use the aocc-4.2.0 with a spack recipe. The error message attached [0] was still with aocc-4.1.0.

The error already occurred during ./configure step during the test is_contiguous() [1], or more specifically the test of ptrs(3) [2].

We came up with a workaround, namely to skip the test with ./configure yac_cv_fc_is_contiguous_works=yes [...], similar to [3] and [4].

Skipping the test in unpropematic for PISM, as it is only needed if data from FORTRAN code were passed to YAC [5].

0(/uploads/7a6000480f5e4f4b0aebd9738b548c61/pism-spack-yac-failed.out) 1(https://gitlab.dkrz.de/dkrz-sw/yac/-/blob/master/configure.ac?ref_type=heads#L278-31) 2(https://gitlab.dkrz.de/dkrz-sw/yac/-/blob/master/configure.ac#L299) 3(https://gitlab.dkrz.de/dkrz-sw/yac/-/blob/master/.gitlab-ci.yml#L507) 4(https://gitlab.dkrz.de/dkrz-sw/yac/-/blob/master/config/git_add_dist.sh#L44) 5(https://gitlab.dkrz.de/dkrz-sw/yac/-/blob/master/src/mci/yac_global.F90#L65)

changed title from YAC compilation with AOCC fails to Compiling YAC with faulty Fortran compiler (incorrect intrinsic is_contiguous)

There are surprisingly many Fortran Compilers that have a faulty implementation of intrinsic Fortran function is_contiguous.

This routine is used to make sure that an array provided by the user to the Fortran interface can be passed to C.

In case your Fortran compiler is faulty, but you are sure that your arrays are always contiguous in memory, you can overwrite the configure time check as described above by Torsten Albrecht.

Alternatively, with YAC v3.6.1 the configure argument --disable-fortran-bindings was introduced, which disables all Fortran checks and prevents the building of the Fortran interface of YAC.

Btw.: To build yaxt without a Fortran interface you have to provide FC=no to its configure.

changed the description