Building ACCESS-OM2 on Archer2 (UK HPC)

Aidan · 11 February 2026 06:24

Looking at the configure.ac:

lib/mct/configure.ac

2025.03.001

#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_INIT(MCT, 2.8)

# PROCESS THE FOLLOWING MAKEFILES
AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_FILES(Makefile.conf)
AC_CONFIG_HEADER(config.h)

# DECLARE PACKAGE OPTIONS

AC_ARG_ENABLE(mpiserial,
AC_HELP_STRING([--enable-mpiserial],
[Use the included MPI replacement library for single processor]),
[DONOTCHECKMPI="DONOTCHECKMPI"]
)

AC_ARG_ENABLE(debugging,
AC_HELP_STRING([--enable-debugging],

This file has been truncated. show original

and the output your pasted in (I’m seeing -DCPRCOMPAQ) it seems like autoconf thinks your Fortran compiler is COMPAQ. Welcome to 2015!

I don’t speak autoconf, but the fortran compilers it is trying to match against are ancient, and the only OPT flag it resolves to seems to be -fast.

@harshula would it be as simple as setting some flags here:

github.com/ACCESS-NRI/access-spack-packages

packages/oasis3-mct/package.py

main


      
          MAKE        = make
          # Consider adding following flags if breaks for gfortran > v10: -fdefault-real-8 -fdefault-double-8
          F90         = mpif90 -Wall -fallow-argument-mismatch -ffree-line-length-0
          CC          = gcc
          LD          = mpif90
          MCT_FCFLAGS =
          #
          # CPP keys and compiler options
          # 
          CPPDEF    = -Duse_netCDF -Duse_comm_$(CHAN) -D__VERBOSE -DTREAT_OVERLAY
          F90FLAGS_1  = 
          """
          
                  # module load intel-compiler/2019.5.281
                  config["intel"] = f"""
          # Compiling and other commands
          MAKE        = /usr/bin/make
          F90         = mpifort
          CC          = mpicc
          LD          = $(F90)

(in your local copy) so that autoconf doesn’t try and guess some?

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Building ACCESS-OM2 on Archer2 (UK HPC)

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