Error with Ambiguous interfaces for generic procedure

Accelerated Computing HPC Compilers Legacy PGI Compilers
1

Hello,

I have some Fortran code that compiles with the gfortran, Cray, Intel and IBM compilers but not with PGI (v. 15.1).

I have an interface to some logging routines:

  interface model_write_log
     module procedure write_log_a, write_log_ir, &
                      write_log_i, write_log_r
  end interface

  subroutine write_log_r(fmtstr, fvar)
    use iso_fortran_env, only : output_unit ! access computing environment
    implicit none
    character(len=*), intent(in) :: fmtstr
    real(wp),         intent(in) :: fvar

and some code that attempts to call the logging routine:

  real(wp) :: chksum
  character(len=30) :: log_fmt
  ...
  chksum = 10.4
  write(log_fmt, "((A))") "('ua checksum = ',E16.8)"
  call model_write_log(log_fmt,  chksum)

I compile with -O3 only and get the error:

pgf90 -O3 -I../api_v1.0 -c nemolite2d.f90
PGF90-S-0155-Ambiguous interfaces for generic procedure model_write_log (nemolite2d.f90: 109)

Am I missing something here or is this a problem with the compiler?

Many thanks,

Andy.

2

Hi Andy,

Given it works with the other compilers, it’s more likely that we’re doing something wrong. Though I can’t tell without a reproducing example.

Can you either post or send to PGI Customer Service (trs@pgroup.com) an example we can use to diagnose the problem?

Thanks,
Mat

3

Hi Matt,

I’ve sent in a test case to the email address you supplied. In generating this case I’ve realised that I have duplicated the code for the routine in question (model_write_log) in two separate modules. However, because I’m using the ‘only’ qualifier when I ‘use’ different routines from those modules there shouldn’t be any ambiguity.

Thanks,

Andy.

4

Andrew,

The example fails with 15.4 and 15.6, but appears fixed in the current 15.7 release. I can see several TPRs that were resolved, involved in making this work.


15.7
% make
pgf90 -I./ -c kind_params_mod.f90
pgf90 -I./ -c gocean_mod.F90
pgf90 -I./ -c gocean2d_io_mod.f90
pgf90 -I./ -c nemolite2d.f90
pgf90 -o go2d.exe nemolite2d.o kind_params_mod.o gocean_mod.o gocean2d_io_mod.o
danger4% go2d.exe
ua checksum = 0.10400000E+02
va checksum = 0.10400000E+02
Simulation finished!!


15.6
pgf90 -I./ -c kind_params_mod.f90
pgf90 -I./ -c gocean_mod.F90
pgf90 -I./ -c gocean2d_io_mod.f90
pgf90 -I./ -c nemolite2d.f90
PGF90-S-0155-Ambiguous interfaces for generic procedure model_write_log (nemolite2d.f90: 16)
PGF90-S-0155-Ambiguous interfaces for generic procedure model_write_log (nemolite2d.f90: 18)
0 inform, 0 warnings, 2 severes, 0 fatal for gocean2d
make: *** [nemolite2d.o] Error 2

gfortran
% gfortran -I./ -c kind_params_mod.f90
% gfortran -I./ -c gocean_mod.F90
% gfortran -I./ -c gocean2d_io_mod.f90
% gfortran -I./ -c nemolite2d.f90
% gfortran -o go2d_gfort nemolite2d.o kind_params_mod.o gocean_mod.o gocean2d_io_mod.o
% go2d_gfort
ua checksum = 0.10400000E+02
va checksum = 0.10400000E+02
Simulation finished!!

regards,
dave