A program can be compiled successfully, but not under gfortran??

[changks888]

Hi -

I am working on model comparison across various platform and computering environment.

A program can be compiled successfully using ifort, however I got some errors when I use gofrtran to compile it. (It can be compiled using gfortran in the Linux, but I am trying to compile it on a Mac.)

Below shows the errors:

gfortran main.o climate.o weather.o vegetation.o biogeochem.o initial.o humidity.o \\

radiation.o readpars.o canopy.o physiology.o snow.o soil.o utilities.o \\

ctemfire.o disturbance.o diagnostics.o io-cfs.o ies-io.o math.o stats.o nag-soil.o \\

-ffixed-line-length-132 -I/usr/local/include -L/usr/local/lib -lnetcdff -o ibis

Undefined symbols for architecture x86_64:

"_time_", referenced from:

_MAIN__ in main.o

ld: symbol(s) not found for architecture x86_64

collect2: ld returned 1 exit status

make: *** [ibis] Error 1

bash-3.2$

I really appreciate your solutions and suggestions. Please help me.

Michael

[Steven_L_Intel1 · Accepted solution]

The error you show is from linking, not compiling. It looks as if you are referencing a function named TIME which is not provided. TIME is provided as a generic intrinsic subroutine by Intel Fortran, but it is an extension, perhaps one that gfortran does not support. If portability is a goal, use the DATE_AND_TIME standard intrinsic instead. Read about it in the documentation.

[changks888]

Good hint! The original time function was dtime in gfortran. Thanks Steve!!!

[TimP]

dtime() and etime() were legacy precursors to the f95 intrinsic cpu_time, which could be used to replace them.