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Intel Compilers (Fortran, C/C++)

The different versions of the Intel compilers available on Jean Zay can be activated using the module command.

Example of loading:​

$ module avail intel-compilers
---------------------- /lustre/fshomisc/sup/hpe/pub/module-rh/modulefiles ----------------------
intel-compilers/16.0.4  intel-compilers/19.0.2  intel-compilers/19.1.0  intel-compilers/19.1.3
intel-compilers/18.0.1  intel-compilers/19.0.4  intel-compilers/19.1.1  intel-compilers/2021.9.0
intel-compilers/18.0.5  intel-compilers/19.0.5  intel-compilers/19.1.2

$ module load intel-compilers/19.0.4

$ module list
Currently Loaded Modulefiles:
 1) intel-compilers/19.0.4

Here are the compilation commands for Fortran, C and C++:

LanguagesCommandSource file suffixes
Fortranifort.f90: free format; .F90: free format, pre-compiled by fpp .f, .for, or .ftn: fixed format; .fpp, .F, .FOR, .FTN, or .FPP: fixed format, pre-compiled by fpp
Cicc.c, .i
C++icpc.C, .cxx, .c++, .cc, .cp, .cpp

Examples of executable generation:​

After loading the desired version of the Intel compilers, simply call the corresponding command to generate your executable:

ifort prog.f90 -o prog
icc prog.c -o prog
icpc prog.C -o prog

Notes on the format of the Fortran source code​

By default, the Intel compilers determine the format of the source code based on the file name suffix. However, the format of the source code can be explicitly specified using the option -free (free format) or -nofree (fixed format). It should be noted that the fixed format is considered obsolete since the Fortran 95 standard.

For example:

  • if prog.f90 contains source code written in free format : ifort prog.f90 -o prog
  • if prog.f90 contains source code written in fixed format : ifort -nofree prog.f90 -o prog
  • if prog.f contains source code written in fixed format : ifort prog.f -o prog
  • if prog.f contains source code written in free format : ifort -free prog.f -o prog