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mpifort(1)			       MPI			      mpifort(1)

NAME
     mpifort -	Compiles and links MPI programs written in Fortran 90

DESCRIPTION
     This  command  can be used to compile and link MPI programs written in For-
     tran.  It provides the options and any special libraries that are needed to
     compile and link MPI programs.

     It is important to use this command, particularly when linking programs, as
     it provides the necessary libraries.

COMMAND LINE ARGUMENTS
     -show  - Show the commands that would be used without running them
     -help  - Give short help
     -fc=name
	    - Use compiler name instead of the default choice.	Use this only if
	    the compiler is compatible with the MPICH library (see below)
     -config=name
	    - Load a configuration file for a particular compiler.  This  allows
	    a single mpifort command to be used with multiple compilers.
     -compile_info
	    -  Show  the steps for compiling a program.  This option can be used
	    to see what options and include paths are used by mpifort.
     -link_info
	    - Show the steps for linking a program.  This option can be used  to
	    see what options and libraries are used by mpifort.
     -profile=name
	    - Use the MPI profiling given by name.  See below for details
     -echo  -  Show exactly what this program is doing.  This option should nor-
	    mally not be used.
     -static
	    - mpi - Use a statically compile MPI library, but  shared  libraries
	    for all of the other dependencies.
     others
	    -  are  passed  to	the  compiler or linker.  For example, -c causes
	    files to be compiled, -g selects compilation with debugging on  most
	    systems, and -o name causes linking with the output executable given
	    the name name .

ENVIRONMENT VARIABLES
     The  environment variables MPICH_FC may be used to select different Fortran
     compiler and linker.  Note that since MPICH is built with	a  particular  C
     and  Fortran  compiler,  change the compilers used can cause problems.  Use
     this only if you could intermix code compiled with the different compilers.

COMPATIBLE COMPILERS
     The MPI library may be used with any compiler that uses  the  same  lengths
     for basic data objects (such as long double ) and that uses compatible run-
     time  libraries.  On many systems, the various compilers are compatible and
     may be used interchangeably.  There are exceptions; if you use the MPICH_FC
     environment variable or the -fc=name command-line argument to override  the
     choice of compiler and encounter problems, try reconfiguring MPICH with the
     new  compiler and installing MPICH in a separate location.  See the instal-
     lation manual for more details.

EXAMPLES
     To compile a single file foo.f , use
     mpifort -c foo.f

     To link the output and make an executable, use
     mpifort -o foo foo.o

     Combining compilation and linking in a single command
     mpifort -o foo foo.f

     is a convenient way to build simple programs.

SELECTING A PROFILING LIBRARY
     The -profile=name argument allows you to specify an MPI  profiling  library
     to be used.  name can have two forms:

     A library in the same directory as the MPI library
     The name of a profile configuration file

     If name is a library, then this library is included before the MPI library.
     This  allows the simple use of libraries that make use of the MPI profiling
     interface and that are installed in the same directory as the MPI library.

     If name.conf is the name of a file in the sysconfdir directory,  then  this
     is read and may define the following variables:
     PROFILE_PRELIB
	    - Libraries (and paths) to include before the MPI library
     PROFILE_POSTLIB
	    - Libraries to include after the MPI library
     PROFILE_INCPATHS
	    - C preprocessor arguments for any include files For example, to add
	    /usr/local/myprof/include  to  the include path and the library lib-
	    myprof.a in /usr/local/myprof/lib to the link step, you could create
	    the file myprof.conf with the lines

	    PROFILE_PRELIB="-L/usr/local/myprof/lib -lmyprof"
	    PROFILE_INCPATHS="-I/usr/local/myprof/include"

	    and place it in the sysconfdir directory (this directory is  set  at
	    configure  time  when  MPICH is built).  Then using the command-line
	    argument -profile=myprof will cause these definitions to be added to
	    the relevant compile commands.

SEE ALSO
     mpicc, mpicxx, mpifort, mpiexec

				    4/10/2026			      mpifort(1)

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