NAME

       mpif77 -  Compiles and links MPI programs written in Fortran 77

DESCRIPTION

       This  command  can  be used to compile and link MPI programs written in Fortran.  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
       -f77=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 mpif77 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 mpif77.
       -link_info
              - Show the steps for linking a program.  This option can be used to see what options and libraries
              are used by mpif77.
       -profile=name
              - Use the MPI profiling given by name.  See below for details
       -echo  - Show exactly what this program is doing.  This option should normally not be used.
       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_F77 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 interchangably.  There are exceptions; if you use the MPICH_F77 environment
       variable or the -f77=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 installation manual for more details.

EXAMPLES

       To compile a single file foo.f , use
       mpif77 -c foo.f

       To link the output and make an executable, use
       mpif77 -o foo foo.o

       Combining compilation and linking in a single command
       mpif77 -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 libmyprof.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

                                                    11/9/2015                                          mpif77(1)