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mpif77(1)                             MPI                            mpif77(1)


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 runnning 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 optoin 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
       -mpe=name
              - Use an MPE profiling library.  The behavior is similar to
              using -profile=mpe_name.conf .

       -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 MPICH2 with the new compiler and installing
       MPICH2 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, mpif90, mpiexec


LOCATION

       src/env/mpif77.txt

                                   11/2/2007                         mpif77(1)

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