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  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
       -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, mpif90, mpiexec

LOCATION

       src/env/mpif77.txt

                                            4/24/2013                                   mpif77(1)