NAME

       mpicxx -  Compiles and links MPI programs written in C++

DESCRIPTION

       This command can be used to compile and link MPI programs written in C++.  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
       -cxx=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 mpicxx
              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 mpicxx.
       -link_info
              - Show the steps for linking a program.  This  option  can  be  used  to  see  what
              options and libraries are used by mpicxx.
       -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.
       -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_CXX  may  be  used to select different C++ compiler and
       linker.  Note that since MPICH is built with a particular C and Fortran compiler, changing
       the  compilers used can cause problems.  Use this only if you could intermix code compiled
       with the different compilers.

       The environment variable MPICC_PROFILE specifies a profile library and has the same effect
       as  if  -profile=$MPICC_PROFILE were used as an argument to mpicc .  See the discussion of
       -profile below for more details.

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_CXX environment variable or the -cxx=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.c , use
       mpicxx -c foo.cxx

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

       Combining compilation and linking in a single command
       mpicxx -o foo foo.cxx

       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, mpifort, mpiexec

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