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.
- 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 interchangably. 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¶
mpif77, mpicc, mpif90, mpiexec
LOCATION¶
/tmp/gyCYfBi4J6/mpich-3.1/src/env/mpicxx.txt