Getting And Building MPICH
Checking out the MPICH2 source
To checkout a new copy of the MPICH2 source, use
svn co https://svn.mcs.anl.gov/repos/mpi/mpich2/trunk mpich2
Setting up the build environment
The SVN repository does not contain any of the "derived" files, including the configure scripts and the C++ and Fortran 77 language bindings.
To build these, run
Occasionally changes are made to the autoconf macros that are not detected by the dependency tests for the configure scripts. It is always correct to delete all of the configure scripts before running maint/updatefiles:
find . -name configure -print | xargs rm ./maint/updatefiles
The autoconf macros and the configure.in scripts now require autoconf version 2.63 (exactly). This was done because there are incompatible differences between each minor release of autoconf (even the allowed command line arguments has changed between 2.50 and 2.58).
You can select a particular version of autoconf and autoheader by using the environment variables AUTOCONF and AUTOHEADER respectively. maint/updatefiles will use these if they are set. Enabling automatic handling of file dependencies
Under certain circumstances, the build system will automatically maintain dependency information, ensuring that changes to a header file, for example, forces the recompilation of all files that include that header file. The requirements are
- The C compiler is gcc, and
- Dependencies are enabled when simplemake was run by maint/updatefiles (this is the default for the development version but not the a release distribution).
To enable the dependencies, simply run
after the configure step. This will enable dependency handling for the parts of MPICH2 that use simplemake (e.g., src/mpi, src/mpid, and some parts of src/util). Other parts of MPICH2, such as ROMIO, do not currently support automatic dependency handling.
Updated derived files such as configure
If you change one of the files that is the source for a derived file, such as a configure.in file, you will need to rebuild the derived file (e.g., the corresponding configure file). The safest way to do this is to rerun updatefiles:
(from the top-level MPICH2 directory). However, this can take a fair amount of time. You can direct updatefiles to only update certain classes of files. For example, to update all configure files, use
You can use multiple -do arguments. For example, to rebuild the Makefile.in files and the configure files, use
./maint/updatefiles -do=build_configure -do=makefiles
Check the source of maint/updatefiles to see what other options are available for -do.