View source for Getting And Building MPICH

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== Checking out the MPICH2 source ==

To checkout a new copy of the MPICH2 source, use

 <nowiki>svn co https://svn.mcs.anl.gov/repos/mpi/mpich2/trunk mpich2</nowiki>

== 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

 ./autogen.sh

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 autogen.sh:

 find . -name configure -print | xargs rm
 ./autogen.sh

The autoconf macros and the configure.in scripts now require the following:

* '''autoconf version 2.67 (or higher)'''
* '''automake version 1.11 (or higher)'''
* '''GNU libtool version 2.2.6 (or higher)'''

This was done because there are incompatible differences between each minor release of autoconf (e.g. 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. autogen.sh will use these if they are set.  However, note that for these tools to work properly, both they and 
all of there data files must be installed in the same set of directories.  The easiest way to ensure this is to use ''exactly'' the same configure arguments when you configure and install these tools.  For example, if you set the '''prefix''', set the prefix to exactly the same path for all three tools.  

== 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 autogen.sh:

 ./autogen.sh

(from the top-level MPICH2 directory). However, this can take a fair amount of time. You can direct autogen.sh to only update certain classes of files. For example, to update all configure files, use

 ./autogen.sh -do=build_configure

You can use multiple -do arguments. For example, to rebuild the Makefile.in files and the configure files, use

 ./autogen.sh -do=build_configure -do=makefiles

Check the source of autogen.sh to see what other options are available for -do.

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