new build system

[Satish Balay]

On Wed, 13 Jun 2007, Lisandro Dalcin wrote:

> I am using Fedora Core 6, I've installed ATLAS rpm, see the contents:

gcc, python are representative of packages that can have multiple
version installed simultaneously.

/usr/bin/python2.4
/usr/include/python2.4/Python.h
/usr/lib/python2.4/os.py
/usr/lib/python2.4/config/Makefile
/usr/lib/python2.4/config/Setup


/usr/lib/gcc/i386-redhat-linux/4.1.1/include/float.h
/usr/lib/gcc/i386-redhat-linux/3.4.6/include/float.h

/usr/lib/gcc/i386-redhat-linux/4.1.1/libgcc.a
/usr/lib/gcc/i386-redhat-linux/3.4.6/libgcc.a

etc..

One major difference they have [wrt PETSc] is the internals are not
directly accessed by users. Only the binaries are.  So just having
gcc, gcc34 as 2 binaries is sufficient to distinguish these 2 packages
[and these wrappers know the internal paths to the correct version of
libraries]

Satish