Readline is a package which has no dependences other than BASE (see
$SAGE_ROOT/spkg/standard/deps). So it can be built very early - before Python.
This is part of the log from a successful installation of readline.
=================================================================
-bash-4.1$ tail spkg/logs/readline-6.0.p2.log
make[2]: Leaving directory
`/home/users/drkirkby/sage-4.6.alpha1/spkg/build/readline-6.0.p2/src'
real 8m1.326s
user 4m33.895s
sys 0m50.145s
Successfully installed readline-6.0.p2
Now cleaning up tmp files.
Making Sage/Python scripts relocatable...
python: No such file or directory
Finished installing readline-6.0.p2.spkg
==================================================================
Notice two of the last last 3 lines above say
Making Sage/Python scripts relocatable...
python: No such file or directory
William created
http://trac.sagemath.org/sage_trac/ticket/9507
to check that SAGE_LOCAL/bin/python exists before running any packages that have
spkg-install in them, but there's nothing to stop Sage trying to run python
scrips before Python is installed.
As we found on bsd.math, a slightly broken version of Python caused all sorts of
problems when sage_fortran got screwed up.
Clearly Python is not installed on this system, as we can test in two ways.
1) The portable (POSIX compatible test)
-bash-4.1$ command -v python
2) The non-portable (non POSIX) test you are probably more familiar with.
-bash-4.1$ which python
which: 0652-141 There is no python in /opt/pware/bin /usr/bin /etc /usr/sbin
/usr/ucb /home/users/drkirkby/bin /usr/bin/X11 /sbin ..
So there's no Python installed on this system, but Sage has generated messages
that python does not exist, and that its making Sage/Python scripts relocatable,
before it has built Python.
This I believe is a bug, which was unsurprisingly found when trying to build
Sage on a less popular operating system (AIX).
Dave
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