Don't "import site" in sympy's installer

[jdemeyer]

Since #12329, sympy might be installed after the Sage library. The sympy setup.py imports lots of stuff, including sage itself. This is obviously not good, since not all of Sage has been built. Possible consequences include segmentation faults or sage-cleaner being started.

The solution is to start setup.py with python's -S option to start Python with a minimal sys.path.

spkg: http://boxen.math.washington.edu/home/jdemeyer/spkg/sympy-0.7.1.p0.spkg

Component: packages: standard

Author: Jeroen Demeyer

Reviewer: William Stein

Merged: sage-5.0.beta6

Issue created by migration from https://trac.sagemath.org/ticket/12563

[jdemeyer]

Attachment: sympy-0.7.1.p0.diff.gz

Diff for the sympy spkg, for review only

[williamstein]

comment:4

Instead of a comment that sagelocal is defined, why not check it and exit with an error if it is not defined?

[jdemeyer]

comment:5

Replying to @williamstein:

Instead of a comment that sagelocal is defined, why not check it and exit with an error if it is not defined?

That's precisely what's happening in lines 3--7 of spkg-install.

[jdemeyer]

Reviewer: William Stein

[jdemeyer]

Merged: sage-5.0.beta6