Jan Kratochvil - Re: [RFA] ignore PYTHONHOME environment variable. (original) (raw)

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• From: Jan Kratochvil
• To: Joel Brobecker
• Cc: Doug Evans , gdb-patches at sourceware dot org, David Malcolm , Tom Tromey , Ben Woodard
• Date: Fri, 18 May 2012 21:33:52 +0200
• Subject: Re: [RFA] ignore PYTHONHOME environment variable.
• References: 1290474202-885-1-git-send-email-brobecker@adacore.com 20101123030037.GA19962@host0.dyn.jankratochvil.net <AANLkTiko2FVL+ktF9JTBRedYz_wvsq_eP4rU3rLcOYmF@mail.gmail.com> 20101123163045.GA1737@host0.dyn.jankratochvil.net AANLkTi=W+PnwOfNkRRe5OMz0qm5vCghhduO5ve1Qk3zH@mail.gmail.com 20101123173054.GW2634@adacore.com 20101214071210.GQ2596@adacore.com 20101214092645.GA20415@host0.dyn.jankratochvil.net 20101214103305.GU2596@adacore.com

On Tue, 14 Dec 2010 11:33:05 +0100, Joel Brobecker wrote:

What we can also do is warn users when we see that PYTHONHOME is defined and not GDB_PYTHON_HOME. That way, they are not surprised when that happens, and they get a helpful indication of how to remedy the problem.

Therefore:

if ($GDB_PYTHONHOME exists) { use it } else if ($PYTHONHOME exists) { warn on it ignore it pass it to spawned debuggees } else { let Python use it's defaults }

That "ignore it" part may be difficult as despite Py_SetPythonHome overrides $PYTHONHOME if !defined WITH_PYTHON_PATH we do not know which string to use for Py_SetPythonHome to override it. So maybe to use unsetenv before Py_Initialize and setenv the saved string back afterwards.

Also I believe it should apply to any environment starting with PYTHON* as besides $ PYTHONHOME=/foo ./gdb ImportError: No module named site

it affects also at least $ echo foo >site.py; PYTHONPATH=. ./gdb Traceback (most recent call last): File "./site.py", line 1, in foo NameError: name 'foo' is not defined

and $ PYTHONVERBOSE=1 ./gdb # installing zipimport hook import zipimport # builtin [...] import gdb.command.upto # precompiled from /usr/share/gdb/python/gdb/command/upto.pyc GNU gdb (GDB) 7.4.50.20120512-cvs [...]

Thanks, Jan

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    * From: Joel Brobecker