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Re: [RFC] python-config.py --ldflags should return relocated path to libpython
- From: Joel Brobecker <brobecker at adacore dot com>
- To: gdb-patches at sourceware dot org
- Date: Wed, 28 Jul 2010 10:23:39 -0700
- Subject: Re: [RFC] python-config.py --ldflags should return relocated path to libpython
- References: <1278627885-9416-1-git-send-email-brobecker@adacore.com>
> There are currently 2 issues, I think, with python-config --ldflags:
>
> 1. When python is configured with --enable-shared:
> -L<prefix>/lib is missing. This is a problem if python was
> installed in a non-standard location.
>
> 2. When Python is configured without --enable-shared:
> The path to the libpython archive is provided in the command output,
> but the path that gets returned is the path used at configure time.
> If the Python install was copied over to a different machine and
> then installed at a different location, then the path in -L<path>
> is incorrect (by comparison, python-config --cflags returns
> the location with the correct prefix).
[...]
> This patch should fix both situations. I will also send the patch
> upstream to the Python developers, to see what they say.
No comment either on the Python side or on the gdb-patches side.
> gdb/ChangeLog:
>
> * python/python-config.py: When --ldflags is specified, make sure
> that the paths printed are relative to the run-time prefix.
> Always provide the path to libpython, even when the python
> install provides a shared version of libpython.
I think it's too late for 7.2, but I would like to apply this patch
on the HEAD. Any objections? If we ever create a 7.2.1, and this patch
was shown to not cause any problem, then perhaps I'll consider it for
backporting on the 7.2 branch - if approved by the GMs.
> Tested on x86_64-linux, with 2.5 and 2.6. Briefly tested with 2.7,
> but only by running python-config.py and visually verifying the output.
>
> ---
> gdb/python/python-config.py | 15 ++++++++++++++-
> 1 files changed, 14 insertions(+), 1 deletions(-)
>
> diff --git a/gdb/python/python-config.py b/gdb/python/python-config.py
> index 0230eb4..aa4aea3 100644
> --- a/gdb/python/python-config.py
> +++ b/gdb/python/python-config.py
> @@ -50,8 +50,21 @@ for opt in opt_flags:
> # add the prefix/lib/pythonX.Y/config dir, but only if there is no
> # shared library in prefix/lib/.
> if opt == '--ldflags':
> + # Provide the location where the Python library is installed.
> + # We always provide it, because Python may have been installed
> + # at a non-standard location.
> if not getvar('Py_ENABLE_SHARED'):
> - libs.insert(0, '-L' + getvar('LIBPL'))
> + # There is no shared library in prefix/lib. The static
> + # library is in prefix/lib/pythonX.Y/config.
> + #
> + # Note that we cannot use getvar('LIBPL') like we used to,
> + # because it provides the location at build time, which might
> + # be different from the actual location at runtime.
> + libdir = sysconfig.get_python_lib(standard_lib=True) + '/config'
> + else:
> + # The Python shared library is installed in prefix/lib.
> + libdir = sysconfig.PREFIX + '/lib'
> + libs.insert(0, '-L' + libdir)
> libs.extend(getvar('LINKFORSHARED').split())
> print ' '.join(libs)
>
> --
> 1.7.1
--
Joel