setup.py only adds /prefix/lib, not /prefix/lib64

[pitrou]

BPO	14791
Nosy	@doko42, @jcea, @pitrou, @ned-deily, @davidmalcolm, @iritkatriel
Files	setup_lib64.patch setup.diff

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2012-05-12.16:40:42.512>
labels = ['3.10', 'type-bug', '3.8', '3.9', 'build']
title = 'setup.py only adds /prefix/lib, not /prefix/lib64'
updated_at = <Date 2020-11-07.10:02:02.370>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2020-11-07.10:02:02.370>
actor = 'iritkatriel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build']
creation = <Date 2012-05-12.16:40:42.512>
creator = 'pitrou'
dependencies = []
files = ['25551', '26313']
hgrepos = []
issue_num = 14791
keywords = ['patch']
message_count = 6.0
messages = ['160478', '160483', '164956', '164965', '380458', '380492']
nosy_count = 7.0
nosy_names = ['doko', 'jcea', 'pitrou', 'ned.deily', 'Arfrever', 'dmalcolm', 'iritkatriel']
pr_nums = []
priority = 'low'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue14791'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[pitrou]

setup.py adds <prefix>/lib to the list of directories where libraries are looked for, but not <prefix>/lib64. Patch attached.

[Arfrever]

It would be better to fix issue bpo-1294959 and use os.path.join(sys.prefix, sys.libdir).
IIRC some mips architectures need "/usr/lib32", while x32 architecture needs "/usr/libx32".

[doko42]

using sys.maxsize isn't safe for cross builds. it should at least guarded by 'if not cross_compiling'.

I still think that the preferred way to get the library dirs is to ask the compiler (patch attached), however this will add "incompatible" library dirs as well, at least for multilib'd gcc builds, and leading to linker warnings when building the extensions. At least when using gcc this should address the issue finding the lib32 and libx32 dirs.

[ned-deily]

Also OS X universal builds have many of the characteristics of a cross-build. In particular, one executable (like the python interpreter) can contain both 32-bit and 64-bit architecture files. So tests for 32-bit vs 64-bit at build time using the running compiler's arch are problematic. Another issue is the support for building with an OS X SDK. Basically, all /usr include and lib file paths used for searching in setup.py need to be prefixed by the SDK path if configured. There are some holes in this right now. I plan to fix them soon; it would better to have this issue resolved and applied first.

[iritkatriel]

Was this resolved by the fix for https://bugs.python.org/issue32059?

[Arfrever]

No.
setup.py still contains several hardcoded paths with "lib" (e.g. "/usr/local/lib", "/usr/lib/termcap").

There are also some places in setup.py which check both "lib64" and "lib", but such checks can possibly return incorrect results on multilib systems (when a library happens to be available for another ABI (32-bit vs 64-bit) but not ABI for which Python is being built).

[serhiy-storchaka]

setup.py no longer used to build CPython since 3.12 (see #94474).