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From: Maxime Devos
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Subject: Re: [PATCH] load-foreign-library: perform substring match on library
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From: Maxime Devos
To: soeren@soeren-tempel.net, bug-guile@gnu.org
Cc: guile-devel@gnu.org
Message-ID: <936e98a7-a9d2-2607-ef6a-8c0edff19c4a@telenet.be>
Subject: Re: [PATCH] load-foreign-library: perform substring match on library
files
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<20220723110919.30107-1-soeren@soeren-tempel.net>
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From: S=C3=B6ren Tempel <soeren@soeren-tempel.net>
This patch is a fix for bug #49232 [1]. To summarize this bug, the
current load-foreign-library implementation does not load versioned
sonames (e.g. libfoo.so.5) which are common on Linux. This is an issue
for us at Alpine Linux since we ship unversioned sonames (e.g. libfoo.so)=
separately. Please refer to the original bug report for details.
[...]
Long term, I think it would be ideal for Guile to decide upon a
major version (and maybe even location, depending on the choices
of the distro) at _compile_ time instead of runtime, not unlike
how other compilers work.
More concretely, we could have a macro 'link-foreign-library', of
the form:
(link-foreign-library library [maybe other arguments).
If the Guile module is being compiled with --rpath, it searches
$CROSS_LIBRARY_PATH or $LIBRARY_PATH and encodes the full file
name (/usr/lib/.../libguile-... or /gnu/store/.../lib/...) in the
.go, which avoids some manual patching we have to do in Guix.
It could also detect if it's loading a libfoo.so pointing to
libfoo.so.N, and if so, replace libfoo.so by libfoo.so.N.
The former (rpath) would work for Guix, and I expect the latter
(libfoo.so -> libfoo.so.N) to work on Alpine.
+(define (file-exists-in-d=
ir-with-extension dir basename exts)
+ (let* ((dir-stream (opendir dir))
+ (ret (let loop ((fn (readdir dir-stream)))
+ (and (not (eof-object? fn))
+ (if (filename-matches-with-extension? fn basename e=
xts)
+ (in-vicinity dir fn)
+ (loop (readdir dir-stream)))))))
IIUC, the string-prefix? search is non-deterministic, which can
make debugging complicated when multiple versions are installed.=C2=
=A0
I think it would be better to bail out if there are multiple
matches instead of a risk of guessing incorrectly.
The prefixing behaviour is also not documented, so some
documentation is needed in the manual.
Questions:
- Does it go scanning the dir even if libfoo.so could be found?=C2=
=A0
Otherwise, there are some possible performance gains by checking
for libfoo.so first -- consider the case where /usr/lib is huge.<=
br>
- When doing (load-foreign-library "/gnu/store/.../libfoo.so")
(absolute file name!), would it search for
/gnu/store/.../libfoo.so.N?=C2=A0 If so, that would be surprising=
,
especially if libfoo.so.N exists.
- If doing libfoo.so.N, will it search for libfoo.so.N.M?
- Does it only apply to the system paths, or also to
GUILE_SYSTEM_EXTENSION_PATH, LTDL_LIBRARY_PATH and
GUILE_EXTENSION_PATH? The latter would be surprising to me, as
versioning is more of a system thing.
- To test it, and avoid breaking things later with future
changes to load-foreign-library, could some tests be added?
- Is this change desirable?=C2=A0 I mean, this is an FFI API, so =
the
ABI of the library is rather important. If a Guile module links
to libfoo.so, and they had version N in mind, then it's
important it doesn't link to N-1 or N+1 instead, because of ABI
incompatibilities. As such, to me it seems _good_ that you got
some errors, as now you get a reminder to explicitly state which
ABI version is needed. (YMMV, and the mileage of the Guile
maintainers might vary, etc.)
Also, this seems like a non-trivial change to me, so a copyright
line might be in order, unless you did the copyright assignment.
Greetings,
Maxime.
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