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From: iyzsong@member.fsf.org (=?utf-8?B?5a6L5paH5q2m?=)
Subject: Re: (dynamic-link "libm") doesn't work on guile
Date: Fri, 08 Jan 2016 11:27:49 +0800
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In-Reply-To: <87bn8x65i9.fsf@gmail.com> (Alex Vong's message of "Thu, 07 Jan
	2016 18:36:14 +0800")
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To: Alex Vong <alexvong1995@gmail.com>
Cc: help-guix@gnu.org

Alex Vong <alexvong1995@gmail.com> writes:

> Hi people,
>
>
> I got the following error message when trying to dlopen a shared library
> in ~/guix-profile/bin/guile installed by guix:
>
> scheme@(guile-user)> (dynamic-link "libm")
> ERROR: In procedure dynamic-link:
> ERROR: In procedure dynamic-link: file: "libm", message: "file not found"
>
> Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
>
>
> I think it is a guix-specific problem since /usr/bin/guile installed by
> debian works fine:
>
> scheme@(guile-user)> (dynamic-link "libm")
> $1 =3D #<dynamic-object "libm">
The `dynamic-link` will search and dlopen the shared library.  The guile
from guix doesn=E2=80=99t search common places like =E2=80=98/usr/lib=E2=80=
=99, so you need to
set the environment variable `LD_LIBRARY_PATH` or `LTDL_LIBRARY_PATH`
explicitly to the directory contains `libm.so`.

by the way, since guile is linked with libm.so, we can just use
`(dynamic-link)` here.

well, I also find `(dynamic-link "libm-2.22")` work too, but it doesn=E2=80=
=99t
seem to be what we want to use.