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Re: Trying to get libtool not to add -rpath, since libs are only in a st

From: Filipe Brandenburger
Subject: Re: Trying to get libtool not to add -rpath, since libs are only in a staging directory
Date: Tue, 2 Dec 2014 13:45:34 -0800

Hi Gary, Bob,

Thanks for your feedback!

In the end, I found Roumen Petrov replied to the list indicating that
setting lt_cv_sys_lib_dlsearch_path_spec when calling configure might
be able to solve this and indeed it did.

By passing lt_cv_sys_lib_dlsearch_path_spec="${stagedir}/usr/lib" (I'm
not linking to anything under the system's /usr/lib so it's OK for me
to omit it) I managed to get it not to add that directory to the

I wish that this "sys_lib_dlsearch_path_spec" variable was better
documented in libtool's documentation... I'd be happy to try to
contribute but unfortunately I don't think I understand them well
enough to give them a good description... Let me know if you think I
could help with it anyhow.

Replying to some of your comments:

On Fri, Nov 28, 2014 at 10:37 AM, Bob Friesenhahn
<address@hidden> wrote:
> I am not sure what OS is being discussed here since it was never mentioned.

This is on GNU/Linux and I'm using either the GNU ld and the gold
linker (ideally I want both to work.) Both seem to support -rpath and
-rpath-link but that doesn't seem to be part of the problem (as just
adding the directory to lt_cv_sys_lib_dlsearch_path_spec was enough to
solve it.)

> GNU ld on GNU/Linux has these options:
>   -rpath PATH                 Set runtime shared library search path
>   -rpath-link PATH            Set link time shared library search path
> Notice that one is the path used for the installed library and the other is
> for linking.  It is more correct to use -rpath-link for libraries which are
> not in their final resting place.  However, the libraries do remember the
> -rpath-link option which was used when they were linked, and libraries
> linked with them inherit the option (to support cascading linkage).

So in my actual case I'm installing libraries to a ${GNU_PLATFORM}
subdirectory of /usr/lib where ${GNU_PLATFORM} is set to the GNU

So, I'm actually passing ./configure both the
variable and also LDFLAGS="-Wl,-rpath,/usr/lib/${GNU_PLATFORM}
-Wl,-rpath-link,${stagedir}/usr/lib/${GNU_PLATFORM}" which gets it to
*add* the -rpath I want and to link to the libraries in the correct

> I don't think that linking against libraries in DESTDIR is portable. DESTDIR
> should be considered an install/copy-only option to support packaging.

Well, in my use case I'm often/usually cross compiling so having the
final libraries installed under /usr/lib is not really an option... It
seems that lt_cv_sys_lib_dlsearch_path_spec solved the issue for me,
but I'm not 100% positive how portable that is, if you can think of
some reasons why this is not a good fix and if there's a cleaner way
to accomplish this then please let me know.


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