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Bug#484277: Problem appears to be sys_lib_dlsearch_path_spec



http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=367115#10

/usr/$arch/lib is already set in sys_lib_search_path_spec via the
cross-compiler and --print-search-dirs, however, rpath persists.

After a little investigation with the Emdebian Crush builds, I got this
summary of the problems:

http://wiki.debian.org/EmdebianAuditRpath

I've only tested changes in a few packages but one thing that is
promising is adding the /usr/$arch/lib path to
sys_lib_dlsearch_path_spec as well as the existing setting in
sys_lib_search_path_spec causes libtool (and therefore make) to omit
any call to rpath when relinking the binary at the build stage. Doing
this via the cross-compiler will allow more arbitrary rpaths to be
allowed for useful purposes in upstream development.

Are there likely side-effects from this change?

The difference is that sys_lib_search_path_spec has abspath support to
handle the long-winded way that arm-linux-gnueabi-gcc outputs the
search directories:

libraries:
=/usr/lib/gcc/arm-linux-gnueabi/4.3.3/:/usr/lib/gcc/arm-linux-gnueabi/4.3.3/../../../../arm-linux-gnueabi/lib/arm-linux-gnueabi/4.3.3/:/usr/lib/gcc/arm-linux-gnueabi/4.3.3/../../../../arm-linux-gnueabi/lib/

That last one resolves to the /usr/$arch/lib/

$ realpath /usr/lib/gcc/arm-linux-gnueabi/4.3.3/../../../../arm-linux-gnueabi/lib/
/usr/arm-linux-gnueabi/lib

For dlsearch to gain the same listing, it will also need abspath support.

The problems appear to show up in packages that build against libraries
other than plain libc6 - simple packages that have no other build-dependencies only show an rpath to /usr/lib in the build log which libtool then removes. I think we need the same behaviour for /usr/$arch/lib.

(Note, this does need to come from --print-search-dirs output of the cross-compiler as these paths are not fixed and may change in future.)

-- 


Neil Williams
=============
http://www.data-freedom.org/
http://www.linux.codehelp.co.uk/
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