* Adding line to ld.so.conf @ 2011-11-21 15:35 Marc Ferland 2011-11-21 16:04 ` Khem Raj 2011-12-02 16:08 ` Michael E Brown 0 siblings, 2 replies; 6+ messages in thread From: Marc Ferland @ 2011-11-21 15:35 UTC (permalink / raw) To: yocto [-- Attachment #1: Type: text/plain, Size: 119 bytes --] Hi, What's the proper way to add a line to the ld.so.conf file for a new library I am adding? Regards, Marc [-- Attachment #2: Type: text/html, Size: 138 bytes --] ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Adding line to ld.so.conf 2011-11-21 15:35 Adding line to ld.so.conf Marc Ferland @ 2011-11-21 16:04 ` Khem Raj 2011-11-21 16:17 ` Marc Ferland 2011-12-02 16:08 ` Michael E Brown 1 sibling, 1 reply; 6+ messages in thread From: Khem Raj @ 2011-11-21 16:04 UTC (permalink / raw) To: Marc Ferland; +Cc: yocto On Mon, Nov 21, 2011 at 7:35 AM, Marc Ferland <marc.ferland@gmail.com> wrote: > Hi, > > What's the proper way to add a line to the ld.so.conf file for a new library > I am adding? > if the libraries is in standard paths you dont have to add it but if its in a special path then just add the absolute path to the library e.g. /opt/lib if your library is in /opt/lib and then run ldconfig > Regards, > > Marc > > _______________________________________________ > yocto mailing list > yocto@yoctoproject.org > https://lists.yoctoproject.org/listinfo/yocto > > ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Adding line to ld.so.conf 2011-11-21 16:04 ` Khem Raj @ 2011-11-21 16:17 ` Marc Ferland 2011-11-21 16:39 ` Mark Hatle 0 siblings, 1 reply; 6+ messages in thread From: Marc Ferland @ 2011-11-21 16:17 UTC (permalink / raw) To: Khem Raj; +Cc: yocto [-- Attachment #1: Type: text/plain, Size: 661 bytes --] On Mon, Nov 21, 2011 at 11:04 AM, Khem Raj <raj.khem@gmail.com> wrote: > On Mon, Nov 21, 2011 at 7:35 AM, Marc Ferland <marc.ferland@gmail.com> > wrote: > > Hi, > > > > What's the proper way to add a line to the ld.so.conf file for a new > library > > I am adding? > > > > if the libraries is in standard paths you dont have to add it but if > its in a special path > then just add the absolute path to the library e.g. /opt/lib if your > library is in /opt/lib > and then run ldconfig > What I meant was how to do it in a recipe file. I don't want to modify ld.so.conf and run ldconfig each time I create a new image. Regards, Marc [-- Attachment #2: Type: text/html, Size: 1041 bytes --] ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Adding line to ld.so.conf 2011-11-21 16:17 ` Marc Ferland @ 2011-11-21 16:39 ` Mark Hatle 0 siblings, 0 replies; 6+ messages in thread From: Mark Hatle @ 2011-11-21 16:39 UTC (permalink / raw) To: yocto On 11/21/11 10:17 AM, Marc Ferland wrote: > On Mon, Nov 21, 2011 at 11:04 AM, Khem Raj <raj.khem@gmail.com > <mailto:raj.khem@gmail.com>> wrote: > > On Mon, Nov 21, 2011 at 7:35 AM, Marc Ferland <marc.ferland@gmail.com > <mailto:marc.ferland@gmail.com>> wrote: > > Hi, > > > > What's the proper way to add a line to the ld.so.conf file for a new library > > I am adding? > > > > if the libraries is in standard paths you dont have to add it but if > its in a special path > then just add the absolute path to the library e.g. /opt/lib if your > library is in /opt/lib > and then run ldconfig > > > What I meant was how to do it in a recipe file. I don't want to modify > ld.so.conf and run ldconfig each time I create a new image. There are issues with playing with ld.so.conf when doing a cross image generation. ldconfig doesn't always work during the rootfs process, most people don't notice since it's simply not necessary to be run in most cases! Lets assume for a minute that it does work in all cases.. (I'll explain a better solution in a bit.) You would want a post install script that: checks to see if the ld.so.conf already contains the line you need, if it does NOT, you would then add the line to the ld.so.conf file. Then you would run ldconfig within the post install script -- if you are not doing a cross install. (Cross installs automatically attempt to run ldconfig.) Something like... grep -q /opt/lib ${D}/etc/ld.so.conf || echo /opt/lib >> /etc/ld.so.conf if [ -z "${D}" ]; then ldconfig fi The above may work in your local projects, but will likely be rejected from submissions to the upstream project as being too fragile. ..... But there is a better way to do this and avoid using ldconfig. ldconfig was designed to be an optimization, but instead it's turned into a hack to cover up mistakes. It's primary use seems to be to cover up when people forget to create symlinks and/or don't specify an SONAME within a library. The secondary use is to add library information for libraries residing in non-standard locations... and the tertiary use is to simplify the lookup of the packages to avoid iterating over a filesystem. Instead of using ldconfig, inform the application on the locations of the non-standard items. This will then add them to the search path and ldconfig will no longer be necessary for a functional system, and instead become the optimization it was originally designed to be. One way to do this, when you are repackaging something you didn't create and only have the binaries for, is to create a wrapper script that sets "LD_LIBRARY_PATH=<path to library>" and then executes the action binary.. or If you are doing the compilation, use a built-in RPATH to specify where your application libraries exist. See: http://itee.uq.edu.au/~daniel/using_origin/ for a good explanation of what to pass to the linker and how to use "$ORIGIN" to make it easier -- and your application relocatable on the target. But in short you hard-code at compile time the location of your libraries based on the location of your executables. --Mark > Regards, > > Marc > > > _______________________________________________ > yocto mailing list > yocto@yoctoproject.org > https://lists.yoctoproject.org/listinfo/yocto ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Adding line to ld.so.conf 2011-11-21 15:35 Adding line to ld.so.conf Marc Ferland 2011-11-21 16:04 ` Khem Raj @ 2011-12-02 16:08 ` Michael E Brown 2011-12-02 16:27 ` Mark Hatle 1 sibling, 1 reply; 6+ messages in thread From: Michael E Brown @ 2011-12-02 16:08 UTC (permalink / raw) To: Marc Ferland; +Cc: yocto@yoctoproject.org On Mon, 2011-11-21 at 09:35 -0600, Marc Ferland wrote: > Hi, > > What's the proper way to add a line to the ld.so.conf file for a new > library I am adding? Does yocto support /etc/ld.so.conf.d/ (like every other distro out there from the past 7 years or so?) You could just drop a file into that directory with the lines you want rather than editing the global file. -- Michael ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Adding line to ld.so.conf 2011-12-02 16:08 ` Michael E Brown @ 2011-12-02 16:27 ` Mark Hatle 0 siblings, 0 replies; 6+ messages in thread From: Mark Hatle @ 2011-12-02 16:27 UTC (permalink / raw) To: yocto On 12/2/11 10:08 AM, Michael E Brown wrote: > On Mon, 2011-11-21 at 09:35 -0600, Marc Ferland wrote: >> Hi, >> >> What's the proper way to add a line to the ld.so.conf file for a new >> library I am adding? > > Does yocto support /etc/ld.so.conf.d/ (like every other distro out there > from the past 7 years or so?) > > You could just drop a file into that directory with the lines you want > rather than editing the global file. This is accomplished by having the following line in the /etc/ld.so.conf file. include ld.so.conf.d/*.conf However, this then still requires the file to exist on the target filesystem. I've got many systems where ld.so.conf simply doesn't exist, nor do I want it to. See my previous reply on a better was to resolve the issue using rpath and/or proper soname handling inside of the libraries. --Mark > -- > Michael > > _______________________________________________ > yocto mailing list > yocto@yoctoproject.org > https://lists.yoctoproject.org/listinfo/yocto ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-12-02 16:27 UTC | newest] Thread overview: 6+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2011-11-21 15:35 Adding line to ld.so.conf Marc Ferland 2011-11-21 16:04 ` Khem Raj 2011-11-21 16:17 ` Marc Ferland 2011-11-21 16:39 ` Mark Hatle 2011-12-02 16:08 ` Michael E Brown 2011-12-02 16:27 ` Mark Hatle
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