On 3/25/21 11:07 PM, Huuki, Tuomas wrote:
Lähettäjä: Khem Raj <[email protected]>
Lähetetty: torstai 25. maaliskuuta 2021 20.29
Vastaanottaja: Huuki, Tuomas <[email protected]>;
[email protected]
Aihe: Re: [yocto] libcansocket: Weird issue with pkgsplit
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On 3/25/21 1:06 AM, Tuomas Huuki wrote:
Hello all,
I have an interesting situation with libcansocket and bitbake that I
cannot wrap my head around. For some reason, the packages are being
split up somewhat strangely and I cannot figure out why.
First of all, the recipe used is:
https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgith
ub.com%2Fopenembedded%2Fmeta-openembedded%2Fblob%2F9a0de2779b9b31f134f
fe19388b5b9b37bb6450e%2Fmeta-oe%2Frecipes-extended%2Fsocketcan%2Flibso
cketcan_0.0.11.bb&data=04%7C01%7Ctuomas.huuki%40crosscontrol.com%7
C8496799aa67e4cb3bac908d8efbbdd60%7C8b3fa9f59a3d4339a66aa9f7e39c9126%7
C0%7C0%7C637522937456377594%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMD
AiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=hLiu
fQtPTmCJvs1FfSemKVHnMmi5zBUKOHW%2BXgfMAyw%3D&reserved=0
<https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit
hub.com%2Fopenembedded%2Fmeta-openembedded%2Fblob%2F9a0de2779b9b31f134
ffe19388b5b9b37bb6450e%2Fmeta-oe%2Frecipes-extended%2Fsocketcan%2Flibs
ocketcan_0.0.11.bb&data=04%7C01%7Ctuomas.huuki%40crosscontrol.com%
7C8496799aa67e4cb3bac908d8efbbdd60%7C8b3fa9f59a3d4339a66aa9f7e39c9126%
7C0%7C0%7C637522937456387589%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwM
DAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=mp6
vRRNyAG%2Bf2KnsAxxIWWMgjrmp%2BZSJWgU2rCVxGP4%3D&reserved=0>
So no strange things there.
Additionally, looking at the built items:
../build/tmp/work/aarch64-poky-linux/libsocketcan/0.0.11-r0/image/usr/
lib$ ls -lah libsocketcan* lrwxrwxrwx 1 tuomas tuomas 21 maali 18
10:38 libsocketcan.so -> libsocketcan.so.2.3.0 lrwxrwxrwx 1 tuomas
tuomas 21 maali 18 10:38 libsocketcan.so.2 -> libsocketcan.so.2.3.0
-rwxr-xr-x 1 tuomas tuomas 58K maali 18 10:38 libsocketcan.so.2.3.0
All looks good at this point. Now, when I deploy the image, the first
link is missing.
When I look at pkgdata I can see that the link ends up in libsocketcan-dev:
$ oe-pkgdata-util list-pkg-files libsocketcan
libsocketcan:
/usr/lib/libsocketcan.so.2
/usr/lib/libsocketcan.so.2.3.0
$ oe-pkgdata-util list-pkg-files libsocketcan-dev
libsocketcan-dev:
/usr/include/can_netlink.h
/usr/include/libsocketcan.h
/usr/lib/libsocketcan.so
/usr/lib/pkgconfig/libsocketcan.pc
Its following usual soname naming conventions [1] for versioned shared libs
where .so is a symlink which is used when something is linking to it during
build time. thats why its in -dev package, if you want to use it at runtime
then linker will add proper versioned .so into DT_NEEDED sections of dependent
package which will be libsocketcan.so.2 in this case. So if your program is
trying to dlopen it then I would suggest to use libsocketcan.so.2 and if its
trying to link to it during build time then it should add right entry into
DT_NEEDED sections.
I am also wondering why would you want to move .so to main package.
Thank you for the input! The request actually came from a client (a special
case) and I started looking in to how to do this with Yocto/bitbake. It's still
a little unclear to me how the package is split in to the different subpackages
and how files end up in their locations. Any pointers on that?
look at populate_packages() function in package.bbclass
Also, the other confusing thing is the naming, where the main library is
renamed to libsocketcan2, but all the other packages are named libsocketcan.
-rw-r--r-- 3 tuomas tuomas 5,8K maali 25 10:19
libsocketcan2_0.0.11-r0.7_aarch64.ipk
-rw-r--r-- 3 tuomas tuomas 16K maali 25 10:19
libsocketcan-dbg_0.0.11-r0.7_aarch64.ipk
-rw-r--r-- 3 tuomas tuomas 3,1K maali 25 10:19
libsocketcan-dev_0.0.11-r0.7_aarch64.ipk
-rw-r--r-- 3 tuomas tuomas 13K maali 25 10:19
libsocketcan-doc_0.0.11-r0.7_aarch64.ipk
-rw-r--r-- 3 tuomas tuomas 8,9K maali 25 10:19
libsocketcan-src_0.0.11-r0.7_aarch64.ipk
But I guess that's just semantics.
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