Hi Sebastian
2014-03-25 21:21 GMT+01:00 Sebastian Schildt schildt@ibr.cs.tu-bs.de:
Hello,
You did not specify exactly how you cross-compiled, but I guess your build is broken. Unfortunately there is much more to cross-compiling than just choosig the right architecture.
libm.so normally contains basic math functions, which defintely are available on your plattform "somehow", however maybe they are in your uclibc (or glibc which are you using?) and not seperately or you might need to statically link them. At least it sounds like maybe you accidentally linked with a host library instead of the target, or your cross-compiling environment did not match the target.
I have checked out that the library is there and I have found it
$VirtualBox:~/openwrt/attitude_adjustment_rPi$ locate ./ libm.so /attitude_adjustment_rPi/build_dir/target-arm_v6_eglibc-2.15_eabi/root-brcm2708/lib/libm.so.6 /attitude_adjustment_rPi/build_dir/target-arm_v6_eglibc-2.15_eabi/toolchain/ipkg-brcm2708/libc/lib/libm.so.6 /attitude_adjustment_rPi/build_dir/toolchain-arm_v6_gcc-4.6-linaro_eglibc-2.15_eabi/eglibc-2.15-r18909-final/math/libm.so /attitude_adjustment_rPi/build_dir/toolchain-arm_v6_gcc-4.6-linaro_eglibc-2.15_eabi/eglibc-2.15-r18909-final/math/libm.so.6 /attitude_adjustment_rPi/staging_dir/target-arm_v6_eglibc-2.15_eabi/root-brcm2708/lib/libm.so.6 /attitude_adjustment_rPi/staging_dir/toolchain-arm_v6_gcc-4.6-linaro_eglibc-2.15_eabi/lib/libm.so /attitude_adjustment_rPi/staging_dir/toolchain-arm_v6_gcc-4.6-linaro_eglibc-2.15_eabi/lib/libm.so.6
and on my openwrt the library is present as well root@OpenWrt:/lib# ls -la | grep libm -rwxr-xr-x 1 root root 615996 Mar 22 2014 libm-2.15.so lrwxrwxrwx 1 root root 12 Mar 22 2014 libm.so.6 -> libm-2.15.so
So then is it a matter of crosscompilation?
Thanks in advance,
Regards
There are buildroot (which is used by OpenWRT) recipes for all IBR-DTN components, which you can find here
https://github.com/ibrdtn/ibrdtn/tree/master/recipes/buildroot
If your build has not been created with buildroot you should try to make this work first. If it is, maybe describe what you needed to change to make it compile.
Just using "any" toolchain that targets the processor (e.g. using a toolchain for A PI with Raspbian, because I think the processor is related) will most likely not work, unless you configure it to build a huge statically linked binary.
Sebastian
On 25 Mar 2014, at 19:59, Francisco Cuesta ndarkness@gmail.com wrote:
Hello Juliano,
Thanks for replying, the point is that I don't know what library I have
to install in order to get libm.so.0 on openwrt. I mean, I think maybe my OpenWRT OS is lacking that library and I don't know which package I should install to get it.
Thanks again,
Regards
2014-03-24 18:25 GMT+01:00 Juliano julianofischer@gmail.com: Hi Francisco, you shall add the dir wich contains libm.so.0 to the library path. ( /mnt/usb/opkg/lib in my case)
Juliano Fischer Naves Informatics Professor - IFRO D.Sc. Student - IC/UFF/Brazil
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Document Freedom Day - Liberate your documents http://documentfreedom.org/ - March 26th 2014
2014-03-24 12:13 GMT-04:00 Francisco Cuesta ndarkness@gmail.com: Hello IBR staff,
I was wondering whether you have available a version of ibr dtn openwrt
packages for broadcom 2708 chipset, it is based on arm architecture, quite similar to raspberri pi.
I have seen here
http://trac.ibr.cs.tu-bs.de/project-cm-2012-ibrdtn/wiki/download#OpenWRTrepo... that you mention the possibility to find different architectures in your jetkins builder, however, I could find any reference to broadcom architecture there.
Therefore, I tried to crosscompilie ibr dtn from source aiming to that
architecture and with openwrt as OS. I got the daemon, libraries and binaries, but now I get the following error when trying to start the daemon itself.
root@OpenWrt:~# dtnd dtnd: error while loading shared libraries: libm.so.0: cannot open
shared object file: No such file or directory
Did I miss to include some library when crosscompiling? Or I am missing
it on my openwrt OS? In such a case, what libraries should I install?
Thanks in advance,
Regards!
Below all the packages I installed listed with opgk list
root@OpenWrt:/lib# opkg list base-files - 118.2-r39952 blkid - 2.21.2-1 block-mount - 0.2.0-9 busybox - 1.19.4-6 dnsmasq - 2.66-2 dropbear - 2011.54-2 e2fsprogs - 1.42.4-1 gdb - 6.8a-4 hotplug2 - 1.0-beta-4 hwclock - 2.21.2-1 iw - 3.6-1 jshn - 2013-10-19-734d28eb1a46358743cf8837c91e5d46695c3b91 kernel - 3.3.8-1-85fa4859c0083294a4ca10e855c97bf6 kmod-ath - 3.3.8+2014-01-23.1-1 kmod-ath9k-common - 3.3.8+2014-01-23.1-1 kmod-ath9k-htc - 3.3.8+2014-01-23.1-1 kmod-cfg80211 - 3.3.8+2014-01-23.1-1 kmod-crypto-aes - 3.3.8-1 kmod-crypto-arc4 - 3.3.8-1 kmod-crypto-core - 3.3.8-1 kmod-fs-vfat - 3.3.8-1 kmod-hid - 3.3.8-1 kmod-input-core - 3.3.8-1 kmod-input-evdev - 3.3.8-1 kmod-ipt-conntrack - 3.3.8-1 kmod-ipt-core - 3.3.8-1 kmod-ipt-nat - 3.3.8-1 kmod-ipt-nathelper - 3.3.8-1 kmod-lib-crc-ccitt - 3.3.8-1 kmod-mac80211 - 3.3.8+2014-01-23.1-1 kmod-nls-base - 3.3.8-1 kmod-nls-cp437 - 3.3.8-1 kmod-nls-iso8859-1 - 3.3.8-1 kmod-sound-arm-bcm2835 - 3.3.8-1 kmod-sound-core - 3.3.8-1 kmod-usb-core - 3.3.8-1 kmod-usb-hid - 3.3.8-1 libblkid - 2.21.2-1 libblobmsg-json - 2013-10-19-734d28eb1a46358743cf8837c91e5d46695c3b91 libbsd - 0.3.0-1 libc - 2.15-1 libcom_err - 1.42.4-1 libcurl - 7.29.0-1 libdaemon - 0.14-2 libext2fs - 1.42.4-1 libgcc - 4.6-linaro-1 libip4tc - 1.4.10-5 libjson - 0.11-2 libjson-c - 0.11-2 liblua - 5.1.4-8 libmount - 2.21.2-1 libncurses - 5.7-5 libncursesw - 5.7-5 libnl - 2.0-1 libnl-tiny - 0.1-3 libopenssl - 1.0.1e-1 libpthread - 2.15-1 libpthread - 0.9.33.2-1 libreadline - 5.2-2 librpc - 0.9.32-rc2-0a2179bbc0844928f2a0ec01dba93d9b5d6d41a7 librt - 2.15-1 librt - 0.9.33.2-1 libsqlite3 - 3071201-1 libstdcpp - 4.6-linaro-1 libubox - 2013-10-19-734d28eb1a46358743cf8837c91e5d46695c3b91 libubus - 2013-08-08-b20a8a01c7faea5bcc9d34d10dcf7736589021b8 libubus-lua - 2013-08-08-b20a8a01c7faea5bcc9d34d10dcf7736589021b8 libuci - 2013-06-11.1-1 libuci-lua - 2013-06-11.1-1 libuuid - 2.21.2-1 libxtables - 1.4.10-5 lua - 5.1.4-8 luac - 5.1.4-8 mount-utils - 2.21.2-1 netifd - 2013-07-16-2674941b06c1ec67f1aff1bff9212e1372106641 opkg - 9c97d5ecd795709c8584e972bfdf3aee3a5b846d-3 swap-utils - 2.21.2-1 terminfo - 5.7-5 ubus - 2013-08-08-b20a8a01c7faea5bcc9d34d10dcf7736589021b8 ubusd - 2013-08-08-b20a8a01c7faea5bcc9d34d10dcf7736589021b8 uci - 2013-06-11.1-1 zlib - 1.2.7-1
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