Couring GIT output

Default git colour setup is not so good. On black terminal background it looks dark:

297

However, with small change in ~/.git/config file:

[color "diff"]
meta = yellow bold
frag = magenta bold
old = red bold
new = green bold

you would get much better diff display on your terminal:

298

Posted in en | Tagged | Comments Off on Couring GIT output

[FIXED] "not found (try using -rpath or -rpath-link)" during cross compilation

linuxWhen you see the following kind of errors during cross compilation (linking phase):

ld: warning: libfontconfig.so.1, needed by …/libQtGui.so, not found (try using -rpath or -rpath-link)
ld: warning: libaudio.so.2, needed by …/libQtGui.so, not found (try using -rpath or -rpath-link)

There could be two reasons:

  • the list of required binaries is not complete and linker cannot complete the linking automatically
  • your $SYSROOT/usr/lib is not passed to linker by -rpath-link as mentioned in error message

During normal native build your libraries are stored in standard locations (/usr/lib) and locating libraries is easier. Cross compilation needs more attention in this ares as SYSROOT is not standard.

Then search for LDFLAGS setup in your build scripts:

LDFLAGS="-L${STAGING_LIBDIR}"

And change to the following:

LDFLAGS="-Wl,-rpath-link,${STAGING_LIBDIR}-L${STAGING_LIBDIR}"

The clumsy syntax -Wl,<options-with-comma-as-space> tells your compiler (that is used for linking purposes) to pass the options (with commas replaced by spaces of course) to linker (ld).

Posted in en | Tagged | Comments Off on [FIXED] "not found (try using -rpath or -rpath-link)" during cross compilation

Buildroot basics

linuxIf you are an embedded software developer like me chances are you use embedded Linux for the purpose. It's Open Source, has great tools support and is a great software environment where (almost) everything could be automated through command line interfaces.

Once you decide about operating system used the next step is to choose a build system that would be used for the task of building the software. There are few choices you can select from:

  • use pre-built toolchain and rootfs and add your binaries and configuration files (i.e. STLinux for ST-based devices)
  • use OpenEmbedded for full-featured buildsystem with packaging system included
  • use BuildRoot for simple build system without packaging system included

Today I'm going to tell you about the 3rd option. Buildroot states their view on packaging systems for embedded development this way:

We believe that for most embedded Linux systems, binary packages are not necessary, and potentially harmful. When binary packages are used, it means that the system can be partially upgraded, which creates an enormous number of possible combinations of package versions that should be tested before doing the upgrade on the embedded device. On the other hand, by doing complete system upgrades by upgrading the entire root filesystem image at once, the image deployed to the embedded system is guaranteed to really be the one that has been tested and validated.

After few years with OpenEmbedded and few months with Buildroot I like the simplicity of Buildroot model. Below you can find basic (the most important in my opinion) concepts of Buildroot.

Continue reading

Posted in en | Tagged , , | Comments Off on Buildroot basics

[SOLVED] VPN connectioin error: short read (-1): Message too long

If you encounter the following error during VPN connection:

pptp[12549]: nm-pptp-service-12543 warn[decaps_gre:pptp_gre.c:331]: short read (-1): Message too long

there's an easy fix. You have to lower your MTU (automatically obtained value was invalid).

First, you have to locate your VPN gateway address in syslog:

NetworkManager[11926]: <info> VPN Gateway: X.X.X.X

Then, you have to check minimum MTU toward this address:

$ traceroute –mtu X.X.X.X
traceroute to X.X.X.X (X.X.X.X), 30 hops max, 65000 byte packets
1  192.168.43.1 (192.168.43.1)  4.309 ms F=1380  4.042 ms  2.535 ms
2  * *^C

Then you have to change MTU it in your primary connection settings (network manager on Ubuntu below):

504

That's all!. No more spurious disconnects!

Posted in en | Tagged | Comments Off on [SOLVED] VPN connectioin error: short read (-1): Message too long

PayU apologizes for …

The best idea PR guys from PayU might have:

Dear Sir or Madam,

We would like to apologize for the INCORRECT INFORMATION in our last communication.

During the break which will take place on 27 November 2014 from 05:00 am to 05:30 am you could not be able to log in into the system but all transactions WILL BE SETTLED. A message informing about unavailability of the service may be displayed during login attempt.

We are very sorry for the inconvenience and misrepresentation.

Kind regards,
PayU Team

The funny thing is that I haven't got any e-mail on the technical break in the first place.

LOL.

Posted in en | Tagged | Comments Off on PayU apologizes for …