Welcome to my blog!

• Embedded C++ output size minimization

  2019-11-15

  Sl-Alex

  Embedded

  C++  MCU

  Embedded software developers normally prefer to use a pure C, however in some cases and especially in complex projects using C++ gives a more clear structured implementation. Unfortunately, by default C++ compiler produces pretty big binaries. This can be acceptable in case of a normal OS with a big amount of memory, but things are getting complicated when it comes to microcontrollers. I played a bit with compiler and linker options and it seems that the most size-consuming options CPP features are RTTI (run-time type information) and exceptions. I strongly believe that these are not things you can’t live without. So, I came up with the following configuration (valid for GCC toolchain):

  C++ compiler flags

  Flag	Description
  -fno-rtti	(Don’t generate run-time typed identification)
  -fno-exceptions	(Don’t catch exceptions)

  Linker flags:

  Flag	Description
  -flto	(Use link time optimization)
  -lstdc++	Use C++ libraries. You use them, right?

  Resulting binary size is pretty small and comparable with the equivalent C compiler output. Of course, you can reduce the size even more, but flags above are the most effective.

  Read All

  ---

• Show project name using "repo forall" alias

  2019-09-30

  Sl-Alex

  Linux

  repo

  Repo is a wonderful tool which simplifies my daily work across multiple Git repositories. One of the most useful commands in my opinion is repo forall. However, it does not show project name before performing a command on a specific repository. There is a -p parameter, which does exactly what I need, but some part of the output seems to be missing (at least in my case with 50+ repositories). After playing a bit around command-line parameters I came up with a simple solution. Just add the following to your bash alias list:

  repo_forall () { repo forall -c "echo -e \"\\e[32m\"\$REPO_PROJECT\"\\e[39m\"; $@" ;}
  

  After that just pass the command to this function:

  repo_forall "git branch"
  

  Here is a sample output:

  

  Read All

  ---

• Simple Deluge WebUI login

  2018-05-24

  Sl-Alex

  Web

  Deluge

  If you use Deluge WebUI then from time to time you have to enter your password and select default connection in the connection manager. It could be a bit annoying, especially if you use your own local server (e.g. OpenMediaVault) and do not expose WebUI to the external world. Of course, you can use a workaround and avoid direct interaction with WebUI. For example, Transdrone is a good Android interface, which can connect to Deluge using your WebUI password. Looks good, but it’s much better just to remove these annoying windows. In this post you’ll find a step-by-step instruction.

  Read All

  ---