snikulov

Bitbake Cheatsheet

Verbose as possible

bitbake -vDDD your-recipe

List recipes

bitbake -s

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Renew GPG key

Given that your key has expired.

$ gpg --list-keys
$ gpg --edit-key KEYID

Use the expire command to set a new expire date:

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Linux - Systemd cheatsheet

systemctl

Activates a service immediately:

systemctl start foo.service

Deactivates a service immediately:

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cmake_minimum_required(VERSION 3.10)
project(ProjectUsingConan)

#
# Don't forget to use libstdc++11 in profile by issuing
# $ conan profile update settings.compiler.libcxx=libstdc++11 default
#

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

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snikulov@snikulov-lin:~/work/check$ uname -a
Linux snikulov-lin 4.15.0-50-generic #54~16.04.1-Ubuntu SMP Wed May 8 15:55:19 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
snikulov@snikulov-lin:~$ cd work/
snikulov@snikulov-lin:~/work$ mkdir check
snikulov@snikulov-lin:~/work$ cd check
snikulov@snikulov-lin:~/work/check$ vim main.cpp
snikulov@snikulov-lin:~/work/check$ vim CMakeLists.txt
snikulov@snikulov-lin:~/work/check$ ls
CMakeLists.txt  main.cpp
snikulov@snikulov-lin:~/work/check$ scan-build cmake .

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CC=clang CXX=clang++ conan install .. \
  -s compiler=clang -s compiler.version=< 5.0| your version number here> \
  -s compiler.libcxx=<libstdc++ | libc++> --build=missing

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One-line Tree in Python

Using Python's built-in defaultdict we can easily define a tree data structure:

def tree(): return defaultdict(tree)

That's it!

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/* db_add.c: storing
   written by rock <shirock@residence.educities.edu.tw>, 1999.11.29
 */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <gdbm.h>

#define datum_set(um, buf) { um.dptr = buf; um.dsize = strlen(buf); }

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/* db_add.c: storing
   written by rock <shirock@residence.educities.edu.tw>, 1999.11.29
 */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <gdbm.h>

#define datum_set(um, buf) { um.dptr = buf; um.dsize = strlen(buf); }

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GCC Include search paths

For C:
gcc -xc -E -v -
For C++:
gcc -xc++ -E -v -

shorter variant:
gcc -Wp,-v -x c++ - -fsyntax-only