wiki:compile_all_old

Version 6 (modified by Bayard Gildas, 3 years ago) (diff)

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Compile libraries, tools and demos

Compiling all is not really necessary, as everything necessary for development is already compilated in flair_bin repository. It is needed if you did not installed the toolchains in their defaults directories. It can also be used to compile all demos.

For developers on the Framework, it is a good way to check that everything is compiling.

To compile all Fl-AIR stuffs, you can execute the dedicated script:

$ $FLAIR_ROOT/flair-dev/scripts/flair_compile_all.sh

If it is the first time you execute this script, you must answer yes to the question Compile all from scratch. This will create every projects using cmake.

Compilation en mode debug

If you have to debug surprising segfaults (you know what I mean, do you? :D ) you will need to compile your code in debug mode (see below). Then you'll have to activate the core dump generation (in each terminal) with

$ ulimit -c unlimited

To be sure that the kernel will generate those migthy core file you should issue this command

echo core > /proc/sys/kernel/core_pattern (en sudo)

Then when your program crashes, it will generate a "core" file. Use gdb with your binary as the first parameter (again, compiled in debug mode) and the core file as the second parameter (use your cross compiled gdb in case of cross development, arm-poky...-gdb for instance to debug an arm code from your PC). It should load your program symbols. Then the "bt" command will show the backtrace, which is the sequence of function calls that resulted in the crash, allowing you to know exactly where is the problem.

Full framework

If you want to debug the framework itself, you may find beneficial to compile the full framework in debug mode you need to edit the file

$ /opt/robomap3/<version>/<arch>/toochain.cmake

and add "-g -O0" to the CMAKE_CXX_FLAGS variable. As of this writing, and for an x86 architecture, the file to edit is "/opt/robomap3/2.1.3/core2-64/toolchain.cmake". Then you shall rebuild the whole framework with a call to flair_compile_all.

Flair based app

If you want to debug your flair based application code, but don't need to debug the framework itself, you need to edit the file

<app>/build/CMakeFiles/<app>.dir/flags.cmake

and add the command add_definitions("-g -O0").