Building SDKs
How to Build a Debug Enabled Erlang RunTime System
The erlang recipe from meta-erlang layer provides, via PACKAGECONFIG, a special way in order to build Erlang emulator for debugging purposes. The official Erlang/OTP has all the details about why a special build is necessary, Debug emulator.
Enable with:
PACKAGECONFIG:append:pn-erlang = " emu-type-debug"
Add the feature dbg-pkgs and tools-debug to EXTRA_IMAGE_FEATURES:
EXTRA_IMAGE_FEATURES:append = " dbg-pkgs tools-debug"
Build an image like core-image-minimal:
bitbake core-image-minimal
Run it using qemu:
runqemu core-image-minimal
Two shells:
One for running erl:
erl --emu-type debug
A second one for attaching gdb:
gdb --pid=19
According to Erlang/OTP documentation, the emu-type debug is a special emulator tailored for debugging purposes.