link time optimization (-lto) of AVR breaks inclusion of debug info in elf file

[WestfW]

In recent versions of avr-gcc, the -g option is needed during compile in order to get enough debug information into the final elf file for things like a combined source/disassemebly (avr-objdump -SC foo.elf) to work. Now that link time optimization has been implemented, the "link" command will need the -g option as well as the individual compiles...

(It's possible that some other compile-time options also need to be moved to the link statement as well, but "-g" is the one I noticed.)

[facchinm]

Hi @WestfW ,
does it impact the size of the final hex (once the debug sections have been removed of course)? If it doesn't, I believe we could simply add the -g flag everywhere. Otherwise we'll need to provide a way to override the commandline in order to produce a debuggable elf

[matthijskooijman]

The .hex file is unaffected, so I would encourage adding -g.