RE: [avr-libc-dev] PROGMEM section variables throw awayby --gc-sections?

[Weddington, Eric]

-----Original Message-----
From: address@hidden on behalf of Dean
Sent: Wed 2007-11-14 3:59 AM
To: Rolf Ebert
Cc: address@hidden
Subject: Re: [avr-libc-dev] PROGMEM section variables throw awayby      
--gc-sections?
 
> --gc_sections removes all sections, that the linker thinks are unused. Did 
> you compile also with the -fdata-sections compiler switch?
>
> The assembler symbol of buildtime is not modified by -ffunction-sections, 
> only by -fdata-sections.
>
> I can also imagine a missing KEEP instruction in the linker script
>
> Rolf
>

Tested with -ffunction-sections and -fdata-sections, neither make any 
difference. Funny thing is, not all my PROGMEM data is being thrown away, 
only two unreferenced ones. I suppose the linker's technically justified in 
removing them, but is there a way to indicate that I want *all* PROGMEM 
variables preserved, no matter what? 

Come on, the linker is doing what you tell it to do. It's not psychic! Either 
don't use the -gc-sections switch, or use a custom linker script that uses the 
KEEP directive on the section. (See the ld manual for more information about 
this.)