http://sourceware.org/bugzilla/show_bug.cgi?id=15839
--- Comment #2 from asmtwiddler at gmail dot com ---
(In reply to Nick Clifton from comment #1)
> Created attachment 7160 [details]
> Update AVR linker script to only merge text and data sections during a final
> link
>
> Hi amstwiddler,
>
> Please could you try out the uploaded patch and let me know if it works
> for you.
>
> The problem is the AVR linker script which is merging the text sections
> created by -ffunction-sections into a single .text section, even when
> creating a relocatable object file.
>
> Cheers
> Nick
Thanks for the fast response.
I tried the patch and it's working correctly.
Now objdump -h shows that the sections have been relocated.
Also ld --gc-sections properly removes unused sections.
This works correctly with functions and data, but doesn't work with progmem
data.
I'm not sure whether or not this is intended (as progmem is a special section)
but the code below isn't relocated properly:
#include <avr/pgmspace.h>
const PROGMEM int table [] = {
8,7,6,5,4,3,2,1
};
Initial objdump:
Idx Name Size VMA LMA File off Algn
0 .text 00000000 00000000 00000000 00000034 2**0
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .data 00000000 00000000 00000000 00000034 2**0
CONTENTS, ALLOC, LOAD, DATA
2 .bss 00000000 00000000 00000000 00000034 2**0
ALLOC
3 .progmem.data.table 00000010 00000000 00000000 00000034 2**0
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 .comment 0000002a 00000000 00000000 00000044 2**0
CONTENTS, READONLY
Relocated objdump:
Idx Name Size VMA LMA File off Algn
0 .text 00000010 00000000 00000000 00000034 2**1
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .data 00000000 00000000 00000000 00000044 2**0
CONTENTS, ALLOC, LOAD, DATA
2 .bss 00000000 00000000 00000000 00000044 2**0
ALLOC
3 .comment 0000002a 00000000 00000000 00000044 2**0
CONTENTS, READONLY
I was able to fix this by changing
*(.progmem*)
to
${RELOCATING+ *(.progmem*)}
but I'm not sure if this is right.
Other than the "progmem" issue, I believe this is fixed.
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