http://sourceware.org/bugzilla/show_bug.cgi?id=15839
Bug ID: 15839
Summary: avr-ld -r removes sections created with avr-gcc
-ffunction-sections -fdata-sections
Product: binutils
Version: 2.23
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: asmtwiddler at gmail dot com
Currently avr-ld -r merges sections created with avr-gcc -ffunction-sections
-fdata-sections back into the .text and .data sections.
This is problematic as it prevents --gc-sections from removing unused
functions.
Example:
long func1(long val) {
return val - 1;
}
long func2(long val) {
return val + 1;
}
I compiled with avr-gcc -ffunction-sections -fdata-sections -c
I also used -O2 -mmcu=atmega328 -Wall but that shouldn't matter.
Then I ran avr-ld -r on the created object file to create a new object file.
Using avr-objdump -h gave me, for the initial object file:
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 .text.func1 0000000a 00000000 00000000 00000034 2**0
CONTENTS, ALLOC, LOAD, READONLY, CODE
4 .text.func2 0000000a 00000000 00000000 0000003e 2**0
CONTENTS, ALLOC, LOAD, READONLY, CODE
5 .comment 0000002a 00000000 00000000 00000048 2**0
CONTENTS, READONLY
And for the second (relocated) object file:
Idx Name Size VMA LMA File off Algn
0 .text 00000014 00000000 00000000 00000034 2**1
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .data 00000000 00000000 00000000 00000048 2**0
CONTENTS, ALLOC, LOAD, DATA
2 .bss 00000000 00000000 00000000 00000048 2**0
ALLOC
3 .comment 0000002a 00000000 00000000 00000048 2**0
CONTENTS, READONLY
Thanks for any help.
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