[Bug ld/15839] New: avr-ld -r removes sections created with avr-gcc -ffunction-sections -fdata-sections

[asmtwiddler at gmail dot com]

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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