From: Martin Str|mberg <ams AT speedy DOT ludd DOT luth DOT se>
Subject: Re: /DISCARD/ in linker script
Newsgroups: comp.os.msdos.djgpp
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Date: 06 Jul 2002 11:50:31 GMT
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Martin Str|mberg <ams AT speedy DOT ludd DOT luth DOT se> wrote:
: Martin Str|mberg <ams AT speedy DOT ludd DOT luth DOT se> wrote:
: : I want to make the .bss not to be included in output file. I use the
: : binary format ("ld --oformat binary").

: : Right now I have:
: : ENTRY(start)
: : SECTIONS
: : {
: : 	.text 0 : {
: : 		*(.text)
: : 		etext = . ; _etext = .;
: : 		. = ALIGN(0x100);
: : 	}
: : 	.data ALIGN(0x100) : {
: : 		*(.data)
: : 		edata = . ; _edata = .;
: : 		. = ALIGN(0x100);
: : 	}
: : 	/DISCARD/ SIZEOF(.data) + ADDR(.data) : {
: : 		*(.bss)
: : 		*(COMMON)
: : 		end = . ; _end = .;
: : 		. = ALIGN(0x100);
: : 	}
: : }

Further experiments gives that while

  /DISCARD/ : 
  {
    *(*)
  }

works

  /DISCARD/ : 
  {
    . = ALIGN(0x1000)
    *(*)
  }

does not.

: Uhum... It looks like the .bss isn't included in the output. It's
: automatically DISCARDed. Is this some sort of general knowledge or
: something. Because I read all of "info ld" and didn't learn this.

Sigh! Now with ld 2.11.2 it look like the .bss is included in the
image!

That makes me wonder if not all DJGPP binaries that is compiled with
ld 2.11.2 do include the .bss!


Right,

						MartinS