Order Segments (/DO)

Syntax: /DO[SSEG]

This option is automatically enabled by a special object module record in many language libraries. If you are linking to one of these libraries, you need not specify this option.

The /DO option is also enabled by assembly modules that use the Macro Assembler directive .DOSSEG.

This option forces segments to be ordered as follows (first to last):

• All code segments

• Far data segments

• Near data (DGROUP) segments, in the following order:

  a.

  Any segments of class BEGDATA (this class name is reserved)
  b.
  Any segments not of class BEGDATA, BSS, or STACK
  c.
  Segments of class BSS
  d.
  Segments of class STACK

  In addition, the /DO option causes LINK386 to do the following:

  • Initialize two special variables:

    _edata = DGROUP : BSS_end = DGROUP : STACK
    

    The variables _edata and _end have special meanings for certain compilers; avoid using these names in your programs. Assembly-language programs can refer to these variables, but should not change them.

  • Insert 16 null bytes at the beginning of the _TEXT segment (if this segment is defined).

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