Microsoft KB Archive/39371

From BetaArchive Wiki
Knowledge Base

Article ID: 39371

Article Last Modified on 10/16/2003


  • Microsoft Macro Assembler 5.0
  • Microsoft Macro Assembler 5.1 Standard Edition
  • Microsoft Macro Assembler 5.1a
  • Microsoft Macro Assembler 6.0 Standard Edition
  • Microsoft Macro Assembler 6.0a
  • Microsoft Macro Assembler 6.0b

This article was previously published under Q39371


A program which uses the .MODEL directive and has a procedure which receives arguments, will not assemble correctly if a language is not specified. Under Microsoft Macro Assembler (MASM) versions 5.0, 5.1, and 5.1a, the language is specified with the .MODEL directive and the following errors will be produced the language is omitted:

A2022: Operand must be type specifier
A2009: Symbol not defined: 'symbol'

Under MASM 6.0, 6.0a, and 6.0b, the language can be specified as part of the PROC syntax, with the .MODEL directive, with OPTION LANG, or with switches /Gc or /Gd. The following errors will be produced if the language is not specified

A2119: language type must be specified
A2006: undefined symbol: 'symbol'

The "Microsoft Macro Assembler Programmer's Guide" does not indicate that the language parameter is required in this case.


The language parameter on the .MODEL directive enables the PROC extensions, changes the scope of code labels within procedures, and may affect naming. When the language parameter is left off, the PROC directive will only accept a NEAR or FAR specifier.

The following sample program illustrates the situation:

Sample Code

;Assemble options needed: none

        .model small
;       .model small, c             ; This line will permit assembly.


myadd   PROC arg1:word, arg2:word

        LES bx, arg1
        LES dx, arg2

myadd   ENDP


Additional query words: kbinf 5.00 5.10 5.10a 6.00 6.00a 6.00b

Keywords: KB39371