What meaning this Link error message ?

[vega]

Now, I doing study about make & using Dynamic Link Library.
This is my Trainning Code that refered Icezelion DLL Tutors.



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Comment^........................................................
  File: MycroDll.asm
  Note: Source Code of MycroDll.DLL
  Date: AH. 63.09.03
^.....................................................................

.386
.MODEL  FLAT, STDCALL
OPTION  CASEMAP:NONE

INCLUDE  \MASM32\Include\Windows.inc

;; this line causes Link warning error ..!!
INCLUDE  \MASM32\Mymacro\Mymacros.inc

INCLUDE  \MASM32\Include\user32.inc
INCLUDE  \MASM32\Include\kernel32.inc
INCLUDELIB  \MASM32\Lib\user32.lib
INCLUDELIB  \MASM32\Lib\kernel32.lib


.DATA
    ;

.CODE

DllEntry  PROC  hInstDLL:HINSTANCE, reason:DWORD, reserved1:DWORD
   MOV  EAX, TRUE
   RET
DllEntry  ENDP


Who_are_you?  PROC
   ;; these are macro sentences of Mymacros.inc
   Display_string  literal("I am Mac.")
   Return
Who_are_you?  ENDP


END  DllEntry



############################################################




........................................................
  File: MycroDll.def
  Note: Procedure definitions of MycroDll.DLL
  Date: AH. 63.09.03
........................................................


LIBRARY   MycroDll
EXPORTS   Who_are_you?





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........................................................
  File: MycroDll.bat
  Note: Auto make batch for MycroDll.DLL
  Date: AH. 63.09.03
........................................................


   @echo off
   
   if exist MycroDll.OBJ del MycroDll.OBJ
   if exist MycroDll.DLL del MycroDll.DLL
   
   \MASM32\bin\ML /c /coff MycroDll.ASM
   
   \MASM32\bin\LINK /DLL /SUBSYSTEM:WINDOWS /DEF:MycroDll.DEF MycroDll.OBJ
   
   Dir MycroDll.*
   
   pause



############################################################



Assemble & Link process is normally OK when removed this line in MycroDll.asm.

   INCLUDE  \MASM32\Mymacro\Mymacros.inc

If insert this line, it occures Link error as following 'Warning' Message.

   Creating library MycroDll.lib and object MycroDll.exp
   LINK : warning LNK4089: all reference to "user32.dll" discarded by /OPT:REF



Please teach me, why & what meaning it ?

[japheth]

It's a nice hint from the linker that you can probably remove the "includelib ...\user32.lib" line in your source without damage, thus saving some bytes on your storage medium. Besides that, you won't gain or loose much.

[vega]

if remove the "includelib ...\user32.lib" line, it causes this problem.

   Creating library MycroDll.lib and object MycroDll.exp
   MycroDll.obj : error LNK2001 : unresolved external symbol _wsprintfA
   MycroDll.dll  : fatal error LNK1120: 1 unresolved externals

[vega]

Thank you, Japheth
I solved my problem by using small subset of Mymacros.inc.
Perhaps it has problems in Mymacros.inc.
But i don't understand any macro causes problems, yet.