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Uncalled segment due to external variable?

T. Ma over 21 years ago

I know you have many discussions about warning L16 but I couldn't find one that would match with my problem below.

I got a warning L16: uncalled segment - SEGMENT: ?PR?API_module2?MODULE2 which my app had nothing to do with. See code below:

in test.c:  ---> app code built with lib1.lib
main {
 api_module1();
}

in module1.c: ----> part of lib1.lib
volatile char var1
api_module1( void ) {
   var1 = ...
}

in module2.c: ----> part of lib1.lib
extern volatile char var1
api_module2 ( void ) {
 if (var1 == ...)
}

I suspect the reason I got this warning was because of the global variable var1 (can't find any other link between these two modules except for this global variable).

Question:
If this variable is actually causing this problem, how do I get rid of it as it is increasing my app's code size unnecessary (by also include module2).
If this variable could not possible be causing this warning, where else should I look?

Also, in module2.c I have another API which does NOT use this var1 global variable but I also got the same warning. Any idea?

Parents

0 Jon Ward over 21 years ago in reply to Jon Ward

I created a simple project and linked it and I do not get the same problem you do.

Here is the linker MAP file.

BL51 BANKED LINKER/LOCATER V5.03


BL51 BANKED LINKER/LOCATER V5.03, INVOKED BY:
C:\KEIL\C51\BIN\BL51.EXE main.obj, .\libprj.LIB TO codeprj RAMSIZE (256)


MEMORY MODEL: SMALL


INPUT MODULES INCLUDED:
  main.obj (MAIN)
  .\libprj.LIB (FUNC1)
  C:\KEIL\C51\LIB\C51S.LIB (?C_STARTUP)


LINK MAP OF MODULE:  codeprj (MAIN)


            TYPE    BASE      LENGTH    RELOCATION   SEGMENT NAME
            -----------------------------------------------------

            * * * * * * *   D A T A   M E M O R Y   * * * * * * *
            REG     0000H     0008H     ABSOLUTE     "REG BANK 0"
            DATA    0008H     0001H     UNIT         ?DT?FUNC1
            IDATA   0009H     0001H     UNIT         ?STACK

            * * * * * * *   C O D E   M E M O R Y   * * * * * * *
            CODE    0000H     0003H     ABSOLUTE
            CODE    0003H     000CH     UNIT         ?C_C51STARTUP
            CODE    000FH     0005H     UNIT         ?PR?MAIN?MAIN
            CODE    0014H     0004H     UNIT         ?PR?FUNC1?FUNC1



OVERLAY MAP OF MODULE:   codeprj (MAIN)


SEGMENT
  +--> CALLED SEGMENT
---------------------
?C_C51STARTUP
  +--> ?PR?MAIN?MAIN

?PR?MAIN?MAIN
  +--> ?PR?FUNC1?FUNC1



SYMBOL TABLE OF MODULE:  codeprj (MAIN)

  VALUE           TYPE          NAME
  ----------------------------------

  -------         MODULE        MAIN
  C:0000H         SYMBOL        _ICE_DUMMY_
  C:000FH         PUBLIC        main
  -------         PROC          MAIN
  C:000FH         LINE#         3
  C:000FH         LINE#         4
  C:000FH         LINE#         5
  C:0012H         LINE#         7
  -------         ENDPROC       MAIN
  -------         ENDMOD        MAIN

  -------         MODULE        FUNC1
  C:0000H         SYMBOL        _ICE_DUMMY_
  D:0008H         PUBLIC        libvar
  C:0014H         PUBLIC        func1
  -------         PROC          FUNC1
  C:0014H         LINE#         3
  C:0014H         LINE#         4
  C:0014H         LINE#         5
  C:0017H         LINE#         6
  -------         ENDPROC       FUNC1
  -------         ENDMOD        FUNC1

Program Size: data=10.0 xdata=0 code=24
LINK/LOCATE RUN COMPLETE.  0 WARNING(S),  0 ERROR(S)

Jon

Reply

0 Jon Ward over 21 years ago in reply to Jon Ward

I created a simple project and linked it and I do not get the same problem you do.

Here is the linker MAP file.

BL51 BANKED LINKER/LOCATER V5.03


BL51 BANKED LINKER/LOCATER V5.03, INVOKED BY:
C:\KEIL\C51\BIN\BL51.EXE main.obj, .\libprj.LIB TO codeprj RAMSIZE (256)


MEMORY MODEL: SMALL


INPUT MODULES INCLUDED:
  main.obj (MAIN)
  .\libprj.LIB (FUNC1)
  C:\KEIL\C51\LIB\C51S.LIB (?C_STARTUP)


LINK MAP OF MODULE:  codeprj (MAIN)


            TYPE    BASE      LENGTH    RELOCATION   SEGMENT NAME
            -----------------------------------------------------

            * * * * * * *   D A T A   M E M O R Y   * * * * * * *
            REG     0000H     0008H     ABSOLUTE     "REG BANK 0"
            DATA    0008H     0001H     UNIT         ?DT?FUNC1
            IDATA   0009H     0001H     UNIT         ?STACK

            * * * * * * *   C O D E   M E M O R Y   * * * * * * *
            CODE    0000H     0003H     ABSOLUTE
            CODE    0003H     000CH     UNIT         ?C_C51STARTUP
            CODE    000FH     0005H     UNIT         ?PR?MAIN?MAIN
            CODE    0014H     0004H     UNIT         ?PR?FUNC1?FUNC1



OVERLAY MAP OF MODULE:   codeprj (MAIN)


SEGMENT
  +--> CALLED SEGMENT
---------------------
?C_C51STARTUP
  +--> ?PR?MAIN?MAIN

?PR?MAIN?MAIN
  +--> ?PR?FUNC1?FUNC1



SYMBOL TABLE OF MODULE:  codeprj (MAIN)

  VALUE           TYPE          NAME
  ----------------------------------

  -------         MODULE        MAIN
  C:0000H         SYMBOL        _ICE_DUMMY_
  C:000FH         PUBLIC        main
  -------         PROC          MAIN
  C:000FH         LINE#         3
  C:000FH         LINE#         4
  C:000FH         LINE#         5
  C:0012H         LINE#         7
  -------         ENDPROC       MAIN
  -------         ENDMOD        MAIN

  -------         MODULE        FUNC1
  C:0000H         SYMBOL        _ICE_DUMMY_
  D:0008H         PUBLIC        libvar
  C:0014H         PUBLIC        func1
  -------         PROC          FUNC1
  C:0014H         LINE#         3
  C:0014H         LINE#         4
  C:0014H         LINE#         5
  C:0017H         LINE#         6
  -------         ENDPROC       FUNC1
  -------         ENDMOD        FUNC1

Program Size: data=10.0 xdata=0 code=24
LINK/LOCATE RUN COMPLETE.  0 WARNING(S),  0 ERROR(S)

Jon

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