IBM Support

PI18974: INCORRECT JUMP LABEL WITH OPTIMIZATION

A fix is available

Obtain the fix for this APAR.

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • When compiling a Metal C application with optmization enabled, a
goto jump label ADCON symbol name is generated incorrectly,
leading to an 'undefined symbol' error when assembling.  For
example:


==== Metal C code ====
my_goto_label:       // goto jump label
...
goto my_goto_label;  // jump to label


==== Assembly code ====
     BRE   my_goto_label@1671
     MVC   8(4,13),#NAB_23
     BRASL 14,@@CCN@1031
my_goto_label@1671 DS 0H


==== Assembly ADCON section ====
DC    A(my_goto_label@23-@@LIT@23)


==== Error during assemble ====
99393          DC   A(my_goto_label@23-@@LIT@23)
ASMA044E Undefined symbol - my_goto_label@23

Local fix

  • Do not use optimization.

Problem summary

  • ****************************************************************
* USERS AFFECTED: z/OS V2R1 users using METAL OPT with         *
*                 switch statements and user labels.           *
****************************************************************
* PROBLEM DESCRIPTION: Metal C jump table entry has undefined  *
*                      labels.                                 *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************

Problem conclusion

  • Apply provided service.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    PI18974
    • 

  • Reported component name
    C/C++ FOR MVS
    • 

  • Reported component ID
    56551210A
    • 

  • Reported release
    790
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2014-05-30
    • 

  • Closed date
    2014-06-04
    • 

  • Last modified date
    2016-09-13
    • 





    

  • APAR is sysrouted FROM one or more of the following:
    

    • 

  • APAR is sysrouted TO one or more of the following:
    

    • 



Modules/Macros


    

  • CCNETBY

    



Fix information


    

  • Fixed component name
    C/C++ FOR MVS
    • 

  • Fixed component ID
    56551210A
    • 



Applicable component levels


    

  • R790  PSY  UI18560
       UP14/07/17  P  F407
    • 



Fix is available


    

  • Select the PTF appropriate for your component level.
You will be required to sign in. Distribution on physical
media is not available in all countries.
    








      
              
                            

              

              [{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG19M","label":"APARs - z\/OS environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"790","Edition":"","Line of Business":{"code":"","label":""}},{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSQKCWV","label":"IBM C\/C++ for MVS\/ESA"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"790","Edition":"","Line of Business":{"code":"LOB35","label":"Mainframe SW"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            15 August 2024
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
Page Feedback