LI74537: NO LOAD FOR VOLATILE INT AT -O2

May 2009 Updates for XL C/C++ Advanced Edition V8 for Linux

APAR status

• Closed as program error.

Error description

• The compiler does not mark a volatile int as volatile and
  there's no load instruction generated for the statement at -O2,
  causing the user program to hang at runtime.
  

Local fix

• use -g -O2 or use -O0.
  

Problem summary

• USER AFFECTED:
            Aggregates, which contain volatile members.
  
  PROBLEM DESCRIPTION:
            Aggregates, which contain volatile members are not
            correctly marked volatile leading to possible
            incorrect code generation resulting in
            unexpected run time behaviour of user application.
  

Problem conclusion

• The Compiler is modified to emit the correct volatile
            flags for such aggregates.
  

Temporary fix

Comments

APAR Information

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

  IZ35876

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

  LI74562 LI74599

Fix information

• Fixed component name

  XLC/C++ RHEL4

• Fixed component ID

  5724M1610

Applicable component levels

• R800 PSN IZ35876

     UP06/09/13