PI48787: USE OF VERTICAL BAR TO SPECIFY ORDER-ONLY PREREQUISITES CAUSES BUILD ERRORS IN CLEARMAKE'S GNU EMULATION

APAR status

• Closed as Permanent restriction.

Error description

• When attempting to perform a build using the IBM Rational
  ClearCase clearmake tool's GNU make emulation, the following
  error may occur if the makefile uses the "Vertical bar"/pipe
  character in the dependency list to specify an order-only
  dependency:
  clearmake: Warning: Cycle in dependency graph?
  clearmake: Warning: "|" was already seen.
  clearmake: Error:  Don't know how to make "before". Stop.
  
  Makefile used for the above error:
  OBJS=obj1 obj2
  
  all: $(OBJS)
  
  $(OBJS): | before
  
  obj%: src%
          @echo building obj $@
  
  src%:
          @echo building src $@
  
  before:
          @echo building $@
  
  Order-only dependencies are explicitly listed as supported in
  the makefile_gnu man page.
  Order-only dependencies are defined in
  https://www.gnu.org/software/make/manual/html_node/Prerequisite-
  Types.html
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users of ClearCase clearmake GNU emulation mode.             *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * ClearCase clearmake tool's GNU make emulation, may fail if   *
  * the makefile uses the "Vertical bar"/pipe character in the   *
  * dependency list to specify an order-only dependency.         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  

Problem conclusion

• Please avoid use of "Vertical bar"/pipe character in the
  dependency list to specify an order-only dependency.
  

Temporary fix

Comments

APAR Information

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

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

Fix information

Applicable component levels