LI76801: IPA LINKING WITH WRONG LIBRARY

June 2012 Update for XL Fortran for Linux, V13.1
October 2012 Update for XL Fortran for Linux, V13.1
XL Fortran for Linux Fix Pack 8 (June 2013 Update) for 13.1

APAR status

• Closed as program error.

Error description

• When enabling IPA with the -O4 and above or -qipa compiler
  options and linking with a library using the -l option, the
  compiler is linking with libraries with the file suffix of *.so
  before libraries with the file suffix *.a when runtime linking
  is not enabled, that is, -brtl is not present.
  
  For example, when a directory contains two libraries with the
  same name, differing only by their file suffixes *.a and *.so,
  the compiler unexpectedly links with the *.so library when
  runtime linking is disabled.
  
  
  
  AIX library convention states that both static and shared
  objects can be contained within a *.a archive library.  Shared
  objects that have runtime linking enabled (compiled with -G) are
  not required to be put into an archive (if the user prefers),
  and instead the object file can be given the *.so file suffix.
  
  When linking with the '-l' option, the compiler by default
  searches only for *.a libraries.  If runtime linking is enabled
  (via the -brtl option) during the application link step, then
  the compiler will search for *.so libraries.  If none are
  found, it then searches for *.a libraries.
  
  
  
  The compiler's IPA step is not following the runtime linking
  name convention, and is trying to link with *.so libraries
  before *.a libraries.
  

Local fix

• - Rename one of the libraries
  - Move one of the libraries to a different directory
  - Do not use the '-l' option to link with the library, and
  instead, place the full library name on the compile line.  For
  example, to link with libmylib.so:
  
     $ xlc test1.c test2.c libmylib.so
  
  It should be noted that the library search path normally given
  by the '-L' option may not be present in the final executable,
  and the LIBPATH environment variable may need to be used.
  

Problem summary

• PROBLEM DESCRIPTION:
  The IPA link phase chooses the wrong library.
  
  USERS AFFECTED:
  Those using -O4 and above using two libraries with the same
  name and different file suffixes.
  

Problem conclusion

• The compiler now checks to see if there are both kinds of
  library with the same path name and different suffixes and uses
  the appropriate one based on the -brtl flat being on or off.
  

Temporary fix

Comments

APAR Information

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

  IV14250

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

Fix information

• Fixed component name

  XL FORTRAN LINU

• Fixed component ID

  5724X1600

Applicable component levels

• RD10 PSN IV14250

     UP06/09/13