PM47987: Purify should have an option to search -L path and ignore LD_LIBRARY_PATH

Rational PurifyPlus for Linux and UNIX v7.0.1.0-004

APAR status

• Closed as program error.

Error description

• Environment:
  Red Hat Linux
  Purify 7.0.1 002
  gcc/g++
  
  Purify uses the LD_LIBRARY_PATH environment variable to locate
  libraries, by searching it first, apparently ignoring
  directories specified with the -L linker option. In most
  scenarios, this works fine, but in some others, it does not.
  
  Here is a scenario where it does not work:
  
  During the purify linking step, the behavior of finding a shared
  lib is expected to be the following:
    1- if the library is found from the -L path: use it....
    2- otherwise, if it can be found from the LD_LIBRARY_PATH: use
  it...
    3- otherwise, if it can be found in the ld.so.conf cache: then
  use it (on Linux)
    4- otherwise: fail
  
  However, there is a scenario where this does not work and upon
  further inspection, it appears this is what is happening:
  
    1- if the library is found from the -L path: read it but do
  not use it...
        1.1- if it can be found from the LD_LIBRARY_PATH:  then
  use it...
                even if another lib was first found in the -L
  search path
        1.2- otherwise, if it can be found in the ld.so.conf
  cache: then
                use it.. even if another lib was first found in
  the -L search path
        1.3 - otherwise fall back to using the one found in the -L
  path
     2- otherwise, if it can be found from the LD_LIBRARY_PATH:
  use it...
     3- otherwise, if it can be found in the ld.so.conf cache:
  then use it
     4- otherwise: fail
  
  Providing a new environment variable or a new option like
  '-link-using-link-searchpath' would be acceptable as it will
  ignore run-time search paths during link time. This would mean
  that Purify will ignore things like LD_LIBRARY_PATH as well as
  the LD cache.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Purify uses the LD_LIBRARY_PATH environment variable to
  located libraries during link time, so it picks up the
  library that will be used at runtime.  Customer wants the
  ability to have Purify pick up the library from the -L path
  instead.
  

Problem conclusion

• New option -use-link-time-search-path was added to cause
  Purify on Linux to instrument and link with the library that
  would be used at link time.
  

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

• Fixed component name

  PURIFY UNIX

• Fixed component ID

  5724G2102

Applicable component levels

• R701 PSN

     UP