From: Gary D. Duzan <gdd0@gte.com>


Patches for OmniORB 2.4.0 under AIX 4.2
=======================================

   There is a problem with shared libraries under AIX in OmniORB 2.4.0.
The link step for the utilities in the tree look like:

xlC_r -o nameclt -L../../../../lib/powerpc_aix_4.2 nameclt.o ../../../../lib/powerpc_aix_4.2/libomniORB24.a -lomniORB24 -lomnithread2 -lpthreads

   However, in AIX when you link in a library in this fashion, and the
library is shared, the path is forced into the executable, and it will
only find the library if it is on that exact relative path, even if
LIBPATH is set:

gdd0@lion { ~/omniORB_2.4.0/bin/powerpc_aix_4.2 } % ( setenv LIBPATH ~/omniORB_2.4.0/lib/powerpc_aix_4.2 ; ./nameclt list )
Could not load program ./nameclt 
Could not load library ../../../../lib/powerpc_aix_4.2/libomniORB24.a[libomniORB2.so.4.1]
Error was: No such file or directory
gdd0@lion { ~/omniORB_2.4.0/bin/powerpc_aix_4.2 } % 

   If you instead link like this:

xlC_r -o nameclt -L../../../../lib/powerpc_aix_4.2 nameclt.o -lomniORB24 -lomnithread2 -lpthreads

   simply removing the *.a file from the command, it works fine:

root@lion { ~/omniORB_2.4.0/src/appl/utils/nameclt } # xlC_r -o nameclt -L../../../../lib/powerpc_aix_4.2 nameclt.o -lomniORB24 -lomnithread2 -lpthreads
root@lion { ~/omniORB_2.4.0/src/appl/utils/nameclt } # cd ..
root@lion { ~/omniORB_2.4.0/src/appl/utils } # nameclt/nameclt list
Could not load program nameclt/nameclt 
Could not load library libomniORB24.a[libomniORB2.so.4.1]
Error was: No such file or directory
root@lion { ~/omniORB_2.4.0/src/appl/utils } # (setenv LIBPATH ~/omniORB_2.4.0/lib/powerpc_aix_4.2 ; nameclt/nameclt list)
Configuration error: Invalid object reference supplied for NAMESERVICE.
IOT trap (core dumped)
root@lion { ~/omniORB_2.4.0/src/appl/utils } # 

You may note that the directory changes and that the second one is run as root,
but I ran the first as root from the same directory as the second and got the 
same thing.
   After a bit of investigation, it appears that the problem is due to
the use of $(LibSharedSuffixPattern) in AIX. $(LibSuffixPattern), which
is set to %-ar.a, is filtered out, but $(LibSharedSuffixPattern), which
is set to %.a, is not. If I add the following to
mk/platforms/powerpc_aix_4.2.mk it seems to do the right thing:

define CXXExecutable
(set -x; \
 $(RM) $@; \
 $(CXXLINK) -o $@ $(CXXLINKOPTIONS) $(IMPORT_LIBRARY_FLAGS) \
    $(filter-out $(LibSharedSuffixPattern), $(filter-out $(LibSuffixPattern),$^)) $$libs; \
)
endef
 
define CExecutable
(set -x; \
 $(RM) $@; \
 $(CLINK) -o $@ $(CLINKOPTIONS) $(IMPORT_LIBRARY_FLAGS) \
    $(filter-out $(LibSharedSuffixPattern), $(filter-out $(LibSuffixPattern),$^)) $$libs; \
)
endef