GNU g++ / AIX ld question

[david at thekramers.net (David Kramer)]

I have a two-fold problem at work, where I am trying to move the company's
AIX 5.2 xlC-compiled C++ application to gcc (note that I just can't get
binutils to work right, so I'm using the native linker.  Anyone with 
experience using GNU toolchain under AIX wanna help with that one?).

1) The table of contents is > 64K, and according to their respective  
documentations, all options that either make the TOC bigger in ld, or put 
less in the TOC in gcc, make the program run slower.  This is not 
desirable, but not a show-stopper.

2) A library of ours (tccommon) that we are linking in has classes that 
reference another class (status) in another library (tcdb).  The 
application I am trying to link requires some classes from tccommon, but 
not any of the ones that require the status class.  However, the linker is 
complaining that the status class is missing (undefine symbols) anyway.  I 
thought they would have been garbage collected out.

The xlC compiler has an option, "-qfuncsect", which puts each function in 
a separate csect.  This seems equivalent to g++'s "-ffunction-sections".  
The kicker is that the older (for AIX 4.x) ld we used to use had an option 
"-qtwolink" to do a two-pass link to eliminate any sections containing 
only unreferenced objects.  That killed both birds with two stones.  

The newer ld doesn't seem to have an equivalent option.  My gut tells me 
there's nothing g++ can do about the problem, since g++ doesn't make any 
attempt to determine what objects get used or not, it just turns source 
code into objects.  Is there some AIX ld option I can specify that I'm 
missing to tell it to not include parts of tccommon that are not used?

Thanks.

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