I have two related/unrelated problems compiling and building Shared Library
files (.so).

AIX 5.2
IBM(R) VisualAge(R) C++ Version 6.0.0.11

When building .so files, I get the following link error (the error doesn't
occur when building a static library .a):

ld: 0711-781 ERROR: TOC overflow. TOC size: 67904 Maximum size: 65536
make: 1254-004 The error code from the last command is 12.

I can bypass this with the -bbigtoc flag; however, this increases the file
size and may be a performance hit?

Also, I get tons of Duplicate symbol warnings such as this one:

ld: 0711-224 WARNING: Duplicate symbol:
..std::basic_string<char,std::char_traits<char>,st d::allocator<char>
>::basic_string(const char*)

These duplicate symbol warnings appear whether building a library or an
executable... the TOC error only occurs when building the .so file. I don't
know if they are related -- the TOC error is a serious problem, while
currently, the duplicate symbols is a major annoyance (that I feel should
not be present). Does anyone have suggestions or insights into how to fix
the problems or what would cause the problems? Below are stripped down
commands I am using to compile and build the libraries (there are actually
lots of .o files). Using xlC_r rather than just xlC because other libraries
that I am linking with make use of threading.

// Compiling Source Files
xlC_r -q64 -c MyFile1.cpp -o MyFile1.o
xlC_r -q64 -c MyFile2.cpp -o MyFile2.o

// Creating Static Library...
ar -ru -X64 -o libMyLibrary.a MyFile1.o MyFile2.o

// Creating Shared Library...
xlC_r -G -qmkshrobj -q64 -o libMyLibrary.so MyFile1.o MyFile2.o

// Eliminates the error building the shared library
xlC_r -G -qmkshrobj -q64 -bbigtoc -o libMyLibrary.so MyFile1.o MyFile2.o

Hopefully someone can help me get to the root of this problem!
Thanks,
Kyle

Kyle Kolander wrote:
> When building .so files, I get the following link error (the error doesn't
> occur when building a static library .a):
>
> ld: 0711-781 ERROR: TOC overflow. TOC size: 67904 Maximum size: 65536
> make: 1254-004 The error code from the last command is 12.
>
> I can bypass this with the -bbigtoc flag; however, this increases the file
> size and may be a performance hit?

Yes, although slight. Your only other choice is to split the code
into two modules.

> Also, I get tons of Duplicate symbol warnings such as this one:
>
> ld: 0711-224 WARNING: Duplicate symbol:
> .std::basic_string<char,std::char_traits<char>,std ::allocator<char>
>
>>::basic_string(const char*)

That's what happens with C++. AIX 5.3 introduces a new feature
for weak symbols, but in the meantime your only options are to
(A) ignore them, or (B) use -bh:5 to suppress them. Note that
this may also suppress warnings which you want to know about.

--
Gary R. Hook
__________________________________________________ ______________________
Vocatus atque non vocatus deus aderit

"Gary R. Hook" <noway@nospammers.net> wrote in message
news:JFoje.2096$5Z1.1788@newssvr30.news.prodigy.co m...
> Kyle Kolander wrote:
> > When building .so files, I get the following link error (the error
doesn't
> > occur when building a static library .a):
> >
> > ld: 0711-781 ERROR: TOC overflow. TOC size: 67904 Maximum size:
65536
> > make: 1254-004 The error code from the last command is 12.
> >
> > I can bypass this with the -bbigtoc flag; however, this increases the
file
> > size and may be a performance hit?
>
> Yes, although slight. Your only other choice is to split the code
> into two modules.
>

As it turns out, there was an existing header file with a lot of string
declarations like:

const std::string SOME_STRING = "Some_String";

that was being included in many source files. I modified this design to
extern the
declarations in the header file and added a source file with the
definitions:

// in .h
extern const std::string SOME_STRING;
// in .cpp
const std::string SOME_STRING = "Some_String";

This has taken care of the TOC error and drastically reduced the size of our
library.
Figured I would post the solution in case someone else encounters a similar
problem...

> > Also, I get tons of Duplicate symbol warnings such as this one:
> >
> > ld: 0711-224 WARNING: Duplicate symbol:
> > .std::basic_string<char,std::char_traits<char>,std ::allocator<char>
> >
> >>::basic_string(const char*)
>
> That's what happens with C++. AIX 5.3 introduces a new feature
> for weak symbols, but in the meantime your only options are to
> (A) ignore them, or (B) use -bh:5 to suppress them. Note that
> this may also suppress warnings which you want to know about.
>

Maybe I am just blind, but did not notice anywhere in documentation about
level 5 suppressing duplicate symbols. A co-worker came across a website
that explained this option, too. man ld lists the -bh:number option, but
did not
show a level 5 option or what it specifies. If you don't mind, could you
let
me know where you found this option?

Thanks for help!
Kyle

> --
> Gary R. Hook
> __________________________________________________ ______________________
> Vocatus atque non vocatus deus aderit

Kyle Kolander wrote:
> Maybe I am just blind, but did not notice anywhere in documentation about
> level 5 suppressing duplicate symbols. A co-worker came across a website
> that explained this option, too. man ld lists the -bh:number option, but
> did not
> show a level 5 option or what it specifies. If you don't mind, could you
> let
> me know where you found this option?

You're not blind.

It's probably not actually written out anywhere. I know from
looking at the code, and from my development experience
on the AIX kernel.

--
Gary R. Hook
__________________________________________________ ______________________
Vocatus atque non vocatus deus aderit