Unix Programming - Creating a static library with other libraries

Author

Creating a static library with other libraries

jose_luis_fdez_diaz

2007-02-21, 7:10 pm

Hi,

Given these static libraries:

- libstatic1.a
- libstatic2.a

I link they with a the "main" file: main.c

aCC -lstatic1 -lstatic2 main.c

In libstatic1.a objects files I use classes declared in libstatic2.a.
When I link I get this error:

/usr/ccs/bin/ld: (Warning) The CTTI instantiation with key symbol
"LBXRecord::~LBXRecord()" in file main.o has been overridden by an
explicit definition in file lib/libstatic2.a. This behavior may not be
supported in future releases.

To fix this issue I appended libstatic2.a to libstatic1.a when I
created it:

ar libstatic1.a libstatic1.a *.o

and link with:

aCC -lstatic1 main.c

But I have global vars defined in some libstatic2.a objects files so
the objects files in libstatci1.a don't see them so the linker give "/
usr/ccs/bin/ld: Unsatisfied symbols"

If I extract the libstatic2.a object files:

ar -x libstatic2.a -->> libstatic2.objs

and attach them to libstatic1.a

ar rv libstatic2.objs *.o

I fix this last issue.

Is there a way to do this without extract the libstatic2.a object
files?

Thanks in advance,
Jose Luis

Paul Pluzhnikov

2007-02-21, 7:10 pm

"jose_luis_fdez_diaz" <gfiuni2@gmail.com> writes:

> Given these static libraries:
>
> - libstatic1.a
> - libstatic2.a
>
> I link they with a the "main" file: main.c
>
> aCC -lstatic1 -lstatic2 main.c

This is a bogus command line. Use:

aCC main.c -lstatic1 -lstatic2

and read this:
http://webpages.charter.net/ppluzhnikov/linker.html
if you want to understand why your order of libraries and
sources/objects is wrong.

> /usr/ccs/bin/ld: (Warning) The CTTI instantiation with key symbol
> "LBXRecord::~LBXRecord()" in file main.o has been overridden by an
> explicit definition in file lib/libstatic2.a. This behavior may not be
> supported in future releases.
>
>
> To fix this issue I appended libstatic2.a to libstatic1.a when I
> created it:
>
> ar libstatic1.a libstatic1.a *.o

This is even more bogus:

- I doubt that is *acutal* command you used;
you probably did "ar libstatic1.a libstatic2.a *.o"

- besides, the linker will not search libstatic1.a recursively; it
will simply ignore anything in libstatic1.a which isn't an object
(and libstatic2.a is not an object; it's an archive).

> Is there a way to do this without extract the libstatic2.a object
> files?

Yes: use correct link line.

Cheers,
--
In order to understand recursion you must first understand recursion.
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