Re: using a static library in a shared library?

[pkurpis at keck dot hawaii dot edu (Peter Kurpis)]

I think you could do this, if your .o files in the .a were compiled 
with  -fPIC  (which is a requirement for *any* .o files going into
your .so file).  (I haven't tried it, but I can't think of a reason 
why it shouldn't work.)

An additional point, however, which may be relevant:

I recently was building a .so file using  g++ -shared  and got
similar symptoms to what you describe below, also on solaris 8.
I was *not* using a .a file, and all my .o files were compiled
with  -fPIC .  So it really puzzled me...

What it turned out to be was that  ld  was balking at three
of my .o files.  I don't know why the three were singled out
from the over a dozen others, but the problem was fixed by
going from 

	g++ -shared ...

to 

	g++ -Wl,-G -Wl,-dy ...

[Note that's "capital W, lowercase ell -- not numeric one."]

Apparently,  -shared  passes  -G  and  -dy  to  ld , as I do
in the second instance, but also passes  -z text , which ld did
not like for the three  .o  files.

Note that I use the solaris ld (i.e.  /usr/ccs/bin/ld , not the 
GNU ld -- I configured gcc with the solaris ld for compatibility
reasons).

Note also that this was using g++ to link, not gcc as you do 
(although I would suppose I'd have had a similar problem with gcc).  

Anyways, I don't know whether this is relevant to you, but in case
it is, it's hard to figure out (at least it was for me :( ), so I 
wanted to spare you some pain.

> From gcc-help-return-9525-pkurpis=keck.hawaii.edu@gcc.gnu.org Mon Jul 15 00:08:22 2002
> 
> Is it possible to build a shared library that contains a static library?
> In other words, I want to create something called libmyshared.so which
> uses functions in something called libcus.a.
> 
> I'm using gcc 2.95.3 on Solaris 8.
> 
> When I type:
> 
> gcc -shared -o libmyshared.so mytest.o
> /export/home/CASmf/SunOS/obj/libcus.a
> 
> I get a huge long list like this:
> 
> Text relocation remains                         referenced
>     against symbol                  offset      in file
> <unknown>                           0x19f0
> /export/home/CASmf/SunOS/obj/libcus.a(cusapi2.o)
> <unknown>                           0x19f4
> /export/home/CASmf/SunOS/obj/libcus.a(cusapi2.o)
> <unknown>                           0x19f8
> /export/home/CASmf/SunOS/obj/libcus.a(cusapi2.o)
> <unknown>                           0x19fc
> /export/home/CASmf/SunOS/obj/libcus.a(cusapi2.o)
> <unknown>                           0x244c
> /export/home/CASmf/SunOS/obj/libcus.a(cusapiint.o)
> <unknown>                           0x2450
> /export/home/CASmf/SunOS/obj/libcus.a(cusapiint.o)
> 
> ending with:
> 
> ld: fatal: relocations remain against allocatable but non-writable
> sections
> collect2: ld returned 1 exit status