Static and Dynamic Linking with GCC

Static and Dynamic Linking with GCC

[Dan Mergens]

Is it possible to link with both static and dynamic libraries on a gcc
compile line? The -static option prevents dynamic linking, and in
version 3 you can choose the link mode for libgcc. However, I want to
know if I can specify the libraries to be link statically or
dynamically. For example, in IRIX you can do the following:

CC a.o -B static -lfoo -Bdynamic -lbar

which will link which libfoo.a, libbar.so, and the standard .so's

What is the equivalent gcc command line? (I'm beginning to think it
doesn't exist).

Thanks!
Dan Mergens

Re: Static and Dynamic Linking with GCC

[H . J . Lu]

On Fri, Jul 20, 2001 at 02:27:08PM -0700, Dan Mergens wrote:
> Is it possible to link with both static and dynamic libraries on a gcc
> compile line? The -static option prevents dynamic linking, and in
> version 3 you can choose the link mode for libgcc. However, I want to
> know if I can specify the libraries to be link statically or
> dynamically. For example, in IRIX you can do the following:
> 
> CC a.o -B static -lfoo -Bdynamic -lbar
> 
> which will link which libfoo.a, libbar.so, and the standard .so's

Assuming you are using the GNU binutils, do

# gcc a.o -Wl,-Bstatic -lfoo -Wl,-Bdynamic -lbar


H.J.

Re: Static and Dynamic Linking with GCC

[Phil Edwards]

On Fri, Jul 20, 2001 at 02:27:08PM -0700, Dan Mergens wrote:
> For example, in IRIX you can do the following:
> 
> CC a.o -B static -lfoo -Bdynamic -lbar
> 
> which will link which libfoo.a, libbar.so, and the standard .so's
> 
> What is the equivalent gcc command line? (I'm beginning to think it
> doesn't exist).

This is largely (and on many platforms, entirely) a function of the
linker, not the compiler per se.  The compiler driver ("gcc" or "g++",
etc) can pass arbitrary (comma-separated) options to the linker with -Wl,
so you need to read the man page for the linker you're using[*], figure out
which options to pass to it, and then feed those to gcc/g++.  For example,
on Solaris it's something like

    gcc a.o b.o ... z.o -Wl,-B,static -lfoo -Wl,-B,dynamic -lbar

and the linker receives

    ld ..... -B static -lfoo -B dynamic -lbar ....


Phil
[*] Run 'gcc --print-prog-name=ld' to get the full path to ld; then you
    can investigate that binary and determine which one is in use.

-- 
Would I had phrases that are not known, utterances that are strange, in
new language that has not been used, free from repetition, not an utterance
which has grown stale, which men of old have spoken.
                                     - anonymous Egyptian scribe, c.1700 BC