GTK+ Forums

dreblen · Posted: Thu May 15, 2008 4:54 pm Post subject: multiple static libraries

Hi,
maybe I'm just having a brain lapse, but this is really getting to me, so I figured I'd ask for help.

I have two static libraries (libncString, libncUI), libncUI calls functions from libncString.
In my testing program, if I call a function in libncUI that depends on libncString, it will give undefined reference errors, but if I call an ncString function somewhere in my test program, it compiles and runs just fine.

examples:

Code: (C)
1 2 3	/* this one fails to link / / nc_menu_add_menu() calls nc_strip_char(), which is in libncString */ nc_menu_add_menu(&NC_MENUBAR(mbar)->mdat, "/", "File");

Code: (C)
1 2 3	/* this one links and runs fine */ nc_strip_char("test", 't'); nc_menu_add_menu(&NC_MENUBAR(mbar)->mdat, "/", "File");

if I'm missing something, I'd really appreciate some help.
Thanks...

dreblen · Posted: Thu May 15, 2008 7:05 pm Post subject:

okay, it turns out it was just an error in my link command (-lncString wasn't in the spot it should have been).
however, I'm still curious as to why it compiles fine if I have a call to an ncString function in my test program.
Thanks...

idelovski · Joined: 21 Oct 2007 Posts: 4

Try reversing libraries in your make file. If I understand you well, I think
this is documented feature of linkers - they are optimizing unused code.

dreblen · Posted: Thu May 15, 2008 7:16 pm Post subject:

yes idelovski, that was the problem, I looked up gcc linker options ( http://gcc.gnu.org/onlinedocs/gcc-3.4.6/gcc/Link-Options.html#Link-Options ) and corrected it.
Thank you.