what means is defined in DSO /lib64/libz.so.1

Nils Philippsen nils at redhat.com
Tue Mar 6 17:28:08 UTC 2012

On Tue, 2012-03-06 at 18:21 +0100, Fabian Deutsch wrote:
> Am Dienstag, den 06.03.2012, 17:10 +0000 schrieb Sérgio Basto:
> > Hi , I found this error 
> > 
> > /usr/bin/ld: /usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../lib64/libgpac_static.a(base_encoding.o): undefined reference to symbol 'deflate'                                                              
> > /usr/bin/ld: note: 'deflate' is defined in DSO /lib64/libz.so.1 so try
> > adding it to the linker command
> > line                                                                                                   
> > /lib64/libz.so.1: could not read symbols: Invalid
> > operation                                            
> > collect2: error: ld returned 1 exit status
> DSO is something like an auto-symbol-resolver (so linking in libraries
> that are used by other directly-linked libraries, google for with with
> fedora).
> DSO is deactivated on fedora, therefor you need to pass each library
> required to the linker.

"DSO" means "dynamic shared object" and is more or less just another
word for "shared library".

> In the above case you need to additionally pass -lz to the linked (e.g.
> using LDLAGS=-lz), as suggested by gcc (which says: is defined in)

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