gcc dynamic link switches

jungle · 05-29-2009, 10:19 AM

I am trying to use a shared bzip2 library in a program i'm writing. For the life of me I can't figure out the correct gcc switch to link it in. I've tried pkg-config, but i don't know the name of the .pc file.

is there any rule for these things? i've had this problem before and never managed to find a good solution.

bill

David1357 · 05-29-2009, 12:30 PM

Quote:

Originally Posted by jungle

For the life of me I can't figure out the correct gcc switch to link it in.

Have you tried passing the "-l" option to GCC when linking?

Code:

# gcc -o <output> <object file names> -lmine

The above will attempt to link "libmine" with the rest of your object files.

You might have to specify the path to the library:

Code:

# gcc -L/path/to/libmine.so -o <output> <object file names> -lmine

NOTE: These examples assume you are trying to link to a shared version of the library.

knudfl · 05-29-2009, 01:22 PM

Programming with libbzip2
http://linux.math.tifr.res.in/manual.../manual_3.html

http://www.pelicanprogramming.com/tu...ip2_prog1.html

http://www.opensource.apple.com/sour...text#top-level
Quote :
Programming with libbzip2.
To use any part of the library, you need to #include <bzlib.h>
.....
There is no '.pc ' file for libbzip2(-devel), AFAIK.
.....

jungle · 05-29-2009, 05:38 PM

i figured it out. i wasn't completely clear with my first post. i knew that i needed a "-l***" switch, but I didn't know what the ****'s were. I've found out that it's actually the name of the library. it took a while to find out the name of the library. i finally used

Code:

$ rpm -ql bzip2-libs
  /lib/libbz2.so.1
  /lib/libbz2.so.1.0.4

therefore the correct switch was

Code:

gcc -lpng12 -lbz2 prog1.c

i used libpng as well.

bill