How to link to my own library in gcc?

Question

Command to build executable:
g++ -I../include/redis -L../lib/redis redis.cpp -o redis -lhiredis

Description:
I have libhiredis.so in ../lib/redis/ . And in /usr/local/lib/hiredis13/ , there are libhiredis.so and libhiredis.so.0.13 , this libhiredis.so is a symbol link to libhiredis.so.0.13 .Then I ldd redis , here is the result:

linux-vdso.so.1 =>  (0x00007ffd227f7000)  
libhiredis.so.0.13 => not found  
libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x00007f7ebca0d000)  
libm.so.6 => /lib64/libm.so.6 (0x00007f7ebc70b000)  
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f7ebc4f5000)  
libc.so.6 => /lib64/libc.so.6 (0x00007f7ebc132000)  
/lib64/ld-linux-x86-64.so.2 (0x00007f7ebcd23000)

Gcc should link to libhiredis.so in ../lib/redis/ , am I right?

Answer 1

Probably your library has a SONAME ( libhiredis.so.0.13 ) so the program records it instead of the name of the file. Then, in runtime, that SONAME is searched for in the usual directories.

Your library is in /usr/local/lib/hiredis13/ , and that is not a usual directory. The solution is one of the following:

• Add the /usr/local/lib/hiredis13 directory in /etc/ld.so.conf or /etc/ld.so.conf.d/* and re-run ldconfig .
• Export the environment variable LD_LIBRARY_PATH=/usr/local/lib/hiredis13 when running the program.
• Use the -rpath linker option.