Linking a shared library with another shared lib in linux

by

Suppose that libabc.so is obtained from posiition independent object code files abc1.pic.o and abc2.pic.o ; then you have built them with e.g.

 gcc -Wall -fPIC -O -g abc1.c -c -o abc1.pic.o
 gcc -Wall -fPIC -O -g abc2.c -c -o abc2.pic.o

and you build libabc.so with

gcc -shared  abc1.pic.o  abc2.pic.o -L/usr/local/lib -l123 -o libabc.so

I added -L/usr/local/lib before -l123 because I am assuming you have a /usr/local/lib/lib123.so shared library.

Read also the Program Library HowTo.

As you see, you may link a shared library lib123.so into your own shared library libabc.so

Then check with ldd libabc.so

You may want to set up some rpath in your libabc.so by adding -Wl,-rpath and -Wl,$RPATHDIR to the linking command.

For much more details, read Drepper’s paper How to write shared libraries

PS. Don’t use a static library for lib123.a (it should be PIC). If you link non-PIC code into a shared object, you lose most of the advantages of shared objects, and the dynamic linker ld.so has to do zillions of relocations.

More Related Contents:

  1. Compilation fails with “relocation R_X86_64_32 against `.rodata.str1.8′ can not be used when making a shared object”
  2. C/C++ with GCC: Statically add resource files to executable/library
  3. C++ Dynamic Shared Library on Linux
  4. How do you find what version of libstdc++ library is installed on your linux machine?
  5. Difference between shared objects (.so), static libraries (.a), and DLL’s (.so)?
  6. When / How does Linux load shared libraries into address space?
  7. How to check what shared libraries are loaded at run time for a given process?
  8. How to link using GCC without -l nor hardcoding path for a library that does not follow the libNAME.so naming convention?
  9. What are good practices regarding shared libraries on Linux?
  10. “relocation R_X86_64_32S against ” linking Error
  11. cmake find_package specify path
  12. What does exactly the warning mean about hidden symbol being referenced by DSO?
  13. How to force inclusion of an object file in a static library when linking into executable?
  14. How to add additional libraries to Visual Studio project?
  15. How to install the Raspberry Pi cross compiler on my Linux host machine?
  16. C++: what regex library should I use? [closed]
  17. How do I profile C++ code running on Linux?
  18. g++ linking order dependency when linking c code to c++ code
  19. gcc: undefined reference to
  20. Spinlock versus Semaphore
  21. Netbeans 7.2 shows “Unable to resolve identifier” , although build is successful
  22. Linking Libraries in Xcode
  23. How to enable core dump in my Linux C++ program [duplicate]
  24. How to create a temporary directory in C++?
  25. Get home directory in Linux
  26. C++ template, linking error [duplicate]
  27. /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version CXXABI_1.3.8′ not found
  28. Is there an equivalent to WinAPI’s MAX_PATH under linux/unix?
  29. library is linked but reference is undefined
  30. Load 32-bit shared library from 64-bit application?

Leave a Comment