配置CMake以遵循符号链接

Question

In Linux, Consider there is test.so file. It requires other .so (for example alpha.so, beta.so, charlie.so)file during runtime. Its basically a shared library. When I run the following command in the terminal:

$ ldd test.so

following output was displayed:

alpha.1.4.so ==> usr/lib/x86-linux-gnu/alpha.1.4.so
beta.1.4.so ==> usr/lib/x86-linux-gnu/beta.1.4.so
charlie.1.4.so ==> usr/lib/x86-linux-gnu/charlie.1.4.so

I want to modify the cmake which is used for building the test.so to point to symlink, like this

alpha.so ==> usr/lib/x86-linux-gnu/alpha.1.4.so
beta.so ==> usr/lib/x86-linux-gnu/beta.1.4.so
charlie.so ==> usr/lib/x86-linux-gnu/charlie.1.4.so

rather than linking it to the specific version of that library ( alpha.1.4.so , beta1.4.so , charlie.1.4.so ).

How can I modify my CMake configuration to make the test.so file to follow symlink rather than the specific version? I basically want to make it version independent.

Answer 1

For disable soname part in the library linking, set NO_SONAME property:

set_target_properties(<library-target> PROPERTIES NO_SONAME OFF)

You may use this command for each library target, created in your project, or use it once by listing all targets to which it should be applied:

# Collect all library targets somehow
set(LIBRARY_TARGETS <library-target1> <library-target2> ...)
# And set the property for all of them
set_target_properties(${LIBRARY_TARGETS} PROPERTIES NO_SONAME OFF)

---

They said there is CMAKE_SHARED_LIBRARY_SONAME_C_FLAG variable, which affects on all targets. But it seems that this variable works only in toolchain scripts, not after them.

Answer 2

The solution by @Tsyvarev will fit for dynamic library whose SO_NAME do not contains version in it.

But in my case the SO_NAME of the .so file contains the version number in it. Though it is not recommended to have a version number in SO_NAME some library does it. I have modified the .so file using patchelf command in linux.

patchelf --set-soname dynamic_lib.so dynamic_lib.so.version_number

This will change the SO_NAME of the library.