CODEWITHSUNDEEP
c++linkershared-librariesclang
abyss.7
abyss.7

Reputation: 14462

How to prefer one library location vs. another one with Clang?

I have a system-wide libc++.so in /usr/lib64. I want to link my binary against another libc++.so which is located somewhere else, say, in $HOME/.local/lib. Also, I want to be able to find all other libraries the same way as before, assuming that $HOME/.local/lib contains only libc++.so.

I'm trying to do this like: clang++ -L$HOME/.local/lib -lc++, but the compiler still links against /usr/lib64/libc++.so.

How to force the compiler (or linker) to link against a specific library location?

Upvotes: 1

Views: 815

Answers (1)

Pradhan
Pradhan

Reputation: 16737

-L adds the directory to the search path used by the linker. This has no effect on the search paths used at runtime. At runtime, the search paths, in order, are:

  1. The environment variable LD_LIBRARY_PATH
  2. rpath specified in the executable
  3. System library path

While you can achieve what you want by specifying the environment variable LD_LIBRARY_PATH=$HOME/.local/lib, it is a bad solution since it modifies the search paths of all executables. Specifying the rpath is a much cleaner solution since it only affects the behaviour of your executable. You can do this through the linker option of your toolchain, which is likely -rpath. So the command would be clang++ -rpath $HOME/.local/lib -lc++.

Upvotes: 1

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