Force g++/clang++ to use local `libstdc++.so`

Question

I am trying to compile a library using a specific version of libstdc++.so, not the system one.

The compilation script uses waf.

I tried to export LD_LIBRARY_PATH=<path/to/directory/of/my/libstdc++.so>. Since I use fish, I have also tried with set --export LD_LIBRARY_PATH <path/to/directory/of/my/libstdc++.so> and LD_LIBRARY_PATH=<path/to/directory/of/my/libstdc++.so> waf

However, until now it still links against the system libstdc++.so

Anyone knows how to force the usage of my libstdc++.so?

What doesn't work? Show your exact command and error messages. — n. m. could be an AI, Jun 04 '21 at 07:56
It works, but when trying to load it using the specific `libstdc++.so` (in my case the Julia's one) it fails, saying `GLIBCXX_3.4.26' not found` — fortea, Jun 09 '21 at 19:42
This probably means your version is too old and/or you are compiling against new version headers and linking against an old binary library. Please [edit] your question and add exact, complete and unedited build commands and error messages you are getting, formatted as code. — n. m. could be an AI, Jun 09 '21 at 19:56

Guy Marino · Answer 1 · 2021-06-03T17:04:58.157

You can set the standard library in clang using the -stdlib=<yours> flag. See here for more info: https://clang.llvm.org/docs/ClangCommandLineReference.html

EDIT: Leaving my past answer up there just so that it's a known edit, but you should be able to just use -nostdlib and optionally, -nostdinc, to compile your program. Then to supply your own standard library, just add it as a compiler argument. For example:

clang -nostdinc -nostdlib -I/custom/include/path foo.c /path/to/your/cstdlib.so

For more help configuring the linker, see this post.

Force g++/clang++ to use local `libstdc++.so`

1 Answers1