How to specify custom libc++

Question

I have built libc++ and want to use it when compiling my program ? so I have something like

clang++ -stdlib=~/libc++/libc++.so main.cpp

but this does not work. How can use my custom built libc++ when building the application?

Have you tried using a absolute path? (`~` is not absolute). Also, specify what does not work? Do you have an error message? — hellow, Aug 14 '18 at 11:08
I've tried with absolute path as well, Clang says: "invalid library in argument -stdlib=~/libc++/libc++.so" — unresolved_external, Aug 14 '18 at 11:18
The `-stdlib=~/libc++/libc++.so` argument is invalid. Clang accepts `-stdlib=libc++`, and you have to add the library to your `PATH`. See [this](https://libcxx.llvm.org/docs/UsingLibcxx.html) for more details. — cantordust, Aug 14 '18 at 11:37
But I already have the default libc++, will it override it ? — unresolved_external, Aug 14 '18 at 12:42

score 6 · Accepted Answer · answered Aug 14 '18 at 13:15

This information comes from llvm documentation about libcxx.

If you want to use a custom libc++ with clang you have to specify argument like this :

$ clang++ -std=c++11 -stdlib=libc++ -nostdinc++ -I<path_to_libcxx>/include/c++/v1 -L<path_to_libcxx>/lib -Wl,-rpath,<path_to_libcxx>/lib main.cpp ${end_of_compile_line...}

Alternatively, you can put the path of your library in LD_LIBRARY_PATH (assuming you are under Linux) :

export LD_LIBRARY_PATH=<libcxx-install-prefix>/lib:$LD_LIBRARY_PATH

and compile using simply these options :

$ clang++ -stdlib=libc++ -nostdinc++ -I<path_to_libcxx>/include/c++/v1 -L<path_to_libcxx>/lib main.cpp -o ${end_of_compile_line...}

How to specify custom libc++

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