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
– hellow, Commented Aug 14, 2018 at 11:08
I've tried with absolute path as well, Clang says: "invalid library in argument -stdlib=~/libc++/libc++.so" — unresolved_external
– unresolved_external, Commented Aug 14, 2018 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 for more details. — cantordust
– cantordust, Commented Aug 14, 2018 at 11:37
But I already have the default libc++, will it override it ? — unresolved_external
– unresolved_external, Commented Aug 14, 2018 at 12:42

Clonk · Accepted Answer · 2018-08-14 13:15:11Z

6

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...}

answered Aug 14, 2018 at 13:15

Clonk

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