Thanks to the work of Andrej Belym, Debian has now a new C++ standard library. This work has been done in the context of the Google Summer of Code 2012.
Available in Debian Experimental, this new packages provides both the runtime libraries (libc++abi1) and the C++ headers (libc++-dev).
With this library, it is possible to build a C++-based program without any dependency on libstdc++.
For example, as detailed in README.Debian, with the (amazing) C++ code:
// foo.cpp
#include <iostream>
int main() {
std::cout < < "plop" << std ::endl;
return 0;
}
with clang++ (or g++) will give:
$ clang++ -o plop foo.cpp
$ ldd plop |grep c++
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f15791cb000)
Using libc++, it will drop the dependency on libstdc++ to use lib++
$ clang++ -stdlib=libc++ -o plop foo.cpp
$ ldd plop |grep c++
libc++.so.1 => /usr/lib/x86_64-linux-gnu/libc++.so.1 (0x00007f87464df000)
For the record, it is not that trivial to do with g++. The command being:
g++ -nostdlib -lc++ -lc++abi -std=c++11 -o plop /usr/lib/x86_64-linux-gnu/crt1.o /usr/lib/x86_64-linux-gnu/crti.o foo.cpp /usr/lib/x86_64-linux-gnu/crtn.o -isystem/usr/include/c++/v1 -lc -lgcc_s
Besides this change, libc++ provides a support of C++ 11, considered as "correct" against the C++11 standard by upstream.
// bar.cpp
#include <chrono>
int main() {
return 0;
}
clang++ -stdlib=libc++ -o bar bar.cpp
More information:
