If you run g++ with the -v flag, you’ll see the link line it uses. Here’s a simple example program: #include <iostream> int main(void) { std::cout << “Hello, world!” << std::endl; return 0; } And the output from running g++ -v -o example example.cpp: Using built-in specs. Target: x86_64-linux-gnu Configured with: ../src/configure -v –with-pkgversion=’Ubuntu/Linaro 4.4.4-14ubuntu5.1′ … Read more
Here’s a solution for this problem in Ubuntu 16.04 sudo add-apt-repository ppa:ubuntu-toolchain-r/test sudo apt-get update sudo apt-get install gcc-4.9 sudo apt-get upgrade libstdc++6 You can check if you get GLIBCXX desired version like this: strings /usr/lib/x86_64-linux-gnu/libstdc++.so.6 | grep GLIBCXX
The indirect initialization syntax with a braced-init-list your code is using is called copy-list-initialization. The overload resolution procedure selecting the best viable constructor for that case is described in the following section of the C++ Standard: ยง 13.3.1.7 Initialization by list-initialization [over.match.list] When objects of non-aggregate class type T are list-initialized (8.5.4), overload resolution selects … Read more
std::array is funny. It is defined basically like this: template<typename T, int size> struct std::array { T a[size]; }; It is a struct which contains an array. It does not have a constructor that takes an initializer list. But std::array is an aggregate by the rules of C++11, and therefore it can be created by … Read more
What you’re seeing is the use of inline namespaces to achieve ABI versioning. What that means: The libstdc++ std::string is a different data structure than the libc++ std::string. The former is a reference counted design, whereas the latter is not. Although they are API compatible, they are not ABI compatible. That means that if you … Read more
On Linux: In general, all commonly available linux distributions will use libstdc++ by default, and all modern versions of GCC come with a libstdc++ that supports C++11. If you want to compile c++11 code here, use one of: g++ -std=c++11 input.cxx -o a.out (usually GNU compiler) g++ -std=gnu++11 input.cxx -o a.out On OS X before … Read more
tl;dr This is the result of a really long series of hacks to implement the insane overload/explicit rules of std::pair and maintain ABI compatibility. It is a bug in C++20. Disclaimer This is more of a “fun” ride along with the standard library authors down memory lane then some insightful language level revelation. It shows … Read more
Locked. Comments on this answer have been disabled, but it is still accepting other interactions. Learn more. <regex> was implemented and released in GCC 4.9.0. In your (older) version of GCC, it is not implemented. That prototype <regex> code was added when all of GCC’s C++0x support was highly experimental, tracking early C++0x drafts and … Read more
That blog post is pretty inaccurate. As far as I know C++ ABI changes have been introduced with every major release of GCC (i.e. those with different first or second version number components). Not true. The only C++ ABI changes introduced since GCC 3.4 have been backward-compatible, meaning the C++ ABI has been stable for … Read more
I would use the native library for each OS i.e. libstdc++ on GNU/Linux and libc++ on Mac OS X. libc++ is not 100% complete on GNU/Linux, and there’s no real advantage to using it when libstdc++ is more complete. Also, if you want to link to any other libraries written in C++ they will almost … Read more