libc++

Xcode 4.6, iOS SDK 6.1, tesseract-ocr 3.02 Since the last OpenCV versions are built using libc++ , and tesseract-ocr is built using libstdc++ , they can't be used together in one xcode project. So, I'm trying to build tesseract using libc++. Using the script here (updating the base sdk and deploy target to 6.1), tesseract is being built just fine, and works in my xcode project once the C++ standard library is set to the compiler default. Than, I tried altering the script to build it with libc++, according to the answer here . I changed CXX to point to clang++ , and added -stdlib=libc++ to the

I am wondering what is the right/easy way to install a binary libc++ on Ubuntu, in my case Trusty aka 14.04? On the LLVM web site there are apt packages http://apt.llvm.org/ and I have used these to install 3.9. However these packages don't seem to include libc++. I install the libc++-dev package but that seems to be a really old version. There are also binaries that can be downloaded http://llvm.org/releases/download.html#3.9.0 . These do seem to contain libc++ but I'm not sure if I can just copy bits of this into places like /usr/include/c++/v1, in fact I'm not really sure what bits I would

I'm trying to compile a test case that employs dynamic_cast using libc++, which was compiled according to "Build on Linux using CMake and libsupc++" . #include <iostream> struct A { virtual void f(){ std::cout << "Virtual A" << std::endl; } virtual ~A(){} }; struct B : public A { void f() { std::cout << "Virtual B" << std::endl; } virtual ~B(){} }; int main() { A *a = new B; B *b = dynamic_cast<B *>(a); delete a; } I'm on ubuntu 13.04 and compiling with clang++ -std=c++11 -stdlib=libc++ . Why I'm getting undefined reference to '__dynamic_cast' ? How to solve it? EDIT Looks like it has

I am having a difficult time configuring an iOS project which uses a static library linked against the old libstdc++ that gcc used. That library is 32 and 64-bit. There are 6 libraries (libssl.a for example) that are 32-bit and must be updated. If I compile those libraries from source, they will be automatically linked with libc++, which will result in my linker complaining. Therefore, here are my questions: 1) Is there any way to have a single static library inside the project use libstdc++, and have the others use libc++? 2) How can I compile libraries from source (like libcrypto and libssh)

It's common to inherit from enable_shared_from_this just to be able to return shared_ptr 's from member functions as the primary intention, with no intention of exposing enable_shared_from_this API in the derived class. Since to make use of enable_shared_from_this one must do so through public inheritance (does the standard mandates this? what's the rationale?), this can't be achieved and enable_shared_from_this API is forced into derived class public API. Inherenting enable_shared_from_this privately and making shared_ptr a friend class do work on clang coupled with libc++, but doesn't work

I think this is part of the problem at No type named 'unique_ptr' in namespace 'std' when compiling under LLVM/Clang . According to Marshall Clow , I can detect -stdlib=libc++ via _LIBCPP_VERSION : If you're writing cross-platform code, sometimes you need to know what standard library you are using. In theory, they should all offer equivalent functionality, but that's just theory. Sometimes you just need to know. The best way to check for libc++ is to look for the preprocessor symbol _LIBCPP_VERSION. If that's defined, then you're using libc++. #ifdef _LIBCPP_VERSION // libc++ specific code

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