How to compile/link Boost with clang++/libc++?

Question

The answer to this question Why can't clang with libc++ in c++0x mode link this boost::program_options example? states "You need to rebuild boost using clang++ -stdlib=libc++."

I'm using MacOS Lion with clang v3.0. How do I build Boost v1.48.0 using clang and link it with libc++?

Update: I've created a user-config.jam file with the following:

using clang-darwin

...which will build Boost with clang instead of gcc. How do I link with libc++ instead of libstdc++?

Million

Answer 1

I didn't know how to do this either. But after poking around in here, the getting started, and trial and error:

$ ./bootstrap --with-toolset=clang
$ ./b2 clean
$ ./b2 toolset=clang cxxflags="-stdlib=libc++" linkflags="-stdlib=libc++"

You'll get lots of warnings. And the signals library will fail to build due to LWG 2059. But otherwise I think it works.

Dymphia

Just to add, boost::signals2 (#include <boost/signals2.hpp>) has a similar API to boost::signal and is header only, so not being able to build signals may not be so bad. – Preeminence

Is it just boost::signal not getting built? I think I am missing a lot of variants when build complete – Allergen

nevermind. i think the bootstrap for boost wasn't finding iconv for some reason and cause it not build some of my boost variant – Allergen

This saved my day! It compiles fine with no warnings latest Boost 1.62 with Apple LLVM ver 7.0.2. – Sickening

Note that depending on one's system, one might also need to explicitly use update-alternatives to configure aliases for clang++ (otherwise b2 can't find the proper toolset). The packages from apt.llvm.org don't set these aliases automatically. – Dietz

On Windows, the toolset is clang-win – Longinus

Answer 2

Another option is to use Homebrew:

brew install boost --c++11

To get information on all options use:

brew info boost

Madel

Does this link against libc++ instead of libstdc++? – Carburize

if clang is available it links with libc++. – Madel

I ran "brew install boost --c++11" followed by "otool -L /usr/local/Cellar/boost/1.57.0/lib/libboost_regex-mt.dylib" and can confirm that Boost is now linking against libc++. Thanks! – Digress

Related lines in brew's boost formula - github.com/Homebrew/homebrew/blob/c77a584/Library/Formula/… – Swipe

Does this have boost::mpl? – Sacramental