Re: [Boost-users] [OSX] Multiply defined symbols between Function and Signals libs ?

Alo Sarv wrote:

I'v been compiling boost libraries objects straight into my application binaries on linux and OSX platforms (e.g. not using bjam/stat/dynlibs), and thus far it has worked. However, recently I started getting multiply defined symbols on OSX, namely _1, _2, _3 etc. Most likely they come between Boost.Function and Boost.Signals libraries (latter of which I started using recently).

_1, _2 and so on can come from either Boost.Bind or Boost.Lambda. If you are using Boost.Bind, these are defined in . Take a look at this file, and you'll see three different compiler-specific paths, of which you are probably using the last (g++ on OSX, right?) Since the placeholders are defined in an unnamed namespace, there shouldn't be any multiple definition errors, so it's probably a compiler bug. Check whether you have two source files with the same name, as this may be the cause. Otherwise, as a last resort, you may try editing placeholders.hpp so that one of the other #ifdef sections is selected.