id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
3090	Include file_lock.hpp in two compilation units results in multiple definitions at link time (win32)	jkp@…	Ion Gaztañaga	"Including the file #include ""boost/interprocess/sync/file_lock.hpp"" from two seperate compilation units results in multiply defined symbols.  

The reason is that the following symbols contain nested class definitions.

static inline bool unlink_file(const char *filename);
static inline bool get_file_name_from_handle_function
   (void * hFile, wchar_t *pszFilename, std::size_t length, std::size_t &out_length);

Moving the definitions for the functions to a source file and compiling that into the library instead solves the issue.  

You can prove that the issue is the nested structs / classes by commenting out the function bodies.

This is a pretty serious issue since it pretty much means you cannot use boost interprocess under windows right now.

I'm compiling under MSVC8.1.  The issue does not present itself under GCC, but then, these function implementations are win32 specific."	Bugs	closed	To Be Determined	interprocess	Boost 1.39.0	Showstopper	duplicate	multiple definition symbol windows