Re: [boost] [filesystem] operations.hpp Won't Compile with VC10 using Boost 1.47

Subject: Re: [boost] [filesystem] operations.hpp Won't Compile with VC10 using Boost 1.47
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2012-02-14 13:49:58

Stephan T. Lavavej wrote:
> [Robert Stewart]
> > When I try to include boost/filesystem/operations.hpp, my
> > code won't compile on MSVC 10 (Visual Studio 2010).
> > The error is from boost/filesystem/v3/config.hpp:49:
> > # if defined( BOOST_NO_STD_WSTRING )
> > #   error Configuration not supported: Boost.Filesystem V3
> and later requires std::wstring support
> > # endif
>
> First, check your command line. If it isn't defining the
> macro, preprocess with /P /d1PP . The second option is
> undocumented and unsupported, but extremely useful - it
> preserves #define directives, so you can see where macros are
> coming from.

I was looking for such an option!

BOOST_NO_STD_WSTRING didn't appear in the output.  This was a false alarm.  Why does VC print #error messages that are conditionally compiled and don't apply!

In this case, BOOST_NO_STD_WSTRING is *not* defined, yet the #error still appears in the output:

In file included from D:/.../Boost/boost_1_47/include/boost-1_47/boost/filesystem/operations.hpp:31,
                 from controller.cpp:22:
D:/.../Boost/boost_1_47/include/boost-1_47/boost/filesystem/v3/operations.hpp:21:5: #error Configuration not supported: Boost.Filesystem V3 and later requires std::wstring support

Emacs' compilation-mode dutifully marks that as an error and I didn't realize that the build progressed past that point.  Arrrggghhh!

Thanks for your help.

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer                     using std::disclaimer;
Dev Tools & Components
Susquehanna International Group, LLP  http://www.sig.com

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