[Insight-developers] Who defines GNU_LIBSTDCXX_V3?

[Bill Hoffman]

I have talked to the vnl folks about this.  They have found
the V3 libstdc++ to be incomplete and buggy.   They have made
changes to vnl that make it work, but I have not incorporated those
changes into Insight yet.   So, for now I would not go out of your
way to install the V3 library.  Use the library that is bundled with
gcc 2.9.5 and everything should work.

-Bill


At 04:11 PM 9/25/00 -0400, Paul Hughett wrote:

>I am trying to compile Insight with gcc 2.95.2 and gnu libstdc++
>2.90.8 but the compilation fails when it tries to find the header file
>vector.h.  When I look at the relevant code (e.g. in vcl_vector.h), it
>tries to include <vector> if the macro GNU_LIBSTDCXX_V3 is defined but
><vector.h> if it isn't.  (I have simplified the logic somewhat.)  Now
>this macro should presumably be defined if gnu libstdc++ v3 is
>installed and gnu libstdc++ 2.90.8 advertises itself as v3.
>Nevertheless, GNU_LIBSTDCXX_V3 is never--as far as I can tell--defined
>anywhere in the libstdc++ headers or in the configure scripts for
>Insight.
>
>So--have I correctly understood what GNU_LIBSTDCXX_V3 should mean?  Then
>why is it never defined?  Where should it be defined?
>
>Paul Hughett
>
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