one more thing

Brian Dessent
Fri Sep 21 03:38:00 GMT 2007

patrickinminneapolis wrote:

> example_wrap.c includes <cstudio>, but gcc can't find it, can you tell me
> how to tell gcc to look in c:\Program Files\Microsoft Visual Studio
> 8\VC\include\ for it?

Setting aside for a moment the fact that you're trying to do something
totally wrong and broken, the reason the compiler cannot find <cstdio>
is that you named the file with a .c extension and are compiling it with
gcc.  If you want to use C++, you need to compile with g++.  If you name
your files with C++ extensions (.cc, .cpp, .C) then gcc will be able to
detect that you want C++ mode and that will also work, however you will
likely get linking errors if you try to link with gcc when you should be
using g++.  In other words: always use g++ when compiling or linking C++

With that out of the way, you're trying to do something nutso by telling
gcc to use MSVC's C++ headers.  There's no way that's going to work. 
Implementations of C++ standard libraries and headers are very tightly
bound to internal details of the compiler, so you have to use gcc's
<cstdio> if you want to use C++ -- and you shouldn't ever need any
special flags to get the compiler's own C++ headers, providing that you
invoke the right driver.  And even if C++ headers were not tied to the
compiler implementation, g++ and MSVC++ implement different ABIs so
trying to link C++ objects/libraries across vendors will fail.

The only exchange of headers that typically works is when you are
dealing with pure C only, and when the headers are designed to be
generic and portable.  Otherwise, don't expect to be able to point gcc
at MSVC internal headers and have anything but great failure.


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