Using g++ version 4.0.3

Hello everyone.

Since I'm using Arch Linux distribution, and I have gcc 4.0.3 as default C/C++ compiler,
I went into a bunc of problems compiling OpenCASCSADE library. Most of the compilation
errors was trigerred by missuses of copy constructors instead of copy operators and the
const correctness. Beside that I have found some memory leaks produced when someone
decided to avoid compiler error messages by using local memory allocation, but without
proper dealocation.

I decided to correct all of them and to modify the source files until compilation went
smoothly. Finally I did it.

First of all, I decided not to expose private constructors, but instead I opted to use
copy operators. So I replaced (for example):

  MEOUT.Bind(E,TopTools_ListOfShape());

with:

  TopTools_ListOfShape tmpListOfShape;
  MEOUT.Bind(E,tmpListOfShape);

That's way I forced the compiler to use copy operator, as expected by the author.

Second, the most of the errors was related to incorrect use of const keyword,
especially const char* pointers.

For example, in the inc/Standard_TypeDef.hxx was the declaration:

typedef char* Standard_CString;

All around the code there was the const Standard_CString declarations.
But, instead of const char*, compiler interpreted it as char const*.

Consider the following code:

typedef char* StringType;

class Options
{
public:
  Options(const StringType var) {}
};

int main()
{
    const char* cPtr = "Pero";

    Options o(cPtr);

    return 0;
}

Compilation gives:

g++ -o proba proba.cc
proba.cc: In function ‘int main()’:
proba.cc:13: error: invalid conversion from ‘const char*’ to ‘char*’
proba.cc:13: error:   initializing argument 1 of ‘Options::Options(char*)’

So I decided to replace typedef with #define statement. I know, it was not an ideal
solution, but it was the quickest one I could remember.

All in all, I have prepared the patch with all the corrections I've made so, if
someone wish to apply it and investigate, the patch can be downloaded from:

http://free-pu.t-com.hr/Bernard-Cupic/OC.5.2-gcc4.patch.bz2

Please note that the patch is created against local cvs repo, and the repository is my
local disk at: /radni/cvsroot. So, in order to be applied, it should be edited using
the sed editor and every occurrence of /radni/cvsroot should be replaced with some other
cvs repo.

I didn't notice any strange behaviour in DRAWEXE as well as in FreeCAD application,
that was built on top of OC code, but my testing was not so thorough so I can't
claim that I haven't introduce any other error.

I can only hope that my contribution will be usefull for the comunity.

Regards, Berni.

P.S. You can reach me at bernard.cupic@pu.t-com.hr but, please, put the [OC]
at the front of the subject so I can be sure that my spam filter won't vanish
your message.