hello DaveK and Andrew. Thanks. Now I am clear on this question and know where I send my question on how to use gcc.:-) Thanks for your kind help again. Regards XiaGuangTai 2007-8-21 On 8/20/07, Dave Korn <dave.korn@xxxxxxxxxx> wrote: > On 20 August 2007 10:16, summer xia wrote: > > > Hello all. > > > > I am porting a application from Windows into Linux. > > This list is about internal development of the gcc compiler itself. For > help about the use of the compiler and programming, please use the gcc-help > list. (I have set the follow-up to point there). However, just to quickly > answer: > > > when I use these libraries. I alway find that the gcc link the error > > class(I use the gdb to debug it), such as when I use the class CSky in > > the module B, I suppose that this class should use this module > > internal implement( this is to say use CSky implement in the library > > B). But it is surprised to me that CSky uses the library A implement. > > I wonder to know whether it is a bug to gcc or a feature that all > > modules must use the different class name or use the namesapce to > > distinguish these same class name. > > It is absolutely the case that you must use different classes or namespaces > to separate the two implementations; otherwise you are violating the ODR (One > Definition Rule), which is a fundamental rule of the C++ language spec. > Combining incompatible libraries that use some of the same names is one of the > main uses of namespaces. > > cheers, > DaveK > -- > Can't think of a witty .sigline today.... > >
