Author: Heiner Marxen
Date: 09:50:46 02/15/00
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On February 14, 2000 at 18:43:16, Daniel Clausen wrote: >Hi > >>>#include "search.c" >>>#include "board.c" >>>#include "data.c" >>>#include "eval.c" >>>#include "main.c" > >>This may, for reasons that are beyond me (no CS background btw), make >>wintel-centric compilers improve the code generated, but it is _not_ portable, >>and unless I am wrong, it is _not_ standard C. >> >>If someone could clarify this, I would appreciate it. If by chance I am wrong, >>my appologies Dan. But it won't compile like this in Codewarror. > >As far as I know, the C-language definition doesn't *forbid* to include c-files >directly. The reasons why it didn't compile is prolly one of the following: > >1 In your project you should only add the one file containing Dan's funny > includes. Don't add the other files to the project or you'll end up with > "duplicate definitions" etc. Just make sure that you'll add the path for > the rest of the .c files to your project. > >2 If you did that it will prolly fail because there are no #ifndef's in > Tom's header files. Therefore you'll most prolly will end up with msgs > saying "identifier <whatever> redeclared" and stuff like that. > > To prevent this you can add the following stuff in the header files. > > #ifndef __MYHEADERFILE_H__ > #define __MYHEADERFILE_H__ > > <rest of header file> > > #endif /* __MYHEADERFILE_H__ */ > > If the same headerfile will be included more than once the #ifndef will > cause the compiler (or more the preprocessor) to 'ignore' it the 2nd time. > > Note that a lot of people often use _MYHEADERFILE_H_ instead. (only one > leading/trailing underscore) While this may work fine in most cases, it's > not nice, since symbols starting with 1 underscore belong to the compilers > namespace. 7.1.3 Reserved identifiers All identifiers that begin with an underscore and either an uppercase letter or another underscore are always reserved for any use. Heiner >Kind regards, > -sargon
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