On Thu, 2010-07-01 at 11:45 +0200,lazarus-requ...@lists.lazarus.freepascal.org wrote:
Hi, > Message: 6 > Date: Thu, 01 Jul 2010 19:30:26 +0200 > From: Hans-Peter Diettrich <drdiettri...@aol.com> > Subject: Re: [Lazarus] Parser > To: Lazarus mailing list <lazarus@lists.lazarus.freepascal.org> > Message-ID: <4c2cd0b2.7060...@aol.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Florian Klaempfl schrieb: > > >> A FP-propriety interface part would be added to the C units to make them > >> create an FP compatible compiled unit, usable in the normal way by > >> Pascal units and by the linker. > > > > > > ... and not fully automatable, so not better than current solutions. > > Even worse, it does not cover the cases which are really a problem like > > > > #define CONFIGURE_THE_HEADER_IN_A_CERTAIN_WAY // simple example are the > > UNICODE define in windows headers > > #include <myheader.h> > > > > Things like this are the really nasty corner cases which make h2pas only > > semi automatic. > > This is correct, and also is the most important reason for a tighter > integration of C source code into FPC projects. > > > Show me a tool which translates C headers fully automatic in *usable* > > pascal units (test case e.g. glibc and mysql), then we can continue this > > discussion. > > Just an idea: > > The compiler can create the required (ppu?) files, when compiling a C > module. That file then perfectly reflects all the settings, that > affected the code generation of that module. Only this "header" version > is important for the use of that module, not any other > (mis-configurable) header files. > > Likewise the compiler can use the information in the ppu file, instead > of those found in any #include file. There may exist some technical > problems with this solution, because C enforces no correspondence > between header and implementation files, neither by name nor content, > but I think that solutions can be found on a package base. > > When a package contains a couple of C files, then a common package > header/ppu file could contain the descriptions of *all* items in that > package, and a list of related header files. Then the compiler can skip > over the listed #include files, and use the precise information in the > ppu file instead. This model only requires the construction of packages > for all used C files, and a one-time compilation of these packages, for > the construction of their ppu files. The compiler or a related tool can > create an dummy Pascal library unit for every such package, for easy > (human readable) use of the C packages in Pascal code. > > DoDi I have been trying to follow this discussion but didn't know what part to quote. I was under the possibly mistaken impression that Delphi allowed the user to link in C/C++ code to a Delphi project. I have never done this. I assumed that Lazarus could link in GNU C/C++ code. Is this, or ever will it, be possible. What is stopping us from doing this? I for one would like to open some of the Linux AisleRoit Solitaire C/C++ applications and try to run one or two of it's functions thru' a C/C++ converter then open the original C/C++ project and patch in Lazarus code. I don't want to convert the entire C/C++ code to Lazarus cos this would cause waves with the AisleRoit development team which are very pro C/C++ but it would be nice to say "Hey, guys, have a look at this. It's your own code with a Pascal/Lazarus patch which improves and enhances the original game. How about making it your next version. See, you don't even need to change your original C/C++ to Lazarus. All you need do is install Lazarus and Bob's your Aunt Fanny... you've got Lazarus code patched into C/C++ code and the best of both worlds." You never know, this might open a whole new team of Linux developers using and improving the Lazarus compiler. My C/C++ skills are okay but very rusty. There is a good reason why I don't like C/C++ and choose Pascal over it. I have done a few C/C++ to Pascal/Delphi ports of Games; completely rewriting the code. I think that Pascal is more readable than C/C++ but also that the Linux world is full of die-hard C/C++ programmers and it is our duty to show that we can patch in Pascal code elegantly without needing to rewrite all of their work. Peter -- Proudly developing Quality Cross Platform Open Source Games Since 1970 with a Commodore PET 4016 with 16 KRAM http://pews-freeware-games.org (<--- brand new -- still under development) -- _______________________________________________ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
