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On 02/10/2004, at 2:52 AM, Hatzenbeler, Tim wrote:
Whats the best way? The text I have seen recommends GENCSRC for
versions
5.1 and higher. But I like the #pragma idea more...
Any thoughs, were at version 5.2
The #pragma mapinc method is a much better idea. It guarantees that the
file definitions in the program match the definitions in the file.
However, last I knew, the Unix dweebs in charge of the AIX C++ compiler
port could not fathom how useful that is and did not put support for
#pragma mapinc in the compiler. I understand they were also intending
to remove it from the C compiler (I recall some note to that effect in
the Memo To Users or similar document). That's why the GENCSRC command
was created as a crappy work around for lost function.
The 530 C-C++ Programmers Guide still shows #pragma mapinc supported
for C and I could find no mention of it being dropped. However, C++
still does not support it.
On version 5 C compilers it seems you can continue to use #pragma
mapinc. If you intend to convert the C to C++ at some future stage or
start using C++ (though why anyone in their right mind would do that is
beyond me) then you should start using GENCSRC. You will have to
remember to regenerate the include source whenever you change the
underlying database file.
Appendix A of the C-C++ Programmers Guide says that #pragma mapinc
cannot generate include files in the IFS. I think that is meant to be a
warning that if you are using the IFS to hold C-C++ source then you
should use GENCSRC because #pragma mapinc won't work. I think that is
probably crap and that creative use of the INCLUDE environment variable
or symbolic links will solve this but I've had no need to prove that
supposition.
Regards,
Simon Coulter.
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