Re: separate keyword and separate compilation with GNAT?

["W. Wesley Groleau (Wes)" <wwgrol@PSESERV3.FW.HAC.COM>]

Someone complained about the incredible length of time it would take to
compile a "large" system with GNAT due to GNAT's method of also compiling
subunits.  A similar complaint could be made about the need to "re-compile"
EVERYTHING higher on the dependency tree.

HOWEVER: I know of TWO (independent) commercial compilers with "library"
systems which get corrupted any time you make the slightest change to the
dependency tree.  Add a 'with' or a 'separate' and you have to remove
the library and start over.  One of the compilers was used for a system
that had 14,000+ source files and took 16 hours to compile.  That particular
library structure also seemed to get corrupted if a resource problem
(not an Ada error) interrupted compilation of one unit.  Subsequent units
would raise complaints about other units (already with-ed many times).
Start over! (sigh).

The moral of the story is ... GNAT's not so bad!  GNAT's ADVANTAGE in the
above scenario is that it can compile in parallel as many files as you have
CPUs--both of the above compilers severely restricted multiple access to
libraries.

P.S. Some don't include spelling on their list of talents.  Let's do
them a favor and not propagate examples of incorrect spelling
(i.e., "seperate").  (But I'm NOT suggesting we flame the person whose
typo has been propagated.)
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W. Wesley Groleau (Wes)                                Office: 219-429-4923
Magnavox - Mail Stop 10-40                               Home: 219-471-7206
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