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Hello Scott,
Since many thorns in Cactus have multi-line equations, I'm not sure if using the cpp.pl script is an option for me.---Have other people not reported this problem?
Uhm, I think I should have given a slightly different suggestion re cpp. Please try "cpp --traditional" for FPP. The behaviour that you observed (turning the comment into a space when using /**/ ) is the ANSI C behaviour ( the standard requires this) while what we want is what pre-ANSI compilers used to do (remove comments without trace).
a ## b
should be turned into
ab
as the ANSI standard requires that whitespace surrounding ## is removed. Not sure why this does not happen, but FPP=cpp --traditional should do the trick (and is in fact the setting that you will find in simfactory's option lists, if not please report the file, it is a bug).
Yours, Roland
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