[Users] Mojave|Simfactory|Fortran(thorn): F90 compiler rejecting "_##" in var names

Scott Hawley scott.hawley at belmont.edu
Fri Dec 20 00:58:23 CST 2013

Aha!  That's the missing piece.   

Also, FWIW, apparently in Apple's latest OS "Mavericks", cpp does not support macro concatenation via ## like the true GNU compilers do. (I tested this; I copied and pasted example source from the GNU manual.) Furthermore it ignores the "--traditional" flag, i.e. generates no warning or error if you supply the flag, but it has no effect on the behavior.

So!  Problem solved.  The fix is to  specify FPP= in the options file with the --traditional flag, using a true GNU compiler such as from MacPorts.    No modifications to cctk_Types.h is necessary.

Thanks Roland!   


> On Dec 20, 2013, at 12:28 AM, "Roland Haas" <roland.haas at physics.gatech.edu> wrote:
> Hash: SHA1
> 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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