Scott

(Sorry for being busy earlier.)

I am not aware of a system where isnan is not defined; hence putting things into #ifdef won't help you -- you do have isnan.

Your problem is likely a syntax error because you forgot to enclose the if condition into parentheses: if (isnan(6.0)) {}

In C++, there are compilers that closely follow the C++ standard, and there are older compilers that don't, and which instead follow the C standard. That makes it difficult to use isnan, and Cactus thus works around this to provide isnan as specified in the C++ standard. It does so by first "capturing" isnan in whichever way it is provided by the compiler, then providing a function Cactus::good_isnan that is known to work, and then defining a macro isnan that expands to "Cactus::good_isnan". This mechanism explains your error regarding "Cactus".

-erik

On Thu, Jun 13, 2013 at 6:41 PM, Scott Hawley <scott.hawley@belmont.edu> wrote:

Hi, I'm confused as to why using "isnan" should produce an error involving
"Cactus". I've pulled code out and reduced it to a mere isnan call, and
even placed it within HAVE_ISNAN....

#ifdef HAVE_ISNAN
if isnan(1.0) {}
#endif

(Ultimately I want isnan(gxx[CCTK_GFINDEX3D(cctkGH, i,j,k)]) in there...)

Here's the error:

%make bruiser SILENT=no
..
COMPILING
/Users/shawley/Cactus/arrangements/Bruiser/BruiserConstraints/src/BruiserUt
il.cc
current_wd=`pwd` ; cd /Users/shawley/Cactus/configs/bruiser/scratch ;
/opt/local/bin/g++-mp-4.7 -m64 -fopenmp -g -O0 -O2 -c -o
$current_wd/BruiserUtil.cc.o $current_wd/BruiserUtil.cc
-I"/opt/local/include/openmpi" -I"/opt/local/include/openmpi"
-I"/opt/local/include/openmpi" -I"/opt/local/include/openmpi"
-I"/Users/shawley/Cactus/arrangements/Bruiser/BruiserConstraints/src"
-I"/Users/shawley/Cactus/arrangements/Bruiser/BruiserConstraints/src/includ
e" -I"/Users/shawley/Cactus/configs/bruiser/config-data"
-I"/Users/shawley/Cactus/configs/bruiser/bindings/include"
-I"/Users/shawley/Cactus/src/include"
-I"/Users/shawley/Cactus/arrangements"
-I"/Users/shawley/Cactus/configs/bruiser/bindings/Configuration/Thorns"
-I"/Users/shawley/Cactus/configs/bruiser/bindings/include/BruiserConstraint
s" -I"/opt/local/include/openmpi" -I"/opt/local/include/openmpi"
-I"/opt/local/include/openmpi" -I"/opt/local/include/openmpi"
-I"/Users/shawley/Cactus/arrangements/Bruiser/BruiserConstraints/src"
-I"/Users/shawley/Cactus/arrangements/Bruiser/BruiserConstraints/src/includ
e"
-I"/Users/shawley/Cactus/configs/bruiser/bindings/include/BruiserConstraint
s" -DCCODE
/Users/shawley/Cactus/configs/bruiser/build/BruiserConstraints/BruiserUtil.
cc: In function 'void BruiserF2CIBFillVar(cGH*, int, int, int, int,
maskcodes_type)':
/Users/shawley/Cactus/configs/bruiser/build/BruiserConstraints/BruiserUtil.
cc:461:30: error: expected '(' before 'Cactus'
make[3]: *** [BruiserUtil.cc.o] Error 1
make[2]: *** [make.checked] Error 2

Pulling the raw code itself shows no lines with "Cactus" in them, so
apparently "isnan" has NOT been redefined by some header:
% sed -n 460,462p
/Users/shawley/Cactus/configs/bruiser/build/BruiserConstraints/BruiserUtil.
cc
#ifdef HAVE_ISNAN
if isnan(6.0) {}
#endif
%

I'm guessing this is one of those cases where the error being reported is
not the "real" error. So I checked to make sure parentheses and curly
braces are opened & closed appropriately.

Any suggestions for how to fix this?
Thanks.

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--
Erik Schnetter <schnetter@cct.lsu.edu>
http://www.perimeterinstitute.ca/personal/eschnetter/