libstdc++/2311: isnan(), isinf(), etc, not undefined
Sat Mar 17 08:46:00 GMT 2001

>Number:         2311
>Category:       libstdc++
>Synopsis:       isnan(), isinf(), etc, not undefined
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 17 08:46:01 PST 2001
>Originator:     Paolo Carlini
>Release:        3.1 20010314 (experimental) and Codesourcery online test
Glibc2.2.2, Linux2.2.18, i686
The following code snippet:

#include <cmath>
void isnan (int a, int b) { } 

does not compile. On the other hand, the following does:

#include <cmath>
void cos (int a, int b) { }
Due to this behavior, the current blitz snapshot (blitz-20001213) cannot be compiled.
I believe that a few more macros defined in <math.h> (in particular those concerning the floating point categories), should be undefined at the beginning of std_cmath.h.
Indeed, adding and #undef isnan line in std_cmath.h leads to a successful compilation of the testcase above; the blitz library also compiles.
(however, for apparently unrelated reasons, the make check stops due to an ICE during the compilation of the extract.cpp testcase)


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