[MinGW-notify] [ mingw-Bugs-3491001 ] NAN not recognized by strtod()

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Bugs item #3491001, was opened at 2012-02-22 05:56
Message generated for change (Comment added) made by earnie
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Category: mingw runtime
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: mik (michaelkostylev)
Assigned to: Earnie Boyd (earnie)
Summary: NAN not recognized by strtod()

Initial Comment:
Since mingwrt-3.19 strtod() no longer accepts a NAN string as a quiet NaN:

% cat > nan.c << __EOF && gcc -std=c99 nan.c -lm && ./a.exe
#include <math.h>
#include <stdlib.h>
#include <stdio.h>

int main()
{
  printf("strtod(NAN) = %f, nan('') = %f\n", strtod("NAN", NULL), nan(""));
  return 0;
}
__EOF
strtod(NAN) = 0.000000, nan('') = nan

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>Comment By: Earnie Boyd (earnie)
Date: 2012-08-08 13:31

Message:
FYI __strtod() from mingwex now DTRT.  I will resolve an issue with the
header related to this soon.

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Comment By: Earnie Boyd (earnie)
Date: 2012-08-06 07:07

Message:
I can resolve strtod to __strtod() in the headers and while the result is
better it still isn't correct.  Could you or someone else correct the code
in mingwex/gdtoa/strtodnrp.c to DTRT?  Currently it returns an infinity
result instead of a quite NaN result.

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Comment By: Earnie Boyd (earnie)
Date: 2012-06-14 05:18

Message:
I think this has less to do with the mingwrt version than with the GCC
version being used but it is still a bug in mingw runtime none the less.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=102435&aid=3491001&group_id=2435