On 8/29/2020 1:57 PM, Ken Brown via Cygwin wrote:
>> #include <math.h>
>> #include <stdio.h>
>> #include <stdlib.h>
>>
>> int main(int argc, char *argv[]) {
>> long double a, b, c;
>> char *num_end = NULL;
>> a = b = c = 0.0L;
>> if (argc != 2) {
>> fprintf(stderr, "Usage: %s NUMBER\n", argv[0]);
>> exit(1);
>> }
>> a = strtold(argv[1], &num_end);
>> b = modfl(a, &c);
>> printf("%Lf %Lf %Lf\n", a, b, c);
>> return 0;
>> }
I'm using gcc 9.3, and this dies in modfl where it is trying to store the result back. The -O level
does not seem to matter. modfl seems seriously broken. It comes from winsup in
base cygwin. I was running 3.1.6-1. I upgraded to 3.1.7-1 and got the same
thing. This
is the 64-bit cygwin.
The 32-bit version of cygwin 3.1.6-1 processes and runs this just fine. Same
version
of gcc.
It seems the math functions in winsup were not built quite right ...
Regards - Eliot Moss
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