I have been attempting to use the gamma functions
in libm. The following program does not compile:
/*** test1.c ****/
#include <stdlib.h>
#include <math.h>
int main(void)
{
signgam = 0;
exit(0);
}
gcc test1.c -lm
$ gcc test1.c -lm
/c/TEMP/ccQLwcGF.o(.text+0xd):test1.c: undefined reference to `signgam'
collect2: ld returned 1 exit status
Signgam is a global variable required for
the gamma functions. In the cygwin math.h:
$ grep signgam math.h
math.h:/* The gamma functions use a global variable, signgam. */
math.h:extern int signgam;
It must be missing from libm.
This program compiles without difficulty with gcc under Solaris.
Thanks,
Charles
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