If you use -ansi to compile a program that uses the atanh function, the
compiler somehow replaces atanh with a function that just returns 0. I think
the compiler should either put in the correct atanh function or refuses to
link/compile. The following shows how to reproduce the bug:
$ cat > bug.c
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
int main() { printf("atanh(%f) returns %f!\n",.32,atanh(.32)); return 0;}
$ gcc bug.c -o bug.exe -lm && bug.exe
atanh(0.320000) returns 0.331647!
$ gcc -ansi bug.c -o bug.exe -lm && bug.exe
atanh(0.320000) returns 0.000000!
--
Summary: compiling with -ansi puts in broken version of atanh
Product: gcc
Version: 3.3.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: anonymous at mailinator dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27413
