Vincent Lefevre schrieb:
Following PR80756 (which is currently about missing diagnostics, but
the problem may be more important), what should be the result of the
following code?
double fabs (double x)
{
return x + 1.0;
}
int main (void)
{
double x = fabs (2.0);
return x != 3.0;
}
Note that <math.h> is not included. When -fno-builtin-fabs is used,
the program returns 0 (because x == 3.0). But by default, a builtin
is used, and the program returns 1. Since <math.h> is not included,
I don't think this is correct. But Clang has the same behavior.
Note that neither give any warning, even with -Wall -Wextra.
