PPC detected as little endian (!)

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Hello,

after seeing ocamlnet 3.6 fail spectacularly on a Power Mac, I tried
recompiling and watching closely the configuration options. Lo and behold,
configure proudly proclaims:

Checking endianess... little

which is of course completely wrong. The problem is that pointer aliasing
via unions is undefined behavior in C (barring packing pragmas and other
compiler wizardry), and GCC/LLVM do whatever they want with that code. I've
found that I can distinguish endianness reliably with the following check:

value check(value d) {
  int i =3D 1;
  char *s =3D (char*) &i;
  return (s[0] =3D=3D 0 ? Val_true : Val_false);
}

Regards,
Mat=C3=ADas.

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Hello,<div><br></div><div>after seeing ocamlnet 3.6 fail spectacularly on a=
 Power Mac, I tried recompiling and watching closely the configuration opti=
ons. Lo and behold, configure proudly proclaims:</div><div><br></div><div>
<div>Checking endianess... little</div></div><div><br></div><div>which is o=
f course completely wrong. The problem is that pointer aliasing via unions =
is undefined behavior in C (barring packing pragmas and other compiler wiza=
rdry), and GCC/LLVM do whatever they want with that code. I&#39;ve found th=
at I can distinguish endianness reliably with the following check:</div>
<div><br></div><div><div>value check(value d) {</div><div>=C2=A0 int i =3D =
1;</div><div>=C2=A0 char *s =3D (char*) &amp;i;</div><div>=C2=A0 return (s[=
0] =3D=3D 0 ? Val_true : Val_false);</div><div>}</div></div><div><br></div>=
<div>Regards,</div>
<div>Mat=C3=ADas.</div>

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