use warnings;

use Inline C => Config =>
    BUILD_NOISY => 1;

use Inline C => <<'EOC';

SV * call_Adder(SV * a, SV * b) {
 dSP;
 I32 ax;
 int count;

 PUSHMARK(SP);
 XPUSHs(a);
 XPUSHs(b);
 PUTBACK;

 count = call_pv("Adder", G_SCALAR);

 SPAGAIN;
 SP -= count;
 ax = (SP - PL_stack_base) + 1;

 if (count != 1)
   croak("Big trouble\n");

 /* Avoid "Attempt to free unreferenced scalar" warning */
 SvREFCNT_inc(ST(0));

 return ST(0);
}

EOC

my $val = call_Adder(13,118);
print $val, "\n";

my $val2 = call_Adder(14,119);
print $val2, "\n";

my $val3 = call_Adder(14,8);
print $val3, "\n";

sub Adder {
 my($a, $b) = @_;
 $a + $b;
}

__END__
Outputs (as expected):
131
133
22