Gregory Stark <stark@enterprisedb.com> writes:
> "zhuge xiao" <zhuge@Rinaix.cn> writes:
>> I wrote and compiled and linked a C function, add_float, which returns
>> float in C like following:
> float8 and float aren't the same thing. "float" is a C data type which is not
> wide enough to hold a float8. The first line actually works by shortening it
> but the return doesn't work because it returns a pointer to the float and
> claims it's a pointer to the float8.
I don't think that's the problem, because PG_RETURN_FLOAT8 doesn't
actually do that. More likely is confusion between float4 and
float8 in the SQL declaration of the function.
regards, tom lane