How to make a C function compiled by myself available to `ccall`?

General Usage
29

should the above be @btime str_qsort($svec1) instead? As svec1 gets modified after first run. Also str_qsort should be called str_qsort!. Also on my computer that sort takes 48 seconds but FastGroupBy’s radixsort! only took 19~29 seconds.

const M=100_000_000; const K=100
using FastGroupBy
srand(1)
svec1 = rand([string(rand(Char.(32:126), rand(1:8))...) for k in 1:M÷K], M)
@time FastGroupBy.radixsort!(svec1) # 29 seconds
issorted(svec1)

My cradixsort! performs poorly atm at 39~50 seconds.