C interoperability, combinations of library and OS versions

Using Swift
,
4

Meanwhile, another silly workaround you may not have thought of: function pointers:

#if CUSTOM_SQLITE_BUILD
func f1() {
  f1Impl(sqlite_foo) // the custom one
}
#else
@available(…)
func f1() {
  f1Impl(sqlite_foo) // the Apple one
}
#endif

private func f1Impl(_ sqlite_foo: @convention(c) (UnsafePointer<CChar>) -> Void) {
  sqlite_foo(🐵)
}

This has its own set of drawbacks, of course, but it can sometimes cut down on code duplication, and the extra function should get optimized away.

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