Implement first D-specific optimization pass: -simplify-drtcalls. It uses the machinery of the standard -simplify-libcalls pass, but optimizes calls to the D runtime instead of calls to C libraries. At the moment, these optimizations are implemented by this pass: - Avoid the runtime call for `arr.length = newlen` if it can determine that the new length isn't longer than the old one. - Ditto for `cast(T[]) arr` if it will clearly always succeed. (e.g. if the length of the original array is zero, or if the old element size is a multiple of the new element size)

// This configuration file uses libconfig.
// See http://www.hyperrealm.com/libconfig/ for syntax details.

// The default group is required
default:
{
    // 'switches' holds array of string that are appends to the command line
    // arguments before they are parsed.
    switches = [
        "-I@RUNTIME_DIR@/import",
        "-L-L@PROJECT_BINARY_DIR@/../lib",
        "-defaultlib=@RUNTIME_AIO@",
        "-debuglib=@RUNTIME_AIO@"
    ];
};