Allow specific optimization passes to be requested from the command line. Now you can run "`ldc test.d -c -mem2reg -simplifycfg`" if you feel the urge. The -O<N> options are still supported, and are inserted in the passes list in the position where they appear on the command line. (so -simplifycfg -O1 -instcombine does the "right thing") One small change: -inline is renamed to -enable-inlining due to a naming conflict with the option to add the -inline pass. -inline now inserts the inlining pass in the position specified, not in the middle of -O<N>. (ldmd has been updated to translate -inline to -enable-inlining)

module constructors;

import tango.io.Console;

class C
{
    this()
    {
        Cout("C()").newline;
    }
    this(char[] str)
    {
        Cout("C(")(str)(")").newline;
    }
}

class D : C
{
    this()
    {
        super("D");
        Cout("D()").newline;
    }
}

void main()
{
    auto c1 = new C();
    auto c2 = new C("C");
    auto d = new D();
}