Another shot at fixing the issues with (constant) struct literals and their addresses. See DMD2682, #218, #324. The idea is to separate the notion of const from 'this variable can always be replaced with its initializer' in the frontend. To do that, I introduced Declaration::isSameAsInitializer, which is overridden in VarDeclaration to return false for constants that have a struct literal initializer. So {{{ const S s = S(5); void foo() { auto ps = &s; } // is no longer replaced by void foo() { auto ps = &(S(5)); } }}} To make taking the address of a struct constant with a struct-initializer outside of function scope possible, I made sure that AddrExp::optimize doesn't try to run the argument's optimization with WANTinterpret - that'd again replace the constant with a struct literal temporary.

This should help get the runtime built.
FOR D1:
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1) Do a checkout of tango trunk into the ldc root dir (along dmd, gen, runtime etc).

    *   $ ls
    *   dmd dmd2 gen ir ...
    *   $ svn co http://svn.dsource.org/projects/tango/trunk tango

2) Compile the runtime

    *   sh build.sh

FOR D2:
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Highly experimental!!!

1) Do a checkout of druntime trunk into the ldc root dir (along dmd, gen, runtime etc).

    *   $ ls
    *   dmd dmd2 gen ir ...
    *   $ svn co http://svn.dsource.org/projects/druntime/trunk druntime

2) Patch druntime

    *   cd runtime
    *   sh patch-druntime.sh

3) Compile druntime

    *   cd ../druntime/src
    *   sh build-ldc.sh

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Enjoy!