Created attachment 910 [details] patch for issues with debug builds of druntime There are a few issues that you might hit when building a debug build of druntime. Sorry, if these issues should be in separate reports, but I did not want to bother everybody with multiple report on these non-urgent changes: 1. The GC invariants in gc.gcx are not thread safe, so I suggest to enable them only with a separate debug identifier or use one of the existing identifiers. 2. _d_arraycopy always prints debug messages, I guess this should also get some debug(PRINTF) condition. 3. _d_framehandler and _d_local_unwind assert with a range violation if they have to unwind more than entry from the handler table. This happens because the struct DHandlerTable uses a place holder array of length 1, but actually expands beyond that. The patch takes a pointer to the array to avoid the range check.
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