[Mono-dev] MONO_ARCH_EXPLICIT_NULL_CHECKS

[calvin at cmpct.info]

Heads up for the S390X people on the list: (and anyone attempting to port Mono to similar platforms) I’ve heard S390X Linux has a ‘null page’ that allows reading from NULL; circumventing the runtime’s signal handler to detect such things. I know AIX also has it, which is why I got MONO_ARCH_EXPLICIT_NULL_CHECKS added to master. Since I don’t have access to S390X to verify; if you run into issues with things that dereference null *and* are resolved with MONO_DEBUG=’explicit-null-checks’, then you should probably add said define to the architecture-specific headers for the JIT.
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