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...sitate that SafeStack be applied so extensively, since otherwise memory operands in a library that refer to an incorrect segment may cause crashes. I will propose storing the unsafe stack pointer in the thread control block in musl libc, so I added support for that to LLVM (http://reviews.llvm.org/D19762). Some of the functions in these libraries may need to be invoked both before and after threading has been initialized, so I added support for compiling functions to dynamically handle both modes by dynamically checking whether a single-threaded unsafe stack pointer should be used (http://reviews....