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...the jmpbuf with a function pointer to a longjmp call that is compiled in the same compilation unit as the setjmp. ZZ_SIGLONGJMP calls through this function pointer. This way, an llvm-compiled longjmp is used for every longjmp to an llvm-compiled setjmp; and a gcc-compiled longjmp is used for every longmp to a gcc-compiled setjmp. C++ exceptions or destructors wouldn't be handled properly, but that doesn't matter in this application because it is all in C. Note also that it is necessary to invoke llc with the --enable-correct-eh-support flag to enable setjmp/longjmp. Regards, ... kurt /*...