jcs.org
jcs's openbsd hax
openbsd
Mark the invalid memory location as volatile, otherwise clang would optimize the access to it with an illegal instruction. But the tests needs a SIGSEGV, it would fail with SIGILL.
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regress/lib/libc/setjmp-signal/setjmp-signal.c
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regress/lib/libc/setjmp-signal/setjmp-signal.c
···
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/* $OpenBSD: setjmp-signal.c,v 1.3 2003/01/03 20:46:05 miod Exp $ */
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/* $OpenBSD: setjmp-signal.c,v 1.4 2017/07/27 12:31:09 bluhm Exp $ */
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/*
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* Written by Artur Grabowski <art@openbsd.org> 2002 Public Domain.
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*/
···
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{
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signal(SIGSEGV, segv_handler);
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if (setjmp(jb) == 0) {
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*((int *)0L) = 0;
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*((volatile int *)0L) = 0;
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return (1);
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}
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return (0);