New test.

From-SVN: r38533

gcc/testsuite/gcc.c-torture/execute/20001229-1.c

+/* This testcase originally provoked an unaligned access fault on Alpha.
+
+   Since Digital Unix and Linux (and probably others) by default fix
+   these up in the kernel, the failure was not visible unless one 
+   is sitting at the console examining logs.
+
+   So: If we know how, ask the kernel to deliver SIGBUS instead so
+   that the test case visibly fails.  */
+   
+#if defined(__alpha__) && (defined(__linux__) || defined(__osf__))
+#ifdef __linux__
+#include <asm/sysinfo.h>
+#include <asm/unistd.h>
+
+static inline int
+setsysinfo(unsigned long op, void *buffer, unsigned long size,
+           int *start, void *arg, unsigned long flag)
+{
+  syscall(__NR_osf_setsysinfo, op, buffer, size, start, arg, flag);
+}
+
+#else
+#include <sys/sysinfo.h>
+#endif
+   
+static void __attribute__((constructor))
+trap_unaligned(void)
+{
+  unsigned int buf[2];
+  buf[0] = SSIN_UACPROC;
+  buf[1] = UAC_SIGBUS | UAC_NOPRINT;
+  setsysinfo(SSI_NVPAIRS, buf, 1, 0, 0, 0);
+}
+#endif /* alpha */
+
+void foo(char *a, char *b) { }
+
+void showinfo()
+{
+    char uname[33] = "", tty[38] = "/dev/";
+    foo(uname, tty);
+}
+
+int main()
+{
+  showinfo ();
+  exit (0);
+}