newlib: add qa test for setjmp/longjmp

qa/lib/newlib/031-setjmp.c

@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <setjmp.h>
+
+/* declare variable of type jmp_buf */
+jmp_buf resume_here;
+
+void hello(void);
+
+int main(void)
+{
+	int ret_val;
+	printf("sizeof(jmp_buf) = %lu\n", sizeof(jmp_buf));
+
+	/* Initialize 'resume_here' by calling setjmp() */
+	if (ret_val = setjmp(resume_here)) {
+		printf("After \'longjump()\', back in \'main()\'\n");
+		printf("\'jump buffer variable \'resume_here\'\' becomes "
+			  "INVALID!\n");
+		return 0;
+	} else {
+		printf("\'setjmp()\' returns first time\n");
+		hello();
+		return 1;
+	}
+}
+
+void hello(void)
+{
+	printf("Hey, I'm in \'hello()\'\n");
+	longjmp(resume_here, 1);
+
+	/* other code */
+	printf("can't be reached here because I did longjmp!\n");
+}

qa/lib/newlib/build.json

@@ -35,6 +35,7 @@
 			"010-fork.c",
 			"020-waitpid.c",
 			"030-pause.c",
+			"031-setjmp.c",
 			"040-gettimeofday.c",
 			"100-files.c",
 			"101-files.c",