make sure undefine references in dlopen()-ed libs are handled graciously

test/dlopen/Makefile

@@ -4,7 +4,7 @@
 # rules need a little love to work with glibc ...
 export UCLIBC_ONLY := 1
 
-TESTS := dltest dltest2 dlstatic test1 test2 test3 dlundef
+TESTS := dltest dltest2 dlstatic test1 test2 test3 dlundef dlafk
 
 include ../Test.mak
 
@@ -15,6 +15,7 @@ LDFLAGS_dlstatic := -ldl
 LDFLAGS_dltest   := -ldl -lpthread
 LDFLAGS_dltest2  := -ldl -lpthread
 LDFLAGS_dlundef  := -ldl
+LDFLAGS_dlafk    := -ldl ./libafk.so -Wl,-rpath,.
 LDFLAGS_test1    := -ldl
 LDFLAGS_test2    := -ldl
 LDFLAGS_test3    := -ldl ./libtest1.so ./libtest2.so -Wl,-rpath,.
@@ -26,6 +27,9 @@ dltest: libtest.so
 dltest2: libtest3.so
 dlstatic: libstatic.so
 dlundef: libundef.so
+dlafk: libafk.so
+libafk.so: libafk-temp.so
+LDFLAGS_libafk.so := ./libafk-temp.so -Wl,-rpath,.
 test1: libtest1.so
 test2: libtest1.so libtest2.so
 test3: libtest1.so libtest2.so

test/dlopen/dlafk.c

@@ -0,0 +1,36 @@
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <dlfcn.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+#define LIBNAME "libafk.so"
+
+#define LIBAFK "libafk-temp.so"
+#define LIBAFK_BAK ".libafk-temp.so.temp"
+
+int main(int argc, char **argv)
+{
+	void *handle;
+
+	if (rename(LIBAFK, LIBAFK_BAK)) {
+		fprintf(stderr, "Unable to rename %s: %s\n", LIBAFK, strerror(errno));
+		return EXIT_FAILURE;
+	}
+
+	handle = dlopen(LIBNAME, RTLD_NOW);
+	if (!handle) {
+		fprintf(stderr, "Could not open ./%s: %s\n", LIBNAME, dlerror());
+		return EXIT_FAILURE;
+	}
+
+	if (rename(LIBAFK_BAK, LIBAFK)) {
+		fprintf(stderr, "Unable to rename %s: %s\n", LIBAFK_BAK, strerror(errno));
+		return EXIT_FAILURE;
+	}
+
+	return EXIT_SUCCESS;
+}

test/dlopen/libafk-temp.c

@@ -0,0 +1 @@
+/* the actual contents doesnt matter */

test/dlopen/libafk.c

@@ -0,0 +1 @@
+/* the actual contents doesnt matter */

test/dlopen/libundef.c

@@ -1,15 +1 @@
-#include <stdio.h>
-
-static int global_static = -1;
-
-int static_test(void)
-{
-	static int local_static = -2;
-
-	if (global_static != -1)
-		printf("FAIL: global_static is not -1\n");
-	if (local_static != -2)
-		printf("FAIL: local_static is not -2\n");
-
-	return (global_static == -1 && local_static == -2);
-}
+/* the actual contents doesnt matter */