Index: compiler-rt/test/asan/TestCases/Linux/dlopen-mixed-c-cxx.c
===================================================================
--- compiler-rt/test/asan/TestCases/Linux/dlopen-mixed-c-cxx.c
+++ compiler-rt/test/asan/TestCases/Linux/dlopen-mixed-c-cxx.c
@@ -28,9 +28,18 @@
 
 #else
 
+#define _GNU_SOURCE
 #include <assert.h>
 #include <dlfcn.h>
 
+// Wrap __cxa_throw to make sure it's defined in the main executable.
+typedef void (*cxa_throw_t)(void *, void *, void (*)(void *));
+void __cxa_throw(void *thrown_exception, void *tinfo,
+                 void (*dest)(void *)) {
+  cxa_throw_t real = dlsym(RTLD_NEXT, "__cxa_throw");
+  real(thrown_exception, tinfo, dest);
+}
+
 int main(int argc, char **argv) {
   int (*bar)(void);
   void *handle = dlopen(argv[1], RTLD_LAZY);