diff --git a/tests/tcg/multiarch/float_helpers.c b/tests/tcg/multiarch/float_helpers.c
index 8ee7903c78..bc530e5732 100644
--- a/tests/tcg/multiarch/float_helpers.c
+++ b/tests/tcg/multiarch/float_helpers.c
@@ -79,11 +79,9 @@ char *fmt_16(uint16_t num)
 
 #ifndef SNANF
 /* Signaling NaN macros, if supported.  */
-# if __GNUC_PREREQ(3, 3)
 #  define SNANF (__builtin_nansf (""))
 #  define SNAN (__builtin_nans (""))
 #  define SNANL (__builtin_nansl (""))
-# endif
 #endif
 
 static float f32_numbers[] = {
diff --git a/tests/tcg/multiarch/linux-test.c b/tests/tcg/multiarch/linux-test.c
index 673d7c8a1c..8a7c15cd31 100644
--- a/tests/tcg/multiarch/linux-test.c
+++ b/tests/tcg/multiarch/linux-test.c
@@ -485,7 +485,11 @@ static void test_signal(void)
     act.sa_flags = SA_SIGINFO;
     chk_error(sigaction(SIGSEGV, &act, NULL));
     if (setjmp(jmp_env) == 0) {
-        *(uint8_t *)0 = 0;
+        /*
+         * clang requires volatile or it will turn this into a
+         * call to abort() instead of forcing a SIGSEGV.
+         */
+        *(volatile uint8_t *)0 = 0;
     }
 
     act.sa_handler = SIG_DFL;