diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index e37e226..da1a2e9 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -708,6 +708,9 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
     int l2_size, i, j, l1_modified, l2_modified, nb_csectors, refcount;
     int ret;
 
+    (void)l2_modified;
+    (void)l2_size;
+
     l2_table = NULL;
     l1_table = NULL;
     l1_size2 = l1_size * sizeof(uint64_t);
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 7dfc357..a7019ee 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -892,7 +892,7 @@ static int kvm_get_xsave(CPUState *env)
 #ifdef KVM_CAP_XSAVE
     struct kvm_xsave* xsave;
     int ret, i;
-    uint16_t cwd, swd, twd, fop;
+    uint16_t cwd, swd, twd;
 
     if (!kvm_has_xsave())
         return kvm_get_fpu(env);
@@ -907,7 +907,6 @@ static int kvm_get_xsave(CPUState *env)
     cwd = (uint16_t)xsave->region[0];
     swd = (uint16_t)(xsave->region[0] >> 16);
     twd = (uint16_t)xsave->region[1];
-    fop = (uint16_t)(xsave->region[1] >> 16);
     env->fpstt = (swd >> 11) & 7;
     env->fpus = swd;
     env->fpuc = cwd;
diff --git a/tcg/tcg.c b/tcg/tcg.c
index 5dd6a2c..b4d230b 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -582,6 +582,7 @@ void tcg_gen_callN(TCGContext *s, TCGv_ptr func, unsigned int flags,
     nparam = gen_opparam_ptr++;
 #ifdef TCG_TARGET_I386
     call_type = (flags & TCG_CALL_TYPE_MASK);
+    (void)call_type;
 #endif
     if (ret != TCG_CALL_DUMMY_ARG) {
 #if TCG_TARGET_REG_BITS < 64
diff --git a/ui/sdl.c b/ui/sdl.c
index f599d42..a1458ce 100644
--- a/ui/sdl.c
+++ b/ui/sdl.c
@@ -87,12 +87,6 @@ static void sdl_update(DisplayState *ds, int x, int y, int w, int h)
 
 static void sdl_setdata(DisplayState *ds)
 {
-    SDL_Rect rec;
-    rec.x = 0;
-    rec.y = 0;
-    rec.w = real_screen->w;
-    rec.h = real_screen->h;
-
     if (guest_screen != NULL) SDL_FreeSurface(guest_screen);
 
     guest_screen = SDL_CreateRGBSurfaceFrom(ds_get_data(ds), ds_get_width(ds), ds_get_height(ds),