diff --git a/Android.mk b/Android.mk
index 9773d5e8..c910e7db 100644
--- a/Android.mk
+++ b/Android.mk
@@ -35,6 +35,7 @@ LOCAL_FORCE_STATIC_EXECUTABLE := true
 RECOVERY_API_VERSION := 3
 RECOVERY_FSTAB_VERSION := 2
 LOCAL_CFLAGS += -DRECOVERY_API_VERSION=$(RECOVERY_API_VERSION)
+LOCAL_CFLAGS += -Wno-unused-parameter
 
 LOCAL_STATIC_LIBRARIES := \
     libext4_utils_static \
@@ -90,6 +91,7 @@ LOCAL_MODULE := verifier_test
 LOCAL_FORCE_STATIC_EXECUTABLE := true
 LOCAL_MODULE_TAGS := tests
 LOCAL_CFLAGS += -DNO_RECOVERY_MOUNT
+LOCAL_CFLAGS += -Wno-unused-parameter
 LOCAL_SRC_FILES := \
     verifier_test.cpp \
     asn1_decoder.cpp \
diff --git a/edify/Android.mk b/edify/Android.mk
index fac0ba71..61ed6fa1 100644
--- a/edify/Android.mk
+++ b/edify/Android.mk
@@ -23,6 +23,7 @@ LOCAL_SRC_FILES := \
 LOCAL_CFLAGS := $(edify_cflags) -g -O0
 LOCAL_MODULE := edify
 LOCAL_YACCFLAGS := -v
+LOCAL_CFLAGS += -Wno-unused-parameter
 
 include $(BUILD_HOST_EXECUTABLE)
 
@@ -34,6 +35,7 @@ include $(CLEAR_VARS)
 LOCAL_SRC_FILES := $(edify_src_files)
 
 LOCAL_CFLAGS := $(edify_cflags)
+LOCAL_CFLAGS += -Wno-unused-parameter
 LOCAL_MODULE := libedify
 
 include $(BUILD_STATIC_LIBRARY)
diff --git a/edify/expr.c b/edify/expr.c
index a2f1f99d..79f6282d 100644
--- a/edify/expr.c
+++ b/edify/expr.c
@@ -287,13 +287,11 @@ Value* LessThanIntFn(const char* name, State* state, int argc, Expr* argv[]) {
 
     long l_int = strtol(left, &end, 10);
     if (left[0] == '\0' || *end != '\0') {
-        printf("[%s] is not an int\n", left);
         goto done;
     }
 
     long r_int = strtol(right, &end, 10);
     if (right[0] == '\0' || *end != '\0') {
-        printf("[%s] is not an int\n", right);
         goto done;
     }
 
diff --git a/edify/expr.h b/edify/expr.h
index 0d8ed8f5..a9ed2f9c 100644
--- a/edify/expr.h
+++ b/edify/expr.h
@@ -164,6 +164,8 @@ Value* StringValue(char* str);
 // Free a Value object.
 void FreeValue(Value* v);
 
+int parse_string(const char* str, Expr** root, int* error_count);
+
 #ifdef __cplusplus
 }  // extern "C"
 #endif
diff --git a/edify/main.c b/edify/main.c
index 9e6bab7c..b3fad53b 100644
--- a/edify/main.c
+++ b/edify/main.c
@@ -30,9 +30,7 @@ int expect(const char* expr_str, const char* expected, int* errors) {
 
     printf(".");
 
-    yy_scan_string(expr_str);
-    int error_count = 0;
-    error = yyparse(&e, &error_count);
+    int error_count = parse_string(expr_str, &e, &error_count);
     if (error > 0 || error_count > 0) {
         printf("error parsing \"%s\" (%d errors)\n",
                expr_str, error_count);
@@ -193,8 +191,7 @@ int main(int argc, char** argv) {
 
     Expr* root;
     int error_count = 0;
-    yy_scan_bytes(buffer, size);
-    int error = yyparse(&root, &error_count);
+    int error = parse_string(buffer, &root, &error_count);
     printf("parse returned %d; %d errors encountered\n", error, error_count);
     if (error == 0 || error_count > 0) {
 
diff --git a/edify/parser.y b/edify/parser.y
index 3f9ade14..f8fb2d12 100644
--- a/edify/parser.y
+++ b/edify/parser.y
@@ -29,6 +29,10 @@ extern int gColumn;
 void yyerror(Expr** root, int* error_count, const char* s);
 int yyparse(Expr** root, int* error_count);
 
+struct yy_buffer_state;
+void yy_switch_to_buffer(struct yy_buffer_state* new_buffer);
+struct yy_buffer_state* yy_scan_string(const char* yystr);
+
 %}
 
 %locations
@@ -128,3 +132,8 @@ void yyerror(Expr** root, int* error_count, const char* s) {
   printf("line %d col %d: %s\n", gLine, gColumn, s);
   ++*error_count;
 }
+
+int parse_string(const char* str, Expr** root, int* error_count) {
+    yy_switch_to_buffer(yy_scan_string(str));
+    return yyparse(root, error_count);
+}
diff --git a/recovery.cpp b/recovery.cpp
index 0a8c3b52..db35f1e9 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -980,7 +980,7 @@ main(int argc, char **argv) {
         load_locale_from_cache();
     }
     printf("locale is [%s]\n", locale);
-    printf("stage is [%s]\n", stage, stage);
+    printf("stage is [%s]\n", stage);
 
     Device* device = make_device();
     ui = device->GetUI();
diff --git a/updater/Android.mk b/updater/Android.mk
index 2e92504c..c21ff8ec 100644
--- a/updater/Android.mk
+++ b/updater/Android.mk
@@ -20,6 +20,7 @@ LOCAL_SRC_FILES := $(updater_src_files)
 
 ifeq ($(TARGET_USERIMAGES_USE_EXT4), true)
 LOCAL_CFLAGS += -DUSE_EXT4
+LOCAL_CFLAGS += -Wno-unused-parameter
 LOCAL_C_INCLUDES += system/extras/ext4_utils
 LOCAL_STATIC_LIBRARIES += \
     libext4_utils_static \
diff --git a/updater/install.c b/updater/install.c
index e85ba50a..ccafad9c 100644
--- a/updater/install.c
+++ b/updater/install.c
@@ -52,7 +52,7 @@
 #endif
 
 // Take a sha-1 digest and return it as a newly-allocated hex string.
-static char* PrintSha1(uint8_t* digest) {
+static char* PrintSha1(const uint8_t* digest) {
     char* buffer = malloc(SHA_DIGEST_SIZE*2 + 1);
     int i;
     const char* alphabet = "0123456789abcdef";
@@ -1115,9 +1115,9 @@ Value* SysPatchFn(const char* name, State* state, int argc, Expr* argv[]) {
         pos += read;
     }
     rewind(src);
-    uint8_t* digest = SHA_final(&ctx);
+    const uint8_t* digest = SHA_final(&ctx);
 
-    char* hexdigest = PrintSha1(digest);
+    const char* hexdigest = PrintSha1(digest);
     printf("  system partition sha1 = %s\n", hexdigest);
 
     if (memcmp(digest, target_digest, SHA_DIGEST_SIZE) == 0) {
diff --git a/updater/updater.c b/updater/updater.c
index 4e1cc9c3..b7af3e50 100644
--- a/updater/updater.c
+++ b/updater/updater.c
@@ -105,8 +105,7 @@ int main(int argc, char** argv) {
 
     Expr* root;
     int error_count = 0;
-    yy_scan_string(script);
-    int error = yyparse(&root, &error_count);
+    int error = parse_string(script, &root, &error_count);
     if (error != 0 || error_count > 0) {
         printf("%d parse errors\n", error_count);
         return 6;