ANDROID: Use -Wall and more when building libfdt

Build libfdt with the same warnings as the DTC tools. This effectively
starts using -Wno-missing-field-initializers, -Wno-unused-parameter, and
-Wall.

Test: m libfdt
Test: bazel build //:libfdt
Change-Id: I5a2ae1ee86b4613d0aa7a0174d235976d7be45cc

Android.bp

@@ -44,14 +44,21 @@ license {
 }
 
 cc_defaults {
-    name: "dt_defaults",
+    name: "dtc_cflags_defaults",
     cflags: [
         "-Wall",
         "-Werror",
         "-Wno-macro-redefined",
-        "-Wno-sign-compare",
         "-Wno-missing-field-initializers",
+        "-Wno-sign-compare",
         "-Wno-unused-parameter",
+    ],
+}
+
+cc_defaults {
+    name: "dt_defaults",
+    defaults: ["dtc_cflags_defaults"],
+    cflags: [
         "-DNO_YAML"
     ],
 

BUILD.bazel

@@ -1,26 +1,22 @@
+COPTS = [
+    "-Wall",
+    "-Werror",
+    "-Wno-macro-redefined",
+    "-Wno-missing-field-initializers",
+    "-Wno-sign-compare",
+    "-Wno-unused-parameter",
+]
+
 cc_library(
     name = "libfdt",
     srcs = glob([
         "libfdt/*.h",
         "libfdt/*.c",
     ]),
-    copts = [
-        "-Werror",
-        "-Wno-macro-redefined",
-        "-Wno-sign-compare",
-    ],
+    copts = COPTS,
     includes = ["libfdt"],
 )
 
-COPTS = [
-    "-Wall",
-    "-Werror",
-    "-Wno-macro-redefined",
-    "-Wno-sign-compare",
-    "-Wno-missing-field-initializers",
-    "-Wno-unused-parameter",
-]
-
 genrule(
     name = "lexer",
     srcs = [

libfdt/Android.bp

@@ -7,12 +7,7 @@ package {
 cc_library {
     name: "libfdt",
     host_supported: true,
-
-    cflags: [
-        "-Werror",
-        "-Wno-macro-redefined",
-        "-Wno-sign-compare",
-    ],
+    defaults: ["dtc_cflags_defaults"],
     srcs: [
         "fdt.c",
         "fdt_check.c",