GN: mac host and armv7 target

gn/BUILDCONFIG.gn

Index: gn/BUILDCONFIG.gn
diff --git a/gn/BUILDCONFIG.gn b/gn/BUILDCONFIG.gn
index 6aa4451e598d6b5714369055df51bf67614b31af..10f3244f55f8376d09464b438989b9b3f231da8c 100644
--- a/gn/BUILDCONFIG.gn
+++ b/gn/BUILDCONFIG.gn
@@ -22,9 +22,16 @@ if (current_os == "") {
   current_os = target_os
 }
 
+is_android = current_os == "android"
+is_fuchsia = current_os == "fuchsia"
+is_ios = current_os == "ios"
+is_linux = current_os == "linux"
+is_mac = current_os == "mac"
+is_win = current_os == "win"
+
 if (target_cpu == "") {
   target_cpu = host_cpu
-  if (ndk != "") {
+  if (is_android) {
     target_cpu = "arm64"
   }
 }
@@ -32,28 +39,49 @@ if (current_cpu == "") {
   current_cpu = target_cpu
 }
 
-is_android = current_os == "android"
-is_fuchsia = current_os == "fuchsia"
-is_ios = current_os == "ios"
-is_linux = current_os == "linux"
-is_mac = current_os == "mac"
-is_win = current_os == "win"
-
-is_posix = !is_win
-
 if (is_android) {
   ndk_host = ""
   ndk_target = ""
   ndk_platform = ""
   ndk_stdlib = ""
+  nkd_gccdir = ""
 
-  if (host_os == "linux" && host_cpu == "x64") {
+  if (host_os == "linux") {
     ndk_host = "linux-x86_64"
+  } else if (host_os == "mac") {
+    ndk_host = "darwin-x86_64"
   }
+
   if (target_cpu == "arm64") {
     ndk_target = "aarch64-linux-android"
     ndk_platform = "android-21/arch-arm64"
     ndk_stdlib = "arm64-v8a"
+    ndk_gccdir = ndk_target
+  } else if (target_cpu == "arm") {
+    ndk_target = "arm-linux-androideabi"
+    ndk_platform = "android-18/arch-arm"
+    ndk_stdlib = "armeabi-v7a"
+    ndk_gccdir = ndk_target
+  } else if (target_cpu == "mips64el") {
+    ndk_target = "mips64el-linux-android"
+    ndk_platform = "android-21/arch-mips64"
+    ndk_stdlib = "mips64"
+    ndk_gccdir = ndk_target
+  } else if (target_cpu == "mipsel") {
+    ndk_target = "mipsel-linux-android"
+    ndk_platform = "android-18/arch-mips"
+    ndk_stdlib = "mips"
+    ndk_gccdir = ndk_target
+  } else if (target_cpu == "x64") {
+    ndk_target = "x86_64-linux-android"
+    ndk_platform = "android-21/arch-x86_64"
+    ndk_stdlib = "x86_64"
+    ndk_gccdir = ndk_stdlib
+  } else if (target_cpu == "x86") {
+    ndk_target = "i686-linux-android"
+    ndk_platform = "android-18/arch-x86"
+    ndk_stdlib = "x86"
+    ndk_gccdir = ndk_stdlib
   }
 }