GN (Android): Make is_clang work for (at least for arm32)

build/toolchain/android/BUILD.gn

Index: build/toolchain/android/BUILD.gn
diff --git a/build/toolchain/android/BUILD.gn b/build/toolchain/android/BUILD.gn
index 087f04b3506331bd1d6c631f49074f03ffea449e..867fa4897a51c1bdc464e5b704ab74a74ce1b97b 100644
--- a/build/toolchain/android/BUILD.gn
+++ b/build/toolchain/android/BUILD.gn
@@ -45,8 +45,21 @@ template("android_gcc_toolchain") {
       compiler_prefix = ""
     }
 
-    cc = compiler_prefix + tool_prefix + "gcc"
-    cxx = compiler_prefix + tool_prefix + "g++"
+    is_clang = invoker.is_clang
+    if (is_clang) {
+      if (use_clang_type_profiler) {
+        prefix = rebase_path("//third_party/llvm-allocated-type/Linux_x64/bin",
+                             root_build_dir)
+      } else {
+        prefix = rebase_path("//third_party/llvm-build/Release+Asserts/bin",
+                             root_build_dir)
+      }
+      cc = "${compiler_prefix}$prefix/clang"
+      cxx = "${compiler_prefix}$prefix/clang++"
+    } else {
+      cc = "${compiler_prefix}${tool_prefix}gcc"
+      cxx = "${compiler_prefix}${tool_prefix}g++"
+    }
     ar = tool_prefix + "ar"
     ld = cxx
     readelf = compiler_prefix + tool_prefix + "readelf"
@@ -80,7 +93,24 @@ template("android_gcc_toolchain") {
   }
 }
 
-android_gcc_toolchain("x86") {
+template("android_gcc_toolchains_helper") {
+  android_gcc_toolchain(target_name) {
+    android_ndk_sysroot = invoker.android_ndk_sysroot
+    android_ndk_lib_dir = invoker.android_ndk_lib_dir
+    tool_prefix = invoker.tool_prefix
+    toolchain_cpu = invoker.toolchain_cpu
+  }
+
+  android_gcc_toolchain("clang_$target_name") {
+    android_ndk_sysroot = invoker.android_ndk_sysroot
+    android_ndk_lib_dir = invoker.android_ndk_lib_dir
+    tool_prefix = invoker.tool_prefix
+    toolchain_cpu = invoker.toolchain_cpu
+    is_clang = true
+  }
+}
+
+android_gcc_toolchains_helper("x86") {
   android_ndk_sysroot = "$android_ndk_root/$x86_android_sysroot_subdir"
   android_ndk_lib_dir = "usr/lib"
 
@@ -88,7 +118,7 @@ android_gcc_toolchain("x86") {
   toolchain_cpu = "x86"
 }
 
-android_gcc_toolchain("arm") {
+android_gcc_toolchains_helper("arm") {
   android_ndk_sysroot = "$android_ndk_root/$arm_android_sysroot_subdir"
   android_ndk_lib_dir = "usr/lib"
 
@@ -96,7 +126,7 @@ android_gcc_toolchain("arm") {
   toolchain_cpu = "arm"
 }
 
-android_gcc_toolchain("mipsel") {
+android_gcc_toolchains_helper("mipsel") {
   android_ndk_sysroot = "$android_ndk_root/$mips_android_sysroot_subdir"
   android_ndk_lib_dir = "usr/lib"
 
@@ -104,7 +134,7 @@ android_gcc_toolchain("mipsel") {
   toolchain_cpu = "mipsel"
 }
 
-android_gcc_toolchain("x64") {
+android_gcc_toolchains_helper("x64") {
   android_ndk_sysroot = "$android_ndk_root/$x86_64_android_sysroot_subdir"
   android_ndk_lib_dir = "usr/lib64"
 
@@ -112,7 +142,7 @@ android_gcc_toolchain("x64") {
   toolchain_cpu = "x86_64"
 }
 
-android_gcc_toolchain("arm64") {
+android_gcc_toolchains_helper("arm64") {
   android_ndk_sysroot = "$android_ndk_root/$arm64_android_sysroot_subdir"
   android_ndk_lib_dir = "usr/lib"
 
@@ -120,7 +150,7 @@ android_gcc_toolchain("arm64") {
   toolchain_cpu = "aarch64"
 }
 
-android_gcc_toolchain("mips64el") {
+android_gcc_toolchains_helper("mips64el") {
   android_ndk_sysroot = "$android_ndk_root/$mips64_android_sysroot_subdir"
   android_ndk_lib_dir = "usr/lib64"