GN: mac host and armv7 target

gn/BUILD.gn

 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 declare_args() {
+  ar = "ar"
   cc = "cc"
   cxx = "c++"
 
   if (is_android) {
+    ar = "$ndk/toolchains/$ndk_gccdir-4.9/prebuilt/$ndk_host/$ndk_target/bin/ar"
     cc = "$ndk/toolchains/llvm/prebuilt/$ndk_host/bin/clang"
     cxx = "$ndk/toolchains/llvm/prebuilt/$ndk_host/bin/clang++"
   }
 
   extra_cflags = ""
   extra_cflags_c = ""
   extra_cflags_cc = ""
 }
 
 config("no_rtti") {
@@ skipping 20 matching lines @@
   ]
   cflags_cc = [
     "-std=c++11",
     "-fno-exceptions",
     "-fno-threadsafe-statics",
     "-fvisibility-inlines-hidden",
 
     "-Wnon-virtual-dtor",
   ]
   if (current_cpu == "arm") {
-    cflags += [ "-mfpu=neon" ]
+    cflags += [
+      "-march=armv7-a",
+      "-mfpu=neon",
+      "-mthumb",
+    ]
+  } else if (current_cpu == "mipsel") {
+    cflags += [
+      "-march=mips32r2",
+      "-mdspr2",
+    ]
   }
 
   if (is_android) {
-    asmflags = [ "--target=$ndk_target" ]
+    asmflags = [
+      "--target=$ndk_target",
+      "-B$ndk/toolchains/$ndk_gccdir-4.9/prebuilt/$ndk_host/$ndk_target/bin",
+    ]
     cflags += [
       "--sysroot=$ndk/platforms/$ndk_platform",
       "--target=$ndk_target",
+      "-B$ndk/toolchains/$ndk_gccdir-4.9/prebuilt/$ndk_host/$ndk_target/bin",
     ]
     cflags_cc += [
       "-isystem$ndk/sources/android/support/include",
       "-isystem$ndk/sources/cxx-stl/llvm-libc++/libcxx/include",
     ]
     ldflags = [
       "--sysroot=$ndk/platforms/$ndk_platform",
       "--target=$ndk_target",
-      "-B$ndk/toolchains/$ndk_target-4.9/prebuilt/$ndk_host/$ndk_target/bin",
+      "-B$ndk/toolchains/$ndk_gccdir-4.9/prebuilt/$ndk_host/$ndk_target/bin",
       "-pie",
     ]
     lib_dirs = [
       "$ndk/sources/cxx-stl/llvm-libc++/libs/$ndk_stdlib",
-      "$ndk/toolchains/$ndk_target-4.9/prebuilt/$ndk_host/lib/gcc/$ndk_target/4.9.x",
+      "$ndk/toolchains/$ndk_gccdir-4.9/prebuilt/$ndk_host/lib/gcc/$ndk_target/4.9.x",
     ]
     libs = [
       # Order matters here!  Keep these three in exactly this order.
       "c++_static",
       "c++abi",
       "android_support",
     ]
+    if (target_cpu == "arm") {
+      libs += [ "unwind" ]
+    }
   }
 
   if (is_linux) {
     libs = [ "pthread" ]
   }
 }
 
 config("release") {
   cflags = [ "-Os" ]
   defines = [ "NDEBUG" ]
@@ skipping 39 matching lines @@
     depfile = "{{output}}.d"
     command = "$cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{asmflags}} -c {{source}} -o {{output}}"
     depsformat = "gcc"
     outputs = [
       "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
     ]
     description = "$cc ... -o {{output}}"
   }
 
   tool("alink") {
-    command = "rm -f {{output}} && ar rcs {{output}} {{inputs}}"
+    command = "rm -f {{output}} && $ar rcs {{output}} {{inputs}}"
     outputs = [
       "{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
     ]
     default_output_extension = ".a"
     output_prefix = "lib"
-    description = "ar {{output}} ..."
+    description = "$ar {{output}} ..."
   }
 
   tool("solink") {
     soname = "{{target_output_name}}{{output_extension}}"
 
     rpath = "-Wl,-soname,$soname"
     if (is_mac) {
       rpath = "-Wl,-install_name,@rpath/$soname"
     }
 
@@ skipping 17 matching lines @@
   }
 
   tool("stamp") {
     command = "touch {{output}}"
   }
 
   tool("copy") {
     command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}} && cp -af {{source}} {{output}})"
   }
 }