From 1750944332ea4e461383bcf79614b46cdfb047fa Mon Sep 17 00:00:00 2001
From: Colin Cross <ccross@android.com>
Date: Thu, 10 Apr 2014 11:29:05 -0700
Subject: [PATCH] build: use TARGET_SUPPORTS_32_BIT_APPS and
 TARGET_SUPPORTS_64_BIT_APPS

Use TARGET_SUPPORTS_32_BIT_APPS and TARGET_SUPPORTS_64_BIT_APPS to
determine which native libraries to build for an app.  If
both are set, it will use 64-bit unless TARGET_PREFER_32_BIT is set.
If only one is set, it will only build apps that work on that
architecture.  If neither is set it will fall back to only building
32-bit apps.

On existing 32-bit devices neither variable will be set, and the
build system will continue to build 32-bit apps.

Once a device has support for a 64-bit runtime, the same logic
that selects the dual runtimes should set TARGET_SUPPORTS_32_BIT_APPS
and TARGET_SUPPORTS_64_BIT_APPS, and packages will be built for
the preferred arch, or fall back to the non-preferrred arch if
necessary.

For testing, a device may set TARGET_SUPPORTS_64_BIT_APPS without
TARGET_SUPPORTS_32_BIT_APPS to produce only 64-bit apps.

Change-Id: I5b5e23f15602c3cf9bd96791971208a85492c7a3
---
 core/package.mk | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/core/package.mk b/core/package.mk
index 46bf614b2..fe4d0e4df 100644
--- a/core/package.mk
+++ b/core/package.mk
@@ -5,6 +5,39 @@
 
 include $(BUILD_SYSTEM)/multilib.mk
 
+ifeq ($(TARGET_SUPPORTS_32_BIT_APPS)|$(TARGET_SUPPORTS_64_BIT_APPS),true|true)
+  # packages default to building for either architecture,
+  # the preferred if its supported, otherwise the non-preferred.
+else ifeq ($(TARGET_SUPPORTS_64_BIT_APPS),true)
+  # only 64-bit apps supported
+  ifeq ($(filter $(my_module_multilib),64 both first),$(my_module_multilib))
+    # if my_module_multilib was 64, both, first, or unset, build for 64-bit
+    my_module_multilib := 64
+  else
+    # otherwise don't build this app
+    my_module_multilib := none
+  endif
+else
+  # only 32-bit apps supported
+  ifeq ($(filter $(my_module_multilib),32 both),$(my_module_multilib))
+    # if my_module_multilib was 32, both, or unset, build for 32-bit
+    my_module_multilib := 32
+  else ifeq ($(my_module_multilib),first)
+    ifndef TARGET_IS_64_BIT
+      # if my_module_multilib was first and this is a 32-bit build, build for
+      # 32-bit
+      my_module_multilib := 32
+    else
+      # if my_module_multilib was first and this is a 64-bit build, don't build
+      # this app
+      my_module_multilib := none
+    endif
+  else
+    # my_module_mulitlib was 64 or none, don't build this app
+    my_module_multilib := none
+  endif
+endif
+
 LOCAL_NO_2ND_ARCH_MODULE_SUFFIX := true
 
 # if TARGET_PREFER_32_BIT is set, try to build 32-bit first