From 94d16e5a0fb7552d56dc548c6ebaa27729a9a2e6 Mon Sep 17 00:00:00 2001
From: David 'Digit' Turner <digit@google.com>
Date: Mon, 5 May 2014 16:13:50 +0200
Subject: [PATCH 1/2] envsetup.sh: Use prebuilt emulator binaries if available.

This patch changes the setpaths() function in envsetup.sh to probe
for prebuilts/android-emulator/<host>/, and prepend it to PATH if
it exists.

See https://android-review.googlesource.com/#/c/93399/
for a related patch that adds the binaries.

BUG=13747402

Change-Id: I30794ea52f6dfc58908e6271f2c0da8e2f0b68e8
---
 envsetup.sh | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/envsetup.sh b/envsetup.sh
index 60726d3350..d02646630a 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -171,6 +171,25 @@ function setpaths()
     export ANDROID_QTOOLS=$T/development/emulator/qtools
     export ANDROID_DEV_SCRIPTS=$T/development/scripts:$T/prebuilts/devtools/tools
     export ANDROID_BUILD_PATHS=$(get_build_var ANDROID_BUILD_PATHS):$ANDROID_QTOOLS:$ANDROID_TOOLCHAIN:$ANDROID_KERNEL_TOOLCHAIN_PATH$ANDROID_DEV_SCRIPTS:
+
+    # If prebuilts/android-emulator/<system>/ exists, prepend it to our PATH
+    # to ensure that the corresponding 'emulator' binaries are used.
+    case $(uname -s) in
+        Darwin)
+            ANDROID_EMULATOR_PREBUILTS=$T/prebuilts/android-emulator/darwin-x86_64
+            ;;
+        Linux)
+            ANDROID_EMULATOR_PREBUILTS=$T/prebuilts/android-emulator/linux-x86_64
+            ;;
+        *)
+            ANDROID_EMULATOR_PREBUILTS=
+            ;;
+    esac
+    if [ -n "$ANDROID_EMULATOR_PREBUILTS" -a -d "$ANDROID_EMULATOR_PREBUILTS" ]; then
+        ANDROID_BUILD_PATHS=$ANDROID_EMULATOR_PREBUILTS:$ANDROID_BUILD_PATHS
+        export ANDROID_EMULATOR_PREBUILTS
+    fi
+
     export PATH=$ANDROID_BUILD_PATHS$PATH
 
     unset ANDROID_JAVA_TOOLCHAIN

From f6e2694dd24d54a93d3c9adb633e0776cedb1049 Mon Sep 17 00:00:00 2001
From: David 'Digit' Turner <digit@google.com>
Date: Fri, 9 May 2014 15:19:45 +0200
Subject: [PATCH 2/2] Disable emulator from platform builds.

Now that emulator prebuilts are available under prebuilts/android-emulator/,
disable building the emulator from source in all platform builds, except
if one defines BUILD_EMULATOR to 'true' in its environment.

NOTE: This patch should be applied after this one to avoid issues
      with the GPU emulation libraries:
            https://android-review.googlesource.com/93980

Change-Id: I53b2ada9ca0c2e159dccee7cdca7f55f6b0d1d42
---
 core/main.mk                              | 16 +---------------
 target/board/generic_arm64/BoardConfig.mk |  1 -
 2 files changed, 1 insertion(+), 16 deletions(-)

diff --git a/core/main.mk b/core/main.mk
index 8f60da751a..e7a97be444 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -228,22 +228,8 @@ endif
 
 
 ifndef BUILD_EMULATOR
-ifeq (darwin,$(HOST_OS))
-GCC_REALPATH = $(realpath $(shell which $(HOST_CC)))
-ifneq ($(findstring llvm-gcc,$(GCC_REALPATH)),)
-  # Using LLVM GCC results in a non functional emulator due to it
-  # not honouring global register variables
-  $(warning ****************************************)
-  $(warning * gcc is linked to llvm-gcc which will *)
-  $(warning * not create a useable emulator.       *)
-  $(warning ****************************************)
+  # Emulator binaries are now provided under prebuilts/android-emulator/
   BUILD_EMULATOR := false
-else
-  BUILD_EMULATOR := true
-endif
-else   # HOST_OS is not darwin
-  BUILD_EMULATOR := true
-endif  # HOST_OS is darwin
 endif
 
 $(shell echo 'VERSIONS_CHECKED := $(VERSION_CHECK_SEQUENCE_NUMBER)' \
diff --git a/target/board/generic_arm64/BoardConfig.mk b/target/board/generic_arm64/BoardConfig.mk
index 1768ffc9b6..9d3bcc035c 100644
--- a/target/board/generic_arm64/BoardConfig.mk
+++ b/target/board/generic_arm64/BoardConfig.mk
@@ -55,4 +55,3 @@ BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE := ext4
 BOARD_FLASH_BLOCK_SIZE := 512
 TARGET_USERIMAGES_SPARSE_EXT_DISABLED := true
 
-BUILD_EMULATOR := false