Merge pull request #728 from taka-no-me:ndk-r8e

android/android.toolchain.cmake

 # Copyright (c) 2010-2011, Ethan Rublee
-# Copyright (c) 2011-2012, Andrey Kamaev
+# Copyright (c) 2011-2013, Andrey Kamaev
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
@@ -281,8 +281,14 @@
 #     [+] updated for NDK r8c
 #     [+] added support for clang compiler
 #   - December 2012
+#     [+] suppress warning about unused CMAKE_TOOLCHAIN_FILE variable
+#     [+] adjust API level to closest compatible as NDK does
 #     [~] fixed ccache full path search
 #     [+] updated for NDK r8d
+#     [~] compiler options are aligned with NDK r8d
+#   - March 2013
+#     [+] updated for NDK r8e (x86 version)
+#     [+] support x86_64 version of NDK
 # ------------------------------------------------------------------------------
 
 cmake_minimum_required( VERSION 2.6.3 )
@@ -292,6 +298,10 @@ if( DEFINED CMAKE_CROSSCOMPILING )
  return()
 endif()
 
+if( CMAKE_TOOLCHAIN_FILE )
+ # touch toolchain variable only to suppress "unused variable" warning
+endif()
+
 get_property( _CMAKE_IN_TRY_COMPILE GLOBAL PROPERTY IN_TRY_COMPILE )
 if( _CMAKE_IN_TRY_COMPILE )
  include( "${CMAKE_CURRENT_SOURCE_DIR}/../android.toolchain.config.cmake" OPTIONAL )
@@ -305,7 +315,7 @@ set( CMAKE_SYSTEM_VERSION 1 )
 # rpath makes low sence for Android
 set( CMAKE_SKIP_RPATH TRUE CACHE BOOL "If set, runtime paths are not added when using shared libraries." )
 
-set( ANDROID_SUPPORTED_NDK_VERSIONS ${ANDROID_EXTRA_NDK_VERSIONS} -r8d -r8c -r8b -r8 -r7c -r7b -r7 -r6b -r6 -r5c -r5b -r5 "" )
+set( ANDROID_SUPPORTED_NDK_VERSIONS ${ANDROID_EXTRA_NDK_VERSIONS} -r8e -r8d -r8c -r8b -r8 -r7c -r7b -r7 -r6b -r6 -r5c -r5b -r5 "" )
 if(NOT DEFINED ANDROID_NDK_SEARCH_PATHS)
  if( CMAKE_HOST_WIN32 )
   file( TO_CMAKE_PATH "$ENV{PROGRAMFILES}" ANDROID_NDK_SEARCH_PATHS )
@@ -449,19 +459,32 @@ if( ANDROID_FORBID_SYGWIN )
  endif()
 endif()
 
+
 # detect current host platform
+if( NOT DEFINED ANDROID_NDK_HOST_X64 AND CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "amd64|x86_64|AMD64")
+ set( ANDROID_NDK_HOST_X64 1 CACHE BOOL "Try to use 64-bit compiler toolchain" )
+ mark_as_advanced( ANDROID_NDK_HOST_X64 )
+endif()
+
 set( TOOL_OS_SUFFIX "" )
 if( CMAKE_HOST_APPLE )
- set( ANDROID_NDK_HOST_SYSTEM_NAME "darwin-x86" )
+ set( ANDROID_NDK_HOST_SYSTEM_NAME "darwin-x86_64" )
+ set( ANDROID_NDK_HOST_SYSTEM_NAME2 "darwin-x86" )
 elseif( CMAKE_HOST_WIN32 )
- set( ANDROID_NDK_HOST_SYSTEM_NAME "windows" )
+ set( ANDROID_NDK_HOST_SYSTEM_NAME "windows-x86_64" )
+ set( ANDROID_NDK_HOST_SYSTEM_NAME2 "windows" )
  set( TOOL_OS_SUFFIX ".exe" )
 elseif( CMAKE_HOST_UNIX )
- set( ANDROID_NDK_HOST_SYSTEM_NAME "linux-x86" )
+ set( ANDROID_NDK_HOST_SYSTEM_NAME "linux-x86_64" )
+ set( ANDROID_NDK_HOST_SYSTEM_NAME2 "linux-x86" )
 else()
  message( FATAL_ERROR "Cross-compilation on your platform is not supported by this cmake toolchain" )
 endif()
 
+if( NOT ANDROID_NDK_HOST_X64 )
+ set( ANDROID_NDK_HOST_SYSTEM_NAME ${ANDROID_NDK_HOST_SYSTEM_NAME2} )
+endif()
+
 # see if we have path to Android NDK
 __INIT_VARIABLE( ANDROID_NDK PATH ENV_ANDROID_NDK )
 if( NOT ANDROID_NDK )
@@ -509,7 +532,8 @@ if( ANDROID_NDK )
  endif()
  set( ANDROID_NDK "${ANDROID_NDK}" CACHE INTERNAL "Path of the Android NDK" FORCE )
  set( BUILD_WITH_ANDROID_NDK True )
- file( STRINGS "${ANDROID_NDK}/RELEASE.TXT" ANDROID_NDK_RELEASE LIMIT_COUNT 1 REGEX r[0-9]+[a-z]? )
+ file( STRINGS "${ANDROID_NDK}/RELEASE.TXT" ANDROID_NDK_RELEASE_FULL LIMIT_COUNT 1 REGEX r[0-9]+[a-z]? )
+ string( REGEX MATCH r[0-9]+[a-z]? ANDROID_NDK_RELEASE "${ANDROID_NDK_RELEASE_FULL}" )
 elseif( ANDROID_STANDALONE_TOOLCHAIN )
  get_filename_component( ANDROID_STANDALONE_TOOLCHAIN "${ANDROID_STANDALONE_TOOLCHAIN}" ABSOLUTE )
  # try to detect change
@@ -563,22 +587,21 @@ if( BUILD_WITH_STANDALONE_TOOLCHAIN )
  endif()
 endif()
 
-macro( __GLOB_NDK_TOOLCHAINS __availableToolchainsVar )
- foreach( __toolchain ${${__availableToolchainsVar}} )
+macro( __GLOB_NDK_TOOLCHAINS __availableToolchainsVar __availableToolchainsLst __host_system_name )
+ foreach( __toolchain ${${__availableToolchainsLst}} )
   if( "${__toolchain}" MATCHES "-clang3[.][0-9]$" AND NOT EXISTS "${ANDROID_NDK}/toolchains/${__toolchain}/prebuilt/" )
    string( REGEX REPLACE "-clang3[.][0-9]$" "-4.6" __gcc_toolchain "${__toolchain}" )
   else()
    set( __gcc_toolchain "${__toolchain}" )
   endif()
-  __DETECT_TOOLCHAIN_MACHINE_NAME( __machine "${ANDROID_NDK}/toolchains/${__gcc_toolchain}/prebuilt/${ANDROID_NDK_HOST_SYSTEM_NAME}" )
+  __DETECT_TOOLCHAIN_MACHINE_NAME( __machine "${ANDROID_NDK}/toolchains/${__gcc_toolchain}/prebuilt/${__host_system_name}" )
   if( __machine )
    string( REGEX MATCH "[0-9]+[.][0-9]+([.][0-9]+)?$" __version "${__gcc_toolchain}" )
    string( REGEX MATCH "^[^-]+" __arch "${__gcc_toolchain}" )
    list( APPEND __availableToolchainMachines "${__machine}" )
    list( APPEND __availableToolchainArchs "${__arch}" )
    list( APPEND __availableToolchainCompilerVersions "${__version}" )
-  else()
-   list( REMOVE_ITEM ${__availableToolchainsVar} "${__toolchain}" )
+   list( APPEND ${__availableToolchainsVar} "${__toolchain}" )
   endif()
   unset( __gcc_toolchain )
  endforeach()
@@ -594,17 +617,29 @@ if( BUILD_WITH_ANDROID_NDK )
  set( __availableToolchainCompilerVersions "" )
  if( ANDROID_TOOLCHAIN_NAME AND EXISTS "${ANDROID_NDK}/toolchains/${ANDROID_TOOLCHAIN_NAME}/" )
   # do not go through all toolchains if we know the name
-  set( __availableToolchains "${ANDROID_TOOLCHAIN_NAME}" )
-  __GLOB_NDK_TOOLCHAINS( __availableToolchains )
+  set( __availableToolchainsLst "${ANDROID_TOOLCHAIN_NAME}" )
+  __GLOB_NDK_TOOLCHAINS( __availableToolchains __availableToolchainsLst ${ANDROID_NDK_HOST_SYSTEM_NAME} )
+  if( NOT __availableToolchains AND NOT ANDROID_NDK_HOST_SYSTEM_NAME STREQUAL ANDROID_NDK_HOST_SYSTEM_NAME2 )
+   __GLOB_NDK_TOOLCHAINS( __availableToolchains __availableToolchainsLst ${ANDROID_NDK_HOST_SYSTEM_NAME2} )
+   if( __availableToolchains )
+    set( ANDROID_NDK_HOST_SYSTEM_NAME ${ANDROID_NDK_HOST_SYSTEM_NAME2} )
+   endif()
+  endif()
  endif()
  if( NOT __availableToolchains )
-  file( GLOB __availableToolchains RELATIVE "${ANDROID_NDK}/toolchains" "${ANDROID_NDK}/toolchains/*" )
+  file( GLOB __availableToolchainsLst RELATIVE "${ANDROID_NDK}/toolchains" "${ANDROID_NDK}/toolchains/*" )
   if( __availableToolchains )
-   list(SORT __availableToolchains) # we need clang to go after gcc
+   list(SORT __availableToolchainsLst) # we need clang to go after gcc
+  endif()
+  __LIST_FILTER( __availableToolchainsLst "^[.]" )
+  __LIST_FILTER( __availableToolchainsLst "llvm" )
+  __GLOB_NDK_TOOLCHAINS( __availableToolchains __availableToolchainsLst ${ANDROID_NDK_HOST_SYSTEM_NAME} )
+  if( NOT __availableToolchains AND NOT ANDROID_NDK_HOST_SYSTEM_NAME STREQUAL ANDROID_NDK_HOST_SYSTEM_NAME2 )
+   __GLOB_NDK_TOOLCHAINS( __availableToolchains __availableToolchainsLst ${ANDROID_NDK_HOST_SYSTEM_NAME2} )
+   if( __availableToolchains )
+    set( ANDROID_NDK_HOST_SYSTEM_NAME ${ANDROID_NDK_HOST_SYSTEM_NAME2} )
+   endif()
   endif()
-  __LIST_FILTER( __availableToolchains "^[.]" )
-  __LIST_FILTER( __availableToolchains "llvm" )
-  __GLOB_NDK_TOOLCHAINS( __availableToolchains )
  endif()
  if( NOT __availableToolchains )
   message( FATAL_ERROR "Could not find any working toolchain in the NDK. Probably your Android NDK is broken." )
@@ -617,11 +652,11 @@ set( __uniqToolchainArchNames ${__availableToolchainArchs} )
 list( REMOVE_DUPLICATES __uniqToolchainArchNames )
 list( SORT __uniqToolchainArchNames )
 foreach( __arch ${__uniqToolchainArchNames} )
-list( APPEND ANDROID_SUPPORTED_ABIS ${ANDROID_SUPPORTED_ABIS_${__arch}} )
+ list( APPEND ANDROID_SUPPORTED_ABIS ${ANDROID_SUPPORTED_ABIS_${__arch}} )
 endforeach()
 unset( __uniqToolchainArchNames )
 if( NOT ANDROID_SUPPORTED_ABIS )
-message( FATAL_ERROR "No one of known Android ABIs is supported by this cmake toolchain." )
+ message( FATAL_ERROR "No one of known Android ABIs is supported by this cmake toolchain." )
 endif()
 
 # choose target ABI
@@ -760,11 +795,22 @@ unset( __availableToolchainCompilerVersions )
 # choose native API level
 __INIT_VARIABLE( ANDROID_NATIVE_API_LEVEL ENV_ANDROID_NATIVE_API_LEVEL ANDROID_API_LEVEL ENV_ANDROID_API_LEVEL ANDROID_STANDALONE_TOOLCHAIN_API_LEVEL ANDROID_DEFAULT_NDK_API_LEVEL_${ANDROID_ARCH_NAME} ANDROID_DEFAULT_NDK_API_LEVEL )
 string( REGEX MATCH "[0-9]+" ANDROID_NATIVE_API_LEVEL "${ANDROID_NATIVE_API_LEVEL}" )
-# TODO: filter out unsupported levels
+# adjust API level
+set( __real_api_level ${ANDROID_DEFAULT_NDK_API_LEVEL_${ANDROID_ARCH_NAME}} )
+foreach( __level ${ANDROID_SUPPORTED_NATIVE_API_LEVELS} )
+ if( NOT __level GREATER ANDROID_NATIVE_API_LEVEL AND NOT __level LESS __real_api_level )
+  set( __real_api_level ${__level} )
+ endif()
+endforeach()
+if( __real_api_level AND NOT ANDROID_NATIVE_API_LEVEL EQUAL __real_api_level )
+ message( STATUS "Adjusting Android API level 'android-${ANDROID_NATIVE_API_LEVEL}' to 'android-${__real_api_level}'")
+ set( ANDROID_NATIVE_API_LEVEL ${__real_api_level} )
+endif()
+unset(__real_api_level)
 # validate
 list( FIND ANDROID_SUPPORTED_NATIVE_API_LEVELS "${ANDROID_NATIVE_API_LEVEL}" __levelIdx )
 if( __levelIdx EQUAL -1 )
- message( SEND_ERROR "Specified Android native API level (${ANDROID_NATIVE_API_LEVEL}) is not supported by your NDK/toolchain." )
+ message( SEND_ERROR "Specified Android native API level 'android-${ANDROID_NATIVE_API_LEVEL}' is not supported by your NDK/toolchain." )
 else()
  if( BUILD_WITH_ANDROID_NDK )
   __DETECT_NATIVE_API_LEVEL( __realApiLevel "${ANDROID_NDK}/platforms/android-${ANDROID_NATIVE_API_LEVEL}/arch-${ANDROID_ARCH_NAME}/usr/include/android/api-level.h" )
@@ -926,7 +972,7 @@ elseif( "${ANDROID_TOOLCHAIN_NAME}" MATCHES "-clang3[.][0-9]?$" )
  string( REGEX MATCH "3[.][0-9]$" ANDROID_CLANG_VERSION "${ANDROID_TOOLCHAIN_NAME}")
  string( REGEX REPLACE "-clang${ANDROID_CLANG_VERSION}$" "-4.6" ANDROID_GCC_TOOLCHAIN_NAME "${ANDROID_TOOLCHAIN_NAME}" )
  if( NOT EXISTS "${ANDROID_NDK}/toolchains/llvm-${ANDROID_CLANG_VERSION}/prebuilt/${ANDROID_NDK_HOST_SYSTEM_NAME}/bin/clang${TOOL_OS_SUFFIX}" )
-  message( FATAL_ERROR "Could not find the " )
+  message( FATAL_ERROR "Could not find the Clang compiler driver" )
  endif()
  set( ANDROID_COMPILER_IS_CLANG 1 )
  set( ANDROID_CLANG_TOOLCHAIN_ROOT "${ANDROID_NDK}/toolchains/llvm-${ANDROID_CLANG_VERSION}/prebuilt/${ANDROID_NDK_HOST_SYSTEM_NAME}" )
@@ -1140,38 +1186,52 @@ endif()
 
 # NDK flags
 if( ARMEABI OR ARMEABI_V7A )
- set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fpic -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__" )
+ set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fpic -funwind-tables" )
  if( NOT ANDROID_FORCE_ARM_BUILD AND NOT ARMEABI_V6 )
-  # It is recommended to use the -mthumb compiler flag to force the generation
-  # of 16-bit Thumb-1 instructions (the default being 32-bit ARM ones).
-  set( ANDROID_CXX_FLAGS_RELEASE "-mthumb" )
-  set( ANDROID_CXX_FLAGS_DEBUG   "-marm -finline-limit=64" )
+  set( ANDROID_CXX_FLAGS_RELEASE "-mthumb -fomit-frame-pointer -fno-strict-aliasing" )
+  set( ANDROID_CXX_FLAGS_DEBUG   "-marm -fno-omit-frame-pointer -fno-strict-aliasing" )
+  if( NOT ANDROID_COMPILER_IS_CLANG )
+   set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -finline-limit=64" )
+  endif()
  else()
   # always compile ARMEABI_V6 in arm mode; otherwise there is no difference from ARMEABI
-  # O3 instead of O2/Os in release mode - like cmake sets for desktop gcc
-  set( ANDROID_CXX_FLAGS_RELEASE "-marm" )
-  set( ANDROID_CXX_FLAGS_DEBUG   "-marm -finline-limit=300" )
+  set( ANDROID_CXX_FLAGS_RELEASE "-marm -fomit-frame-pointer -fstrict-aliasing" )
+  set( ANDROID_CXX_FLAGS_DEBUG   "-marm -fno-omit-frame-pointer -fno-strict-aliasing" )
+  if( NOT ANDROID_COMPILER_IS_CLANG )
+   set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -funswitch-loops -finline-limit=300" )
+  endif()
  endif()
 elseif( X86 )
  set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -funwind-tables" )
- set( ANDROID_CXX_FLAGS_RELEASE "" )
- set( ANDROID_CXX_FLAGS_DEBUG   "-finline-limit=300" )
+ if( NOT ANDROID_COMPILER_IS_CLANG )
+  set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -funswitch-loops -finline-limit=300" )
+ else()
+  set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fPIC" )
+ endif()
+ set( ANDROID_CXX_FLAGS_RELEASE "-fomit-frame-pointer -fstrict-aliasing" )
+ set( ANDROID_CXX_FLAGS_DEBUG   "-fno-omit-frame-pointer -fno-strict-aliasing" )
 elseif( MIPS )
- set( ANDROID_CXX_FLAGS         "${ANDROID_CXX_FLAGS} -fpic -funwind-tables -fmessage-length=0 -fno-inline-functions-called-once -frename-registers" )
- set( ANDROID_CXX_FLAGS_RELEASE "-finline-limit=300 -fno-strict-aliasing" )
- set( ANDROID_CXX_FLAGS_DEBUG   "-finline-functions -fgcse-after-reload -frerun-cse-after-loop" )
+ set( ANDROID_CXX_FLAGS         "${ANDROID_CXX_FLAGS} -fpic -fno-strict-aliasing -finline-functions -ffunction-sections -funwind-tables -fmessage-length=0" )
+ set( ANDROID_CXX_FLAGS_RELEASE "-fomit-frame-pointer" )
+ set( ANDROID_CXX_FLAGS_DEBUG   "-fno-omit-frame-pointer" )
+ if( NOT ANDROID_COMPILER_IS_CLANG )
+  set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fno-inline-functions-called-once -fgcse-after-reload -frerun-cse-after-loop -frename-registers" )
+  set( ANDROID_CXX_FLAGS_RELEASE "${ANDROID_CXX_FLAGS_RELEASE} -funswitch-loops -finline-limit=300" )
+ endif()
 elseif()
  set( ANDROID_CXX_FLAGS_RELEASE "" )
  set( ANDROID_CXX_FLAGS_DEBUG   "" )
 endif()
 
-if( NOT X86 )
+set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fsigned-char" ) # good/necessary when porting desktop libraries
+
+if( NOT X86 AND NOT ANDROID_COMPILER_IS_CLANG )
  set( ANDROID_CXX_FLAGS "-Wno-psabi ${ANDROID_CXX_FLAGS}" )
 endif()
 
-set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fsigned-char" ) # good/necessary when porting desktop libraries
-set( ANDROID_CXX_FLAGS_RELEASE "${ANDROID_CXX_FLAGS_RELEASE} -fomit-frame-pointer" )
-set( ANDROID_CXX_FLAGS_DEBUG   "${ANDROID_CXX_FLAGS_DEBUG} -fno-strict-aliasing -fno-omit-frame-pointer" )
+if( NOT ANDROID_COMPILER_VERSION VERSION_LESS "4.6" )
+ set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -no-canonical-prefixes" ) # see https://android-review.googlesource.com/#/c/47564/
+endif()
 
 # ABI-specific flags
 if( ARMEABI_V7A )
@@ -1308,9 +1368,6 @@ if( ANDROID_COMPILER_IS_CLANG )
   set( ANDROID_CXX_FLAGS "-target ${ANDROID_LLVM_TRIPLE} ${ANDROID_CXX_FLAGS}" )
  endif()
  if( BUILD_WITH_ANDROID_NDK )
-  if(ANDROID_ARCH_NAME STREQUAL "arm" )
-   set( ANDROID_CXX_FLAGS "-isystem ${ANDROID_CLANG_TOOLCHAIN_ROOT}/lib/clang/${ANDROID_CLANG_VERSION}/include ${ANDROID_CXX_FLAGS}" )
-  endif()
   set( ANDROID_CXX_FLAGS "-gcc-toolchain ${ANDROID_TOOLCHAIN_ROOT} ${ANDROID_CXX_FLAGS}" )
  endif()
 endif()
@@ -1326,6 +1383,12 @@ set( CMAKE_SHARED_LINKER_FLAGS ""                        CACHE STRING "shared li
 set( CMAKE_MODULE_LINKER_FLAGS ""                        CACHE STRING "module linker flags" )
 set( CMAKE_EXE_LINKER_FLAGS    "-Wl,-z,nocopyreloc"      CACHE STRING "executable linker flags" )
 
+# put flags to cache (for debug purpose only)
+set( ANDROID_CXX_FLAGS         "${ANDROID_CXX_FLAGS}"         CACHE INTERNAL "Android specific c/c++ flags" )
+set( ANDROID_CXX_FLAGS_RELEASE "${ANDROID_CXX_FLAGS_RELEASE}" CACHE INTERNAL "Android specific c/c++ Release flags" )
+set( ANDROID_CXX_FLAGS_DEBUG   "${ANDROID_CXX_FLAGS_DEBUG}"   CACHE INTERNAL "Android specific c/c++ Debug flags" )
+set( ANDROID_LINKER_FLAGS      "${ANDROID_LINKER_FLAGS}"      CACHE INTERNAL "Android specific c/c++ linker flags" )
+
 # finish flags
 set( CMAKE_CXX_FLAGS           "${ANDROID_CXX_FLAGS} ${CMAKE_CXX_FLAGS}" )
 set( CMAKE_C_FLAGS             "${ANDROID_CXX_FLAGS} ${CMAKE_C_FLAGS}" )
@@ -1456,6 +1519,7 @@ endmacro()
 if( NOT PROJECT_NAME STREQUAL "CMAKE_TRY_COMPILE" )
  set( __toolchain_config "")
  foreach( __var NDK_CCACHE  LIBRARY_OUTPUT_PATH_ROOT  ANDROID_FORBID_SYGWIN  ANDROID_SET_OBSOLETE_VARIABLES
+                ANDROID_NDK_HOST_X64
                 ANDROID_NDK
                 ANDROID_STANDALONE_TOOLCHAIN
                 ANDROID_TOOLCHAIN_NAME
@@ -1512,6 +1576,7 @@ endif()
 #   ANDROID_NDK
 #   ANDROID_STANDALONE_TOOLCHAIN
 #   ANDROID_TOOLCHAIN_NAME : the NDK name of compiler toolchain
+#   ANDROID_NDK_HOST_X64 : try to use x86_64 toolchain (default for x64 host systems)
 #   LIBRARY_OUTPUT_PATH_ROOT : <any valid path>
 #   NDK_CCACHE : <path to your ccache executable>
 # Obsolete:
@@ -1536,7 +1601,7 @@ endif()
 #   BUILD_WITH_STANDALONE_TOOLCHAIN : TRUE if standalone toolchain is used
 #   ANDROID_NDK_HOST_SYSTEM_NAME : "windows", "linux-x86" or "darwin-x86" depending on host platform
 #   ANDROID_NDK_ABI_NAME : "armeabi", "armeabi-v7a", "x86" or "mips" depending on ANDROID_ABI
-#   ANDROID_NDK_RELEASE : one of r5, r5b, r5c, r6, r6b, r7, r7b, r7c, r8, r8b, r8c, r8d; set only for NDK
+#   ANDROID_NDK_RELEASE : one of r5, r5b, r5c, r6, r6b, r7, r7b, r7c, r8, r8b, r8c, r8d, r8e; set only for NDK
 #   ANDROID_ARCH_NAME : "arm" or "x86" or "mips" depending on ANDROID_ABI
 #   ANDROID_SYSROOT : path to the compiler sysroot
 #   TOOL_OS_SUFFIX : "" or ".exe" depending on host platform