Android: Detect and save a toolchain from the NDK

2 files changed, 296 insertions, 0 deletions

diff --git a/Modules/Platform/Android/Determine-Compiler-NDK.cmake b/Modules/Platform/Android/Determine-Compiler-NDK.cmake
new file mode 100644
index 0000000..8bd0de9
--- /dev/null
+++ b/Modules/Platform/Android/Determine-Compiler-NDK.cmake
@@ -0,0 +1,256 @@
+#=============================================================================
+# Copyright 2015-2016 Kitware, Inc.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+# In Android NDK releases there is build system toolchain selection logic in
+# these files:
+#
+# * <ndk>/build/core/init.mk
+# * <ndk>/build/core/setup-toolchain.mk
+# * <ndk>/[build/core/]toolchains/<toolchain>/{config.mk,setup.mk}
+#
+# We parse information out of the ``config.mk`` and ``setup.mk`` files below.
+#
+# There is also a "toolchains" directory with the prebuilt toolchains themselves:
+#
+# * <triple-or-arch>-<gcc-version>/prebuilt/<host>/bin/<triple>-gcc(.exe)?
+#   The gcc compiler to be invoked.
+#
+# * llvm*/prebuilt/<host>/bin/clang
+#   The clang compiler to be invoked with flags:
+#     -target <triple>
+#     -gcc-toolchain <ndk>/toolchains/<triple-or-arch>-<gcc-version>
+
+# Glob available toolchains in the NDK, restricted by any version request.
+if(CMAKE_ANDROID_NDK_TOOLCHAIN_VERSION STREQUAL "clang")
+  set(_ANDROID_TOOL_PATTERNS "*-clang" "*-clang[0-9].[0-9]")
+elseif(CMAKE_ANDROID_NDK_TOOLCHAIN_VERSION)
+  if(NOT CMAKE_ANDROID_NDK_TOOLCHAIN_VERSION MATCHES "^(clang)?[0-9]\\.[0-9]$")
+    message(FATAL_ERROR
+      "Android: The CMAKE_ANDROID_NDK_TOOLCHAIN_VERSION value '${CMAKE_ANDROID_NDK_TOOLCHAIN_VERSION}' "
+      "is not one of the allowed forms:\n"
+      "  <major>.<minor>       = GCC of specified version\n"
+      "  clang<major>.<minor>  = Clang of specified version\n"
+      "  clang                 = Clang of most recent available version\n"
+      )
+  endif()
+  set(_ANDROID_TOOL_PATTERNS "*-${CMAKE_ANDROID_NDK_TOOLCHAIN_VERSION}")
+else()
+  set(_ANDROID_TOOL_PATTERNS "*-[0-9].[0-9]")
+endif()
+set(_ANDROID_CONFIG_MK_PATTERNS)
+foreach(base "build/core/toolchains" "toolchains")
+  foreach(pattern IN LISTS _ANDROID_TOOL_PATTERNS)
+    list(APPEND _ANDROID_CONFIG_MK_PATTERNS
+      "${CMAKE_ANDROID_NDK}/${base}/${pattern}/config.mk"
+      )
+  endforeach()
+endforeach()
+unset(_ANDROID_TOOL_PATTERNS)
+file(GLOB _ANDROID_CONFIG_MKS ${_ANDROID_CONFIG_MK_PATTERNS})
+unset(_ANDROID_CONFIG_MK_PATTERNS)
+
+# Find the newest toolchain version matching the ABI.
+set(_ANDROID_TOOL_NAME "")
+set(_ANDROID_TOOL_VERS 0)
+set(_ANDROID_TOOL_SETUP_MK "")
+foreach(config_mk IN LISTS _ANDROID_CONFIG_MKS)
+  # Check that the toolchain matches the ABI.
+  file(STRINGS "${config_mk}" _ANDROID_TOOL_ABIS REGEX "^TOOLCHAIN_ABIS :=.* ${CMAKE_ANDROID_ARCH_ABI}( |$)")
+  if(NOT _ANDROID_TOOL_ABIS)
+    continue()
+  endif()
+  unset(_ANDROID_TOOL_ABIS)
+
+  # Check the version.
+  if("${config_mk}" MATCHES [[/([^/]+-(clang)?([0-9]\.[0-9]|))/config.mk$]])
+    set(_ANDROID_CUR_NAME "${CMAKE_MATCH_1}")
+    set(_ANDROID_CUR_VERS "${CMAKE_MATCH_3}")
+    if(_ANDROID_TOOL_VERS STREQUAL "")
+      # already the latest possible
+    elseif(_ANDROID_CUR_VERS STREQUAL "" OR _ANDROID_CUR_VERS VERSION_GREATER _ANDROID_TOOL_VERS)
+      set(_ANDROID_TOOL_NAME "${_ANDROID_CUR_NAME}")
+      set(_ANDROID_TOOL_VERS "${_ANDROID_CUR_VERS}")
+      string(REPLACE "/config.mk" "/setup.mk" _ANDROID_TOOL_SETUP_MK "${config_mk}")
+    endif()
+    unset(_ANDROID_CUR_TOOL)
+    unset(_ANDROID_CUR_VERS)
+  endif()
+endforeach()
+
+# Verify that we have a suitable toolchain.
+if(NOT _ANDROID_TOOL_NAME)
+  if(_ANDROID_CONFIG_MKS)
+    string(REPLACE ";" "\n  " _ANDROID_TOOLS_MSG "after considering:;${_ANDROID_CONFIG_MKS}")
+  else()
+    set(_ANDROID_TOOLS_MSG "")
+  endif()
+  if(CMAKE_ANDROID_NDK_TOOLCHAIN_VERSION)
+    string(CONCAT _ANDROID_TOOLS_MSG
+      "of the version specified by CMAKE_ANDROID_NDK_TOOLCHAIN_VERSION:\n"
+      "  ${CMAKE_ANDROID_NDK_TOOLCHAIN_VERSION}\n"
+      "${_ANDROID_TOOLS_MSG}")
+  endif()
+  message(FATAL_ERROR
+    "Android: No toolchain for ABI '${CMAKE_ANDROID_ARCH_ABI}' found in the NDK:\n"
+    "  ${CMAKE_ANDROID_NDK}\n"
+    "${_ANDROID_TOOLS_MSG}"
+    )
+endif()
+unset(_ANDROID_CONFIG_MKS)
+
+# For clang toolchains we still need to find a gcc toolchain.
+if(_ANDROID_TOOL_NAME MATCHES "-clang")
+  set(_ANDROID_TOOL_CLANG_NAME "${_ANDROID_TOOL_NAME}")
+  set(_ANDROID_TOOL_CLANG_VERS "${_ANDROID_TOOL_VERS}")
+  set(_ANDROID_TOOL_NAME "")
+  set(_ANDROID_TOOL_VERS "")
+else()
+  set(_ANDROID_TOOL_CLANG_NAME "")
+  set(_ANDROID_TOOL_CLANG_VERS "")
+endif()
+
+# Parse the toolchain setup.mk file to extract information we need.
+# Their content is not standardized across toolchains or NDK versions,
+# so we match known cases.  Note that the parsing is stateful across
+# lines because we need to substitute for some Make variable references.
+if(CMAKE_ANDROID_NDK_TOOLCHAIN_DEBUG)
+  message(STATUS "loading: ${_ANDROID_TOOL_SETUP_MK}")
+endif()
+file(STRINGS "${_ANDROID_TOOL_SETUP_MK}" _ANDROID_TOOL_SETUP REGEX "^(LLVM|TOOLCHAIN)_[A-Z_]+ +:= +.*$")
+unset(_ANDROID_TOOL_SETUP_MK)
+set(_ANDROID_TOOL_PREFIX "")
+set(_ANDROID_TOOL_NAME_ONLY "")
+set(_ANDROID_TOOL_LLVM_NAME "")
+set(_ANDROID_TOOL_LLVM_VERS "")
+foreach(line IN LISTS _ANDROID_TOOL_SETUP)
+  if(CMAKE_ANDROID_NDK_TOOLCHAIN_DEBUG)
+    message(STATUS "setup.mk: ${line}")
+  endif()
+
+  if(line MATCHES [[^TOOLCHAIN_PREFIX +:= +.*/bin/([^$/ ]*) *$]])
+    # We just matched the toolchain prefix with no Make variable references.
+    set(_ANDROID_TOOL_PREFIX "${CMAKE_MATCH_1}")
+  elseif(_ANDROID_TOOL_CLANG_NAME)
+    # For clang toolchains we need to find more information.
+    if(line MATCHES [[^TOOLCHAIN_VERSION +:= +([0-9.]+) *$]])
+      # We just matched the gcc toolchain version number.  Save it for later.
+      set(_ANDROID_TOOL_VERS "${CMAKE_MATCH_1}")
+    elseif(line MATCHES [[^TOOLCHAIN_NAME +:= +(.*\$\(TOOLCHAIN_VERSION\)) *$]])
+      # We just matched the gcc toolchain name with a version number placeholder, so substitute it.
+      # The gcc toolchain version number will have already been extracted from a TOOLCHAIN_VERSION line.
+      string(REPLACE "$(TOOLCHAIN_VERSION)" "${_ANDROID_TOOL_VERS}" _ANDROID_TOOL_NAME "${CMAKE_MATCH_1}")
+    elseif(line MATCHES [[^TOOLCHAIN_NAME +:= +([^$/ ]+) *$]])
+      # We just matched the gcc toolchain name without version number.  Save it for later.
+      set(_ANDROID_TOOL_NAME_ONLY "${CMAKE_MATCH_1}")
+    elseif(line MATCHES [[^TOOLCHAIN_PREFIX +:= +.*/bin/(\$\(TOOLCHAIN_NAME\)-) *$]])
+      # We just matched the toolchain prefix with a name placholder, so substitute it.
+      # The gcc toolchain name will have already been extracted without version number from a TOOLCHAIN_NAME line.
+      string(REPLACE "$(TOOLCHAIN_NAME)" "${_ANDROID_TOOL_NAME_ONLY}" _ANDROID_TOOL_PREFIX "${CMAKE_MATCH_1}")
+    elseif(line MATCHES [[^LLVM_VERSION +:= +([0-9.]+)$]])
+      # We just matched the llvm prebuilt binary toolchain version number.  Save it for later.
+      set(_ANDROID_TOOL_LLVM_VERS "${CMAKE_MATCH_1}")
+    elseif(line MATCHES [[^LLVM_NAME +:= +(llvm-\$\(LLVM_VERSION\)) *$]])
+      # We just matched the llvm prebuilt binary toolchain directory name with a version number placeholder,
+      # so substitute it. The llvm prebuilt binary toolchain version number will have already been extracted
+      # from a LLVM_VERSION line.
+      string(REPLACE "$(LLVM_VERSION)" "${_ANDROID_TOOL_LLVM_VERS}" _ANDROID_TOOL_LLVM_NAME "${CMAKE_MATCH_1}")
+    elseif(line MATCHES [[^LLVM_TOOLCHAIN_PREBUILT_ROOT +:= +\$\(call get-toolchain-root.*,([^$ ]+)\) *$]])
+      # We just matched the llvm prebuilt binary toolchain directory name.
+      set(_ANDROID_TOOL_LLVM_NAME "${CMAKE_MATCH_1}")
+    elseif(line MATCHES [[^TOOLCHAIN_ROOT +:= +\$\(call get-toolchain-root.*,(\$\(TOOLCHAIN_NAME\)-[0-9.]+)\) *$]])
+      # We just matched a placeholder for the name followed by a version number.
+      # The gcc toolchain name will have already been extracted without version number from a TOOLCHAIN_NAME line.
+      # Substitute for the placeholder to get the full gcc toolchain name.
+      string(REPLACE "$(TOOLCHAIN_NAME)" "${_ANDROID_TOOL_NAME_ONLY}" _ANDROID_TOOL_NAME "${CMAKE_MATCH_1}")
+    elseif(line MATCHES [[^TOOLCHAIN_ROOT +:= +\$\(call get-toolchain-root.*,([^$ ]+)\) *$]])
+      # We just matched the full gcc toolchain name without placeholder.
+      set(_ANDROID_TOOL_NAME "${CMAKE_MATCH_1}")
+    endif()
+  endif()
+endforeach()
+unset(_ANDROID_TOOL_NAME_ONLY)
+unset(_ANDROID_TOOL_LLVM_VERS)
+unset(_ANDROID_TOOL_SETUP)
+
+# Fall back to parsing the version and prefix from the tool name.
+if(NOT _ANDROID_TOOL_VERS AND "${_ANDROID_TOOL_NAME}" MATCHES "-([0-9.]+)$")
+  set(_ANDROID_TOOL_VERS "${CMAKE_MATCH_1}")
+endif()
+if(NOT _ANDROID_TOOL_PREFIX AND "${_ANDROID_TOOL_NAME}" MATCHES "^(.*-)[0-9.]+$")
+  set(_ANDROID_TOOL_PREFIX "${CMAKE_MATCH_1}")
+endif()
+
+# Identify the host platform.
+if(CMAKE_HOST_SYSTEM_NAME STREQUAL "Darwin")
+  if(CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "x86_64")
+    set(_ANDROID_HOST_DIR "darwin-x86_64")
+  else()
+    set(_ANDROID_HOST_DIR "darwin-x86")
+  endif()
+elseif(CMAKE_HOST_SYSTEM_NAME STREQUAL "Linux")
+  if(CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "x86_64")
+    set(_ANDROID_HOST_DIR "linux-x86_64")
+  else()
+    set(_ANDROID_HOST_DIR "linux-x86")
+  endif()
+elseif(CMAKE_HOST_SYSTEM_NAME STREQUAL "Windows")
+  if(CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "AMD64")
+    set(_ANDROID_HOST_DIR "windows-x86_64")
+  else()
+    set(_ANDROID_HOST_DIR "windows")
+  endif()
+else()
+  message(FATAL_ERROR "Android: Builds hosted on '${CMAKE_HOST_SYSTEM_NAME}' not supported.")
+endif()
+
+# Help CMakeFindBinUtils locate things.
+set(_CMAKE_TOOLCHAIN_PREFIX "${_ANDROID_TOOL_PREFIX}")
+
+set(_ANDROID_TOOL_C_TOOLCHAIN_VERSION "${_ANDROID_TOOL_VERS}")
+set(_ANDROID_TOOL_C_TOOLCHAIN_PREFIX "${CMAKE_ANDROID_NDK}/toolchains/${_ANDROID_TOOL_NAME}/prebuilt/${_ANDROID_HOST_DIR}/bin/${_ANDROID_TOOL_PREFIX}")
+set(_ANDROID_TOOL_C_TOOLCHAIN_SUFFIX "${_ANDROID_HOST_EXT}")
+
+set(_ANDROID_TOOL_CXX_TOOLCHAIN_VERSION "${_ANDROID_TOOL_C_TOOLCHAIN_VERSION}")
+set(_ANDROID_TOOL_CXX_TOOLCHAIN_PREFIX "${_ANDROID_TOOL_C_TOOLCHAIN_PREFIX}")
+set(_ANDROID_TOOL_CXX_TOOLCHAIN_SUFFIX "${_ANDROID_TOOL_C_TOOLCHAIN_SUFFIX}")
+
+if(_ANDROID_TOOL_CLANG_NAME)
+  message(STATUS "Android: Selected Clang toolchain '${_ANDROID_TOOL_CLANG_NAME}' with GCC toolchain '${_ANDROID_TOOL_NAME}'")
+  set(_ANDROID_TOOL_C_COMPILER "${CMAKE_ANDROID_NDK}/toolchains/${_ANDROID_TOOL_LLVM_NAME}/prebuilt/${_ANDROID_HOST_DIR}/bin/clang${_ANDROID_HOST_EXT}")
+  set(_ANDROID_TOOL_C_COMPILER_EXTERNAL_TOOLCHAIN ${CMAKE_ANDROID_NDK}/toolchains/${_ANDROID_TOOL_NAME}/prebuilt/${_ANDROID_HOST_DIR})
+  set(_ANDROID_TOOL_CXX_COMPILER "${CMAKE_ANDROID_NDK}/toolchains/${_ANDROID_TOOL_LLVM_NAME}/prebuilt/${_ANDROID_HOST_DIR}/bin/clang++${_ANDROID_HOST_EXT}")
+  set(_ANDROID_TOOL_CXX_COMPILER_EXTERNAL_TOOLCHAIN "${_ANDROID_TOOL_C_COMPILER_EXTERNAL_TOOLCHAIN}")
+else()
+  message(STATUS "Android: Selected GCC toolchain '${_ANDROID_TOOL_NAME}'")
+  set(_ANDROID_TOOL_C_COMPILER "${_ANDROID_TOOL_C_TOOLCHAIN_PREFIX}gcc${_ANDROID_TOOL_C_TOOLCHAIN_SUFFIX}")
+  set(_ANDROID_TOOL_C_COMPILER_EXTERNAL_TOOLCHAIN "")
+  set(_ANDROID_TOOL_CXX_COMPILER "${_ANDROID_TOOL_CXX_TOOLCHAIN_PREFIX}g++${_ANDROID_TOOL_CXX_TOOLCHAIN_SUFFIX}")
+  set(_ANDROID_TOOL_CXX_COMPILER_EXTERNAL_TOOLCHAIN "")
+endif()
+
+if(CMAKE_ANDROID_NDK_TOOLCHAIN_DEBUG)
+  message(STATUS "_ANDROID_TOOL_NAME=${_ANDROID_TOOL_NAME}")
+  message(STATUS "_ANDROID_TOOL_VERS=${_ANDROID_TOOL_VERS}")
+  message(STATUS "_ANDROID_TOOL_PREFIX=${_ANDROID_TOOL_PREFIX}")
+  message(STATUS "_ANDROID_TOOL_CLANG_NAME=${_ANDROID_TOOL_CLANG_NAME}")
+  message(STATUS "_ANDROID_TOOL_CLANG_VERS=${_ANDROID_TOOL_CLANG_VERS}")
+  message(STATUS "_ANDROID_TOOL_LLVM_NAME=${_ANDROID_TOOL_LLVM_NAME}")
+endif()
+
+unset(_ANDROID_TOOL_NAME)
+unset(_ANDROID_TOOL_VERS)
+unset(_ANDROID_TOOL_PREFIX)
+unset(_ANDROID_TOOL_CLANG_NAME)
+unset(_ANDROID_TOOL_CLANG_VERS)
+unset(_ANDROID_TOOL_LLVM_NAME)
+unset(_ANDROID_HOST_DIR)
diff --git a/Modules/Platform/Android/Determine-Compiler.cmake b/Modules/Platform/Android/Determine-Compiler.cmake
index 67cb671..9649b35 100644
--- a/Modules/Platform/Android/Determine-Compiler.cmake
+++ b/Modules/Platform/Android/Determine-Compiler.cmake
@@ -26,5 +26,45 @@ if(CMAKE_VS_PLATFORM_NAME STREQUAL "Tegra-Android")
   return()
 endif()
 
+# Identify the host platform.
+if(CMAKE_HOST_SYSTEM_NAME STREQUAL "Darwin")
+  set(_ANDROID_HOST_EXT "")
+elseif(CMAKE_HOST_SYSTEM_NAME STREQUAL "Linux")
+  set(_ANDROID_HOST_EXT "")
+elseif(CMAKE_HOST_SYSTEM_NAME STREQUAL "Windows")
+  set(_ANDROID_HOST_EXT ".exe")
+else()
+  message(FATAL_ERROR "Android: Builds hosted on '${CMAKE_HOST_SYSTEM_NAME}' not supported.")
+endif()
+
+if(CMAKE_ANDROID_NDK)
+  include(Platform/Android/Determine-Compiler-NDK)
+else()
+  set(_ANDROID_TOOL_C_COMPILER "")
+  set(_ANDROID_TOOL_C_TOOLCHAIN_VERSION "")
+  set(_ANDROID_TOOL_C_COMPILER_EXTERNAL_TOOLCHAIN "")
+  set(_ANDROID_TOOL_C_TOOLCHAIN_PREFIX "")
+  set(_ANDROID_TOOL_C_TOOLCHAIN_SUFFIX "")
+  set(_ANDROID_TOOL_CXX_COMPILER "")
+  set(_ANDROID_TOOL_CXX_TOOLCHAIN_VERSION "")
+  set(_ANDROID_TOOL_CXX_COMPILER_EXTERNAL_TOOLCHAIN "")
+  set(_ANDROID_TOOL_CXX_TOOLCHAIN_PREFIX "")
+  set(_ANDROID_TOOL_CXX_TOOLCHAIN_SUFFIX "")
+endif()
+
+unset(_ANDROID_HOST_EXT)
+
 macro(__android_determine_compiler lang)
+  if(_ANDROID_TOOL_${lang}_COMPILER)
+    set(CMAKE_${lang}_COMPILER "${_ANDROID_TOOL_${lang}_COMPILER}")
+    set(CMAKE_${lang}_COMPILER_EXTERNAL_TOOLCHAIN "${_ANDROID_TOOL_${lang}_COMPILER_EXTERNAL_TOOLCHAIN}")
+
+    # Save the Android-specific information in CMake${lang}Compiler.cmake.
+    set(CMAKE_${lang}_COMPILER_CUSTOM_CODE "
+set(CMAKE_${lang}_ANDROID_TOOLCHAIN_VERSION \"${_ANDROID_TOOL_${lang}_TOOLCHAIN_VERSION}\")
+set(CMAKE_${lang}_COMPILER_EXTERNAL_TOOLCHAIN \"${_ANDROID_TOOL_${lang}_COMPILER_EXTERNAL_TOOLCHAIN}\")
+set(CMAKE_${lang}_ANDROID_TOOLCHAIN_PREFIX \"${_ANDROID_TOOL_${lang}_TOOLCHAIN_PREFIX}\")
+set(CMAKE_${lang}_ANDROID_TOOLCHAIN_SUFFIX \"${_ANDROID_TOOL_${lang}_TOOLCHAIN_SUFFIX}\")
+")
+  endif()
 endmacro()