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      1 # OS X 10.11 El Capitan has just been released. One of the new features, System
      2 # Integrity Protection, prevents modifying the base OS install, even with sudo.
      3 # This prevents LLVM developers on OS X from being able to easily install new
      4 # system compilers. The feature can be disabled, but to make it easier for
      5 # developers to work without disabling SIP, this file can generate an Xcode
      6 # toolchain. Xcode toolchains are a mostly-undocumented feature that allows
      7 # multiple copies of low level tools to be installed to different locations, and
      8 # users can easily switch between them.
      9 
     10 # Setting an environment variable TOOLCHAINS to the toolchain's identifier will
     11 # result in /usr/bin/<tool> or xcrun <tool> to find the tool in the toolchain.
     12 
     13 # To make this work with Xcode 7.1 and later you can install the toolchain this
     14 # file generates anywhere on your system and set EXTERNAL_TOOLCHAINS_DIR to the
     15 # path specified by $CMAKE_INSTALL_PREFIX/Toolchains
     16 
     17 # This file generates a custom install-xcode-toolchain target which constructs
     18 # and installs a toolchain with the identifier in the pattern:
     19 # org.llvm.${PACKAGE_VERSION}. This toolchain can then be used to override the
     20 # system compiler by setting TOOLCHAINS=org.llvm.${PACKAGE_VERSION} in the
     21 # in the environment.
     22 
     23 # Example usage:
     24 # cmake -G Ninja -DLLVM_CREATE_XCODE_TOOLCHAIN=On
     25 #   -DCMAKE_INSTALL_PREFIX=$PWD/install
     26 # ninja install-xcode-toolchain
     27 # export EXTERNAL_TOOLCHAINS_DIR=$PWD/install/Toolchains
     28 # export TOOLCHAINS=org.llvm.3.8.0svn
     29 
     30 # `xcrun -find clang` should return the installed clang, and `clang --version`
     31 # should show 3.8.0svn.
     32 
     33 if(NOT APPLE)
     34   return()
     35 endif()
     36 
     37 option(LLVM_CREATE_XCODE_TOOLCHAIN "Create a target to install LLVM into an Xcode toolchain" Off)
     38 
     39 if(NOT LLVM_CREATE_XCODE_TOOLCHAIN)
     40   return()
     41 endif()
     42 
     43 execute_process(
     44   COMMAND xcrun -find otool
     45   OUTPUT_VARIABLE clang_path
     46   OUTPUT_STRIP_TRAILING_WHITESPACE
     47   ERROR_FILE /dev/null
     48 )
     49 string(REGEX MATCH "(.*/Toolchains)/.*" toolchains_match ${clang_path})
     50 if(NOT toolchains_match)
     51   message(FATAL_ERROR "Could not identify toolchain dir")
     52 endif()
     53 set(toolchains_dir ${CMAKE_MATCH_1})
     54 
     55 set(XcodeDefaultInfo "${toolchains_dir}/XcodeDefault.xctoolchain/ToolchainInfo.plist")
     56 set(LLVMToolchainDir "${CMAKE_INSTALL_PREFIX}/Toolchains/LLVM${PACKAGE_VERSION}.xctoolchain/")
     57 
     58 add_custom_command(OUTPUT ${LLVMToolchainDir}
     59                     COMMAND ${CMAKE_COMMAND} -E make_directory ${LLVMToolchainDir})
     60 
     61 add_custom_command(OUTPUT ${LLVMToolchainDir}/ToolchainInfo.plist
     62                   DEPENDS ${LLVMToolchainDir}
     63                   COMMAND ${CMAKE_COMMAND} -E copy "${XcodeDefaultInfo}" "${LLVMToolchainDir}/ToolchainInfo.plist"
     64                   COMMAND /usr/libexec/PlistBuddy -c "Set:Identifier org.llvm.${PACKAGE_VERSION}" "${LLVMToolchainDir}/ToolchainInfo.plist")
     65 
     66 add_custom_target(install-xcode-toolchain
     67                   DEPENDS ${LLVMToolchainDir}/ToolchainInfo.plist
     68                   COMMAND "${CMAKE_COMMAND}" --build ${CMAKE_BINARY_DIR} --target all
     69                   COMMAND "${CMAKE_COMMAND}"
     70                           -DCMAKE_INSTALL_PREFIX=${LLVMToolchainDir}/usr/
     71                           -P "${CMAKE_BINARY_DIR}/cmake_install.cmake"
     72                   ${cmake_3_2_USES_TERMINAL})
     73