[llvm-bugs] [Bug 25677] New: cmake build system fails on Leopard due to preference of macosx.internal SDK in compiler-rt

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25677

            Bug ID: 25677
           Summary: cmake build system fails on Leopard due to preference
                    of macosx.internal SDK in compiler-rt
           Product: Build scripts
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: cmake
          Assignee: unassignedbugs at nondot.org
          Reporter: jeremyhu at apple.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Leopard's final Xcode version (3.1.4) has a bug whereby executing 'xcodebuild
-version -sdk macosx.internal' will spin.  This is done as part of the
cmake-based build system which prevents the build from happening:

$ pstree -w 00479
-+- 00479 macports sh -c  cd
"/opt/local/var/macports/build/_Users_jeremy_src_macports_dports_jeremyhu_lang_llvm-3.8/clang-3.8/work/build"
&& /opt/local/bin/cmake -DCMAKE_INSTALL_PREFIX=/opt/local
-DCMAKE_OSX_ARCHITECTURES="x86_64;i386" -DCMAKE_VERBOSE_MAKEFILE=ON
-DCMAKE_COLOR_MAKEFILE=ON -DCMAKE_BUILD_TYPE=Debug
-DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DCMAKE_INSTALL_RPATH=/opt/local/lib
-DCMAKE_INSTALL_NAME_DIR=/opt/local/lib
-DCMAKE_SYSTEM_PREFIX_PATH="/opt/local;/usr"
-DCMAKE_MODULE_PATH=/opt/local/share/cmake/Modules -DCMAKE_FIND_FRAMEWORK=LAST
-Wno-dev -DLLVM_BUILD_LLVM_DYLIB=ON
-DCMAKE_INSTALL_PREFIX="/opt/local/libexec/llvm-3.8" -DLLVM_ENABLE_RTTI=ON
-DLLVM_INCLUDE_TESTS=OFF -DLLVM_INCLUDE_EXAMPLES=OFF -DLLVM_ENABLE_FFI=ON
-DFFI_INCLUDE_DIR=/opt/local/include -DFFI_LIBRARY_DIR=/opt/local/lib
-DCLANG_INCLUDE_TESTS=OFF -DLLVM_BUILD_RUNTIME=ON -DLIBCXX_INSTALL_LIBRARY=OFF
-DLIBCXX_ENABLE_SHARED=OFF -DLLVM_ENABLE_BACKTRACES=OFF
-DLLVM_ENABLE_ASSERTIONS=ON -DCLANG_ENABLE_STATIC_ANALYZER=ON
-DCMAKE_C_FLAGS_RELEASE="-DNDEBUG" -DCMAKE_CXX_FLAGS_RELEASE="-DNDEBUG"
-DCMAKE_OSX_DEPLOYMENT_TARGET="10.5" -DCMAKE_OSX_SYSROOT="/" ../trunk 
 \-+- 00485 macports /opt/local/bin/cmake -DCMAKE_INSTALL_PREFIX=/opt/local
-DCMAKE_OSX_ARCHITECTURES=x86_64;i386 -DCMAKE_VERBOSE_MAKEFILE=ON
-DCMAKE_COLOR_MAKEFILE=ON -DCMAKE_BUILD_TYPE=Debug
-DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DCMAKE_INSTALL_RPATH=/opt/local/lib
-DCMAKE_INSTALL_NAME_DIR=/opt/local/lib
-DCMAKE_SYSTEM_PREFIX_PATH=/opt/local;/usr
-DCMAKE_MODULE_PATH=/opt/local/share/cmake/Modules -DCMAKE_FIND_FRAMEWORK=LAST
-Wno-dev -DLLVM_BUILD_LLVM_DYLIB=ON
-DCMAKE_INSTALL_PREFIX=/opt/local/libexec/llvm-3.8 -DLLVM_ENABLE_RTTI=ON
-DLLVM_INCLUDE_TESTS=OFF -DLLVM_INCLUDE_EXAMPLES=OFF -DLLVM_ENABLE_FFI=ON
-DFFI_INCLUDE_DIR=/opt/local/include -DFFI_LIBRARY_DIR=/opt/local/lib
-DCLANG_INCLUDE_TESTS=OFF -DLLVM_BUILD_RUNTIME=ON -DLIBCXX_INSTALL_LIBRARY=OFF
-DLIBCXX_ENABLE_SHARED=OFF -DLLVM_ENABLE_BACKTRACES=OFF
-DLLVM_ENABLE_ASSERTIONS=ON -DCLANG_ENABLE_STATIC_ANALYZER=ON
-DCMAKE_C_FLAGS_RELEASE=-DNDEBUG -DCMAKE_CXX_FLAGS_RELEASE=-DNDEBUG
-DCMAKE_OSX_DEPLOYMENT_TARGET=10.5 -DCMAKE_OSX_SYSROOT=/ ../trunk
   \--- 00524 macports /Developer/usr/bin/xcodebuild -version -sdk
macosx.internal Path

This seems to be coming from
projects/compiler-rt/cmake/Modules/CompilerRTDarwinUtils.cmake:

function(find_darwin_sdk_dir var sdk_name)
  # Let's first try the internal SDK, otherwise use the public SDK.
  execute_process(
    COMMAND xcodebuild -version -sdk ${sdk_name}.internal Path
    OUTPUT_VARIABLE var_internal
    OUTPUT_STRIP_TRAILING_WHITESPACE
    ERROR_FILE /dev/null
  )
  if("" STREQUAL "${var_internal}")
    execute_process(
      COMMAND xcodebuild -version -sdk ${sdk_name} Path
      OUTPUT_VARIABLE var_internal
      OUTPUT_STRIP_TRAILING_WHITESPACE
      ERROR_FILE /dev/null
    )
  endif()
  set(${var} ${var_internal} PARENT_SCOPE)
endfunction()

It would be good to conditionalize that to only execute on Snow Leopard and
later.

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