Detects AppleClang as Clang

Seems like this has been discussed before: https://github.com/conan-io/cmake-conan/issues/52 , https://github.com/conan-io/cmake-conan/issues/33

Even though they have been marked as resolved, it’s still happening to me right now on version 0.14. Let me know if you need other information and I will happily provide to resolve this issue! 😃

$ cmake .. -DCMAKE_BUILD_TYPE=Release
-- The C compiler identification is AppleClang 10.0.0.10001145
-- The CXX compiler identification is AppleClang 10.0.0.10001145
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Downloading conan.cmake from https://github.com/conan-io/cmake-conan
-- Conan: Automatic detection of conan settings from cmake
In file included from <stdin>:1:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/string:477:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/string_view:176:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/__string:56:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/algorithm:641:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/cstring:61:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/string.h:61:15: fatal error: 'string.h' file not found
#include_next <string.h>
              ^~~~~~~~~~
1 error generated.
-- Conan: Settings= -s;build_type=Release;-s;compiler=clang;-s;compiler.version=10;-s;compiler.libcxx=libc++
-- Conan executing: conan install /Users/mathias/Demo/conanfile.txt -s build_type=Release -s compiler=clang -s compiler.version=10 -s compiler.libcxx=libc++ -g=cmake --build=missing
ERROR: Invalid setting '10' is not a valid 'settings.compiler.version' value.
Possible values are ['3.3', '3.4', '3.5', '3.6', '3.7', '3.8', '3.9', '4.0', '5.0', '6.0', '7.0', '8']
Read "http://docs.conan.io/en/latest/faq/troubleshooting.html#error-invalid-setting"
CMake Error at Build/conan.cmake:399 (message):
  Conan install failed='1'
Call Stack (most recent call first):
  Build/conan.cmake:485 (conan_cmake_install)
  CMakeLists.txt:16 (conan_cmake_run)

[czoido]

This error should be fixed by: https://github.com/conan-io/cmake-conan/pull/226 to be merged in v0.16

[sergeyklay]

Status update.

Setting CMP0025 at the main CMakeLists.txt

cmake_policy(SET CMP0025 NEW)

And exporting SDKROOT

echo "::set-env name=SDKROOT::$(xcodebuild -version -sdk macosx Path)"

Fixes the issue at GitHub Action. But note:

• This is not fixes the issue at my laptop (I have no idea really)
• Using v0.13 on my laptop fixes this issue