Hi all,
I have a very simple CMakeLists.txt – am using cmake 3.1 to be able to easily
request C++ 11 – it works fine on ubuntu but not on MacOS with Xcode 6 and
command line tools installed:
$ cat CMakeLists.txt
cmake_minimum_required(VERSION 3.1)
project("Test1" C CXX)
# We need C++ 11
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED on)
file(WRITE test1.cpp "int main(int argc, char** argv) {auto x=argc; return x;}")
add_executable(test1 test1.cpp)
$ cmake31 .
-- The C compiler identification is AppleClang 6.0.0.6000056
-- The CXX compiler identification is AppleClang 6.0.0.6000056
-- Check for working C compiler:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
-- Check for working C compiler:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
-- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++
-- Check for working CXX compiler:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++
-- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Configuring done
CMake Error in CMakeLists.txt:
Target "test1" requires the language dialect "CXX11" (with compiler
extensions), but CMake does not know the compile flags to use to enable it.
This is with
CXX=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++
CXXFLAGS="-std=c++11"
But same without that
Any idea why Cmake complains and how to not make it complain ?
Help/pointer greatly appreciated
Thanks
Laurent
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