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Subject:	Re: problem building with cmake under cygwin (need clang)
To:	cygwin AT cygwin DOT com
References:	<5796B2A7 DOT 8060002 AT molconn DOT com> <00cd1dc9-e9bc-1ae0-4cbd-eb0a72c79e93 AT gmail DOT com> <CAEhDDbD_g+tD3PzW_qcUDA+Y-YB=HV07eWuCPy_ha0n4tE96GQ AT mail DOT gmail DOT com>
From:	Marco Atzeri <marco DOT atzeri AT gmail DOT com>
Message-ID:	<a131bff5-fea2-a515-64d9-e6a4468156f0@gmail.com>
Date:	Tue, 26 Jul 2016 10:45:25 +0200
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On 26/07/2016 09:47, Csaba Raduly wrote:
> On Tue, Jul 26, 2016 at 8:16 AM, Marco Atzeri  wrote:
>>
>>
>>  CMake Error at CMakeLists.txt:22 (message):
>>    Compiler does not support C++1z standard
>>
>> if you look on CMakeLists.txt you will find is expecting a flag
>> as "-std=gnu++1z"  that looks a bit strange for a not gnu compiler
>
> Clang implements many of GCC's extensions. -std=gnu++1something means
> "C++ 1something with GNU extensions". Clang understands that just
> fine.
>
> Csaba
>

may be, but it seems not so in this case

-- Performing Test COMPILER_SUPPORTS_CXX1Z - Failed
CMake Error at CMakeLists.txt:22 (message):
   Compiler does not support C++1z standard

I am skeptical of all this portion
---------------------------------------------------------
CHECK_CXX_COMPILER_FLAG("-stdlib=libc++" COMPILER_SUPPORTS_LIBCXX)
if(NOT COMPILER_SUPPORTS_LIBCXX)
     message(FATAL_ERROR "libc++ not installed or libc++ not supported 
by clang++")
endif()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")

CHECK_CXX_COMPILER_FLAG("-std=gnu++1z" COMPILER_SUPPORTS_CXX1Z)
if(NOT COMPILER_SUPPORTS_CXX1Z)
     message(FATAL_ERROR "Compiler does not support C++1z standard")
endif()
add_compile_options("-std=gnu++1z")
----------------------------------------------------------

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