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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>
From:	Marco Atzeri <marco DOT atzeri AT gmail DOT com>
Message-ID:	<00cd1dc9-e9bc-1ae0-4cbd-eb0a72c79e93@gmail.com>
Date:	Tue, 26 Jul 2016 08:16:02 +0200
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On 26/07/2016 02:45, LMH wrote:
> Hello,
>
> I am trying to compute the convex hull of a high dimensional space (46D
> x 2000 rows). The qhull app available in cygwin/math is based on
> relatively old code and runs out of memory.
>
> I found another version the is supposed to be able to do higher dimensions.
>
> https://bitbucket.org/tomilov/quickhull/src
>
> This version is set up to build with cmake, so I installed cmake in
> cygwin and ran it as,
>
> cmake ./src
>
> Note, I had to copy CMakeLists.txt into the src directory to get this to
> work. If I don't do that, I get the error,
>
> CMake Error: The source directory
> "/cygdrive/g/shared_data/SMD/ATomilov_quickhull/tomilov-quickhull-7faf277d6cc2_cmake/src"
> does not appear to contain CMakeLists.txt.
>
> When I have copied the CMakeLists.txt file into ./src, cmake runs but I
> get the error,
>
> CMake Error at CMakeLists.txt:11 (message):
>   only clang supported currently
>
> this comes from the conditional,
>
> if(NOT "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
>     message(FATAL_ERROR "only clang supported currently")
> endif()
>
> in CMakeLists.txt.
>
> I have installed clang from cygwin, but I still get the same error. I
> added the following line to CMakeLists.txt,
>
> message(STATUS "${CMAKE_CXX_COMPILER_ID}")
>
> and I get "GNU" as the value for CMAKE_CXX_COMPILER_ID, at least that is
> the value if I got the syntax correct for the message statement.
>
> It looks like I need to point CMAKE_CXX_COMPILER_ID to clang, but I am
> not sure how to do that. I don't know if the problem is with the
> CMakeLists.txt file, the way I am calling cmake, or with my local cygwin
> configuration.
>
> Suggestions would be appreciated.
>
> LMH
>
>


the build system of quickhull has some serious problem.

set

CMAKE_CXX_COMPILER               /usr/bin/clang-3.8.exe
CMAKE_C_COMPILER                 /usr/bin/clang-3.8.exe

after you will hit

  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

I you want to build this program on cygwin, you need to learn
a bit of cmake and debug the CMakeLists wrong assumptions

Regards
Marco





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