DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:subject:to:references:from:message-id:date
	:mime-version:in-reply-to:content-type
	:content-transfer-encoding; q=dns; s=default; b=UsRqjZUCb62/v++1
	5o5BkniYDzX0ClOSUcIgI+Acy6IoFLfxa7NhnoWWkcHs1gU5lvr6awr4oQLxRskY
	erNh7C8iY3FB2IP7vl1BY+6JNiotWEUQ0U5b/XegUj4Op/RxA5agBF4MRtjDZwCo
	LS650NoBd7UXpzg64joh2WaS1KY=
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
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
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0
MIME-Version: 1.0
In-Reply-To: <5796B2A7.8060002@molconn.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit


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


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple