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From:	LMH <lmh_users-groups AT molconn DOT com>
Subject:	problem building with cmake under cygwin (need clang)
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Date:	Mon, 25 Jul 2016 20:45:27 -0400
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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





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