On Tue, Jul 26, 2016 at 8:16 AM, Marco Atzeri wrote: > > 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
Clang implements many of GCC's extensions. -std=gnu++1something means "C++ 1something with GNU extensions". Clang understands that just fine. Csaba -- GCS a+ e++ d- C++ ULS$ L+$ !E- W++ P+++$ w++$ tv+ b++ DI D++ 5++ The Tao of math: The numbers you can count are not the real numbers. Life is complex, with real and imaginary parts. "Ok, it boots. Which means it must be bug-free and perfect. " -- Linus Torvalds "People disagree with me. I just ignore them." -- Linus Torvalds -- 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
