Re: [Plplot-devel] Spurious warnings on Cygwin should now be gone

[Arjen M. <Arj...@de...>]

Hi Alan,



With this minimal CMakeLists.txt file:



function(plplot_cmake_minimum_required)

  cmake_minimum_required(${ARGV})

endfunction(plplot_cmake_minimum_required)



plplot_cmake_minimum_required(VERSION 3.0.2 FATAL_ERROR)



I get the following output:

-- The C compiler identification is GNU 4.9.2
-- The CXX compiler identification is GNU 4.9.2
CMake Warning at /usr/share/cmake-3.1.2/Modules/Platform/CYGWIN.cmake:15 (message):
  CMake no longer defines WIN32 on Cygwin!

  (1) If you are just trying to build this project, ignore this warning or
  quiet it by setting CMAKE_LEGACY_CYGWIN_WIN32=0 in your environment or in
  the CMake cache.  If later configuration or build errors occur then this
  project may have been written under the assumption that Cygwin is WIN32.
  In that case, set CMAKE_LEGACY_CYGWIN_WIN32=1 instead.

  (2) If you are developing this project, add the line

    set(CMAKE_LEGACY_CYGWIN_WIN32 0) # Remove when CMake >= 2.8.4 is required

  at the top of your top-level CMakeLists.txt file or set the minimum
  required version of CMake to 2.8.4 or higher.  Then teach your project to
  build on Cygwin without WIN32.
Call Stack (most recent call first):
  /usr/share/cmake-3.1.2/Modules/CMakeSystemSpecificInformation.cmake:36 (include)



-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++.exe
-- Check for working CXX compiler: /usr/bin/c++.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /cygdrive/d/tmp/cmake

Whereas calling cmake_minimum_required directly does not produce the message.

When I checked this statement however, I found it is possible to reduce the CmakeLists.txt file even further:

cmake_minimum_required(VERSION 3.0.2 FATAL_ERROR)

with nothing else, that is, not followed by project(), will print the same messages. I think that this is why cmake_minimum_required() in a function does produce the messages.

Regards,

Arjen




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