Warnings on Arch Linux

[xyproto]

Hi,

Thanks for creating Glitter. I support the idea of making OpenGL easier to start with for beginners!

When following the instructions on Arch Linux, there are quite a few warnings. Adding cmake .. -Wno-dev to the build instructions may have the potential to make beginners less confused.

Best regards,
Alexander F. Rødseth

-- The C compiler identification is GNU 10.2.0
-- The CXX compiler identification is GNU 10.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
-- Using X11 for window creation
-- Found X11: /usr/include   
-- Looking for XOpenDisplay in /usr/lib/libX11.so;/usr/lib/libXext.so
-- Looking for XOpenDisplay in /usr/lib/libX11.so;/usr/lib/libXext.so - found
-- Looking for gethostbyname
-- Looking for gethostbyname - found
-- Looking for connect
-- Looking for connect - found
-- Looking for remove
-- Looking for remove - found
-- Looking for shmat
-- Looking for shmat - found
-- Looking for IceConnectionNumber in ICE
-- Looking for IceConnectionNumber in ICE - found
-- Shared libraries disabled
-- Looking for ZLIB...
-- Found PkgConfig: /usr/bin/pkg-config (found version "1.7.3") 
-- Checking for module 'zzip-zlib-config'
--   Package 'zzip-zlib-config', required by 'virtual:world', not found
-- Found ZLIB: optimized;/usr/lib/libz.so;debug;/usr/lib/libz.so
-- Checking for module 'minizip'
--   Found minizip, version 1.2.11
CMake Warning (dev) at /usr/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:424 (message):
  The package name passed to `find_package_handle_standard_args` (rt) does
  not match the name of the calling package (RT).  This can lead to problems
  in calling code that expects `find_package` result variables (e.g.,
  `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  Glitter/Vendor/assimp/cmake-modules/FindRT.cmake:19 (find_package_handle_standard_args)
  Glitter/Vendor/assimp/code/CMakeLists.txt:1037 (FIND_PACKAGE)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found rt: /usr/lib/librt.so  
-- Enabled importer formats: AMF 3DS AC ASE ASSBIN B3D BVH COLLADA DXF CSM HMP IRRMESH IRR LWO LWS M3D MD2 MD3 MD5 MDC MDL NFF NDO OFF OBJ OGRE OPENGEX PLY MS3D COB BLEND IFC XGL FBX Q3D Q3BSP RAW SIB SMD STL TERRAGEN 3D X X3D GLTF 3MF MMD
-- Disabled importer formats:
-- Enabled exporter formats: OBJ OPENGEX PLY 3DS ASSBIN ASSXML M3D COLLADA FBX STL X X3D GLTF 3MF ASSJSON STEP
-- Disabled exporter formats:
CMake Deprecation Warning at Glitter/Vendor/bullet/CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


Linux
CMake Warning (dev) at /usr/share/cmake-3.19/Modules/FindOpenGL.cmake:293 (message):
  Policy CMP0072 is not set: FindOpenGL prefers GLVND by default when
  available.  Run "cmake --help-policy CMP0072" for policy details.  Use the
  cmake_policy command to set the policy and suppress this warning.

  FindOpenGL found both a legacy GL library:

    OPENGL_gl_LIBRARY: /usr/lib/libGL.so

  and GLVND libraries for OpenGL and GLX:

    OPENGL_opengl_LIBRARY: /usr/lib/libOpenGL.so
    OPENGL_glx_LIBRARY: /usr/lib/libGLX.so

  OpenGL_GL_PREFERENCE has not been set to "GLVND" or "LEGACY", so for
  compatibility with CMake 3.10 and below the legacy GL library will be used.
Call Stack (most recent call first):
  Glitter/Vendor/bullet/CMakeLists.txt:287 (FIND_PACKAGE)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found OpenGL: /usr/lib/libOpenGL.so   
OPENGL FOUND
/usr/lib/libGL.so/usr/lib/libGLU.so
-- Configuring done
-- Generating done
-- Build files have been written to: /home/alexander/clones/glitter/Build

[kengregson]

Assuming GLVND is actually preferred, CMP0072 warning may be addressed by adding the following to the top level CMakeLists.txt:
set(OPENGL_GL_PREFERENCE GLVND)

[oboff]

Assuming GLVND is actually preferred, CMP0072 warning may be addressed by adding the following to the top level CMakeLists.txt: set(OPENGL_GL_PREFERENCE GLVND)

set(OpenGL_GL_PREFERENCE GLVND) worked for me. Mind the casing of OpenGL.