[ 423: Non RHEL building ] (#424)

Fixes #423

### Summarize your change.
Have removed the blocking of trying to build on non-RHEL distro and
changed to only use lib64 on RHEL distros.

### Describe the reason for the change.
Unable to build on eg. Ubuntu

### Describe what you have tested and on which operating system.
Have tested with Ubuntu 20.04 using a custom build of Qt5 (and rest is
standard repo packages)

### Add a list of changes, and note any that might need special
attention during the review.
Have not (yet) tested on a RHEL distro, but have made changes that
differentiate between RHEL and non-RHEL Linux distros

---------

Signed-off-by: Jimmy Christensen <[email protected]>
Co-authored-by: Bernard Laberge <[email protected]>

Author: lithorus

cmake/defaults/rv_targets.cmake

@@ -112,8 +112,6 @@ ELSEIF(UNIX)
     SET(RV_TARGET_IS_RHEL${RHEL_VERSION_MAJOR}
         BOOL TRUE "Detected a Redhat Entreprise Linux OS"
     )
-  ELSE()
-    MESSAGE(FATAL_ERROR "Unknown or unsupported Linux distribution version; stopping configuration!")
   ENDIF()
 ELSEIF(WIN32)
   MESSAGE(STATUS "Building RV for Microsoft Windows")

cmake/dependencies/dav1d.cmake

@@ -28,11 +28,17 @@ SET(_install_dir
 SET(_include_dir
     ${_install_dir}/include
 )
-IF(RV_TARGET_LINUX)
+IF(RHEL_VERBOSE)
+  SET(_lib_dir_name
+      lib64
+  )
   SET(_lib_dir
       ${_install_dir}/lib64
   )
 ELSE()
+  SET(_lib_dir_name
+      lib
+  )
   SET(_lib_dir
       ${_install_dir}/lib
   )
@@ -81,7 +87,7 @@ EXTERNALPROJECT_ADD(
   INSTALL_DIR ${_install_dir}
   URL ${_download_url}
   URL_MD5 ${_download_hash}
-  CONFIGURE_COMMAND ${_configure_command} ./_build --default-library=${_default_library} --prefix=${_install_dir} -Denable_tests=false -Denable_tools=false
+  CONFIGURE_COMMAND ${_configure_command} ./_build --libdir=${_lib_dir_name} --default-library=${_default_library} --prefix=${_install_dir} -Denable_tests=false -Denable_tools=false
   BUILD_COMMAND ${_make_command} -C _build
   INSTALL_COMMAND ${_make_command} -C _build install
   COMMAND ${CMAKE_COMMAND} -E copy_directory ${_lib_dir} ${RV_STAGE_LIB_DIR}

cmake/dependencies/glew.cmake

@@ -27,7 +27,7 @@ SET(_install_dir
     ${RV_DEPS_BASE_DIR}/${_target}/install
 )
 
-IF(RV_TARGET_LINUX)
+IF(RHEL_VERBOSE)
   SET(_lib_dir
       ${_install_dir}/lib64
   )
@@ -74,7 +74,7 @@ EXTERNALPROJECT_ADD(
   DOWNLOAD_DIR ${RV_DEPS_DOWNLOAD_DIR}
   CONFIGURE_COMMAND cd auto && ${_make_command}
   BUILD_COMMAND ${_make_command} -j${_cpu_count} GLEW_DEST=${_install_dir}
-  INSTALL_COMMAND ${_make_command} install GLEW_DEST=${_install_dir}
+  INSTALL_COMMAND ${_make_command} install LIBDIR=${_lib_dir} GLEW_DEST=${_install_dir}
   BUILD_IN_SOURCE TRUE
   BUILD_ALWAYS FALSE
   BUILD_BYPRODUCTS ${_glew_lib}

cmake/dependencies/imath.cmake

@@ -72,7 +72,7 @@ ELSEIF(RV_TARGET_WINDOWS)
   )
 ENDIF()
 
-IF(RV_TARGET_LINUX)
+IF(RHEL_VERBOSE)
   SET(_lib_dir
       ${_install_dir}/lib64
   )

cmake/dependencies/ocio.cmake

@@ -72,7 +72,7 @@ IF(RV_TARGET_WINDOWS)
       "${RV_DEPS_OCIO_DIST_DIR}/lib"
   )
 ENDIF()
-IF(RV_TARGET_LINUX)
+IF(RHEL_VERBOSE)
   SET(_ociolib_dir
       "${RV_DEPS_OCIO_DIST_DIR}/lib64"
   )

cmake/dependencies/openexr.cmake

@@ -31,7 +31,7 @@ SET(${_target}_ROOT_DIR
     ${_install_dir}
 )
 
-IF(RV_TARGET_LINUX)
+IF(RHEL_VERBOSE)
   SET(_lib_dir
       ${_install_dir}/lib64
   )

cmake/dependencies/spdlog.cmake

@@ -31,7 +31,7 @@ SET(_include_dir
     ${_install_dir}/include
 )
 
-IF(RV_TARGET_LINUX)
+IF(RHEL_VERBOSE)
   SET(_lib_dir
       ${_install_dir}/lib64
   )

cmake/dependencies/yaml-cpp.cmake

@@ -23,7 +23,7 @@ ELSE()
   )
 ENDIF()
 
-IF(RV_TARGET_LINUX)
+IF(RHEL_VERBOSE)
   SET(_lib_dir
       ${RV_DEPS_OCIO_DIST_DIR}/lib64
   )

cmake/macros/rv_create_std_deps_vars.cmake

@@ -33,7 +33,7 @@ MACRO(RV_CREATE_STANDARD_DEPS_VARIABLES target_name version make_command configu
   SET(_source_dir
       ${_base_dir}/src
   )
-  IF(RV_TARGET_LINUX)
+  IF(RHEL_VERBOSE)
     SET(_lib_dir
         ${_install_dir}/lib64
     )