Initial removal of all Imath source files and minimal cmake adjustments

IlmBase/CMakeLists.txt

@@ -23,6 +23,28 @@ include(config/ParseConfigure.cmake)
 #set up our project
 project(IlmBase VERSION ${ILMBASE_VERSION} LANGUAGES C CXX)
 
+find_package(Imath QUIET)
+
+if(NOT Imath_FOUND)
+  message("Imath was not found. It is going to be cloned and installed.")
+
+  include(ExternalProject)
+
+  set(EXTERNAL_INSTALL_LOCATION ${CMAKE_BINARY_DIR}/Imath)
+
+  ExternalProject_Add(Imath
+    GIT_REPOSITORY https://github.com/AcademySoftwareFoundation/Imath.git
+    GIT_TAG origin/master
+    CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${EXTERNAL_INSTALL_LOCATION} -DPYTHON=${PYTHON}
+    # Python bindings will be generated for Imath if PYTHON=ON
+    )
+
+  include_directories(${EXTERNAL_INSTALL_LOCATION}/include)
+  link_directories(${EXTERNAL_INSTALL_LOCATION}/lib)
+
+endif()
+
+
 #######################################
 #######################################
 # This declares all the configuration variables visible
@@ -41,10 +63,8 @@ add_subdirectory(config)
 # the libraries
 include(config/LibraryDefine.cmake)
 
-add_subdirectory( Half )
 add_subdirectory( Iex )
 add_subdirectory( IexMath )
-add_subdirectory( Imath )
 add_subdirectory( IlmThread )
 
 # Can't seem to do EXCLUDE_FROM_ALL on the test executables
@@ -54,7 +74,5 @@ include(CTest)
 if(BUILD_TESTING)
   enable_testing()
 
-  add_subdirectory( HalfTest )
   add_subdirectory( IexTest )
-  add_subdirectory( ImathTest )
 endif()