Make creating symbolic links of shared objects optional during instal…

…lation. (#69)

Reason: Error message under Windows: "EXEC : CMake error : failed to create symbolic link 'Imath.dll': operation not permitted"
Signed-off-by: Transporter <ogre.transporter@gmail.com>

Co-authored-by: Cary Phillips <cary@ilm.com>

config/ImathSetup.cmake

@@ -34,8 +34,10 @@ set(IMATH_PACKAGE_NAME "Imath ${IMATH_VERSION}" CACHE STRING "Public string / la
 # Whether to generate and install a pkg-config file Imath.pc on
 if(WIN32)
 option(IMATH_INSTALL_PKG_CONFIG "Install Imath.pc file" OFF)
+option(IMATH_INSTALL_SYM_LINK "Create symbolic links for shared objects" OFF)
 else()
 option(IMATH_INSTALL_PKG_CONFIG "Install Imath.pc file" ON)
+option(IMATH_INSTALL_SYM_LINK "Create symbolic links for shared objects" ON)
 endif()
 
 ########################

config/LibraryDefine.cmake

@@ -98,7 +98,7 @@ function(IMATH_DEFINE_LIBRARY libname)
     PUBLIC_HEADER
       DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${IMATH_OUTPUT_SUBDIR}
   )
-  if(BUILD_SHARED_LIBS AND (NOT "${IMATH_LIB_SUFFIX}" STREQUAL ""))
+  if(BUILD_SHARED_LIBS AND (NOT "${IMATH_LIB_SUFFIX}" STREQUAL "") AND IMATH_INSTALL_SYM_LINK)
     set(verlibname ${CMAKE_SHARED_LIBRARY_PREFIX}${libname}${IMATH_LIB_SUFFIX}${CMAKE_SHARED_LIBRARY_SUFFIX})
     set(baselibname ${CMAKE_SHARED_LIBRARY_PREFIX}${libname}${CMAKE_SHARED_LIBRARY_SUFFIX})
     if(WIN32)