Use linker scripts instead of symlink. (#472)

* Use linker scripts instead of symlink.

* Use same VERSION and SOVERSION

Since Python (or dlopen) is not able to follow chained linker scripts
set both properties to be the same, and use one linker script for .so
file which redirectes to .so.MAJOR.MINOR

* Execute linker script on Unix only

Co-authored-by: Oleksandr Pavlyk <oleksandr.pavlyk@intel.com>

Author: Diptorup Deb

dpctl-capi/CMakeLists.txt

@@ -147,24 +147,36 @@ target_link_libraries(DPCTLSyclInterface
     PRIVATE ${IntelSycl_OPENCL_LIBRARY}
 )
 
+include(GetProjectVersion)
+# the get_version function is defined in the GetProjectVersion module and
+# defines: VERSION, SEMVER, MAJOR, MINOR, PATCH. These variables are populated
+# by parsing the output of git describe.
+get_version()
+set_target_properties(DPCTLSyclInterface
+    PROPERTIES
+        VERSION ${VERSION_MAJOR}.${VERSION_MINOR}
+        SOVERSION ${VERSION_MAJOR}.${VERSION_MINOR}
+)
+
+if(UNIX)
+    set(linker_script1
+        "INPUT(libDPCTLSyclInterface.so.${VERSION_MAJOR}.${VERSION_MINOR})"
+    )
+    add_custom_command(TARGET DPCTLSyclInterface POST_BUILD
+        COMMAND "${CMAKE_COMMAND}" -E remove "libDPCTLSyclInterface.so"
+        COMMAND "${CMAKE_COMMAND}"
+            -E echo "${linker_script1}" > "libDPCTLSyclInterface.so"
+        VERBATIM
+    )
+endif()
+
 if(DPCTL_ENABLE_LO_PROGRAM_CREATION)
     target_include_directories(DPCTLSyclInterface
         PRIVATE
         ${LEVEL_ZERO_INCLUDE_DIR}
     )
 endif()
 
-# FIXME: Turning off for release until conda build can be packaging symbolic links
-# NOTE: Till we hit 1.0.0 we will keep using the MINOR version to set the API
-# version of the library.
-# include(GetProjectVersion)
-# the get_version function is defined in the GetProjectVersion module and
-# defines: VERSION, SEMVER, MAJOR, MINOR, PATCH. These variables are populated
-# by parsing the output of git describe.
-# get_version()
-# set_target_properties(DPCTLSyclInterface PROPERTIES VERSION ${VERSION_MINOR})
-# set_target_properties(DPCTLSyclInterface PROPERTIES SOVERSION 1)
-
 install(TARGETS
     DPCTLSyclInterface
     LIBRARY