[libclc] Fix dependencies between targets

We need file-level - not target-level - dependencies for these custom
commands to re-trigger when their dependencies change.

Author: frasercrmck

libclc/CMakeLists.txt

@@ -364,7 +364,7 @@ foreach( t ${LIBCLC_TARGETS_TO_BUILD} )
       set( spv_suffix ${arch_suffix}.spv )
       add_custom_command( OUTPUT ${spv_suffix}
         COMMAND ${LLVM_SPIRV} ${spvflags} -o ${spv_suffix} ${builtins_link_lib}
-        DEPENDS ${builtins_link_lib_tgt}
+        DEPENDS ${builtins_link_lib}
       )
       add_custom_target( "prepare-${spv_suffix}" ALL DEPENDS "${spv_suffix}" )
       install( FILES ${CMAKE_CURRENT_BINARY_DIR}/${spv_suffix}
@@ -376,7 +376,7 @@ foreach( t ${LIBCLC_TARGETS_TO_BUILD} )
       add_custom_command( OUTPUT ${builtins_opt_lib_tgt}.bc
         COMMAND libclc::opt ${opt_flags} -o ${builtins_opt_lib_tgt}.bc
           ${builtins_link_lib}
-        DEPENDS libclc::opt ${builtins_link_lib_tgt}
+        DEPENDS libclc::opt ${builtins_link_lib}
       )
       add_custom_target( ${builtins_opt_lib_tgt}
         ALL DEPENDS ${builtins_opt_lib_tgt}.bc
@@ -385,12 +385,13 @@ foreach( t ${LIBCLC_TARGETS_TO_BUILD} )
         PROPERTIES TARGET_FILE ${builtins_opt_lib_tgt}.bc
       )
 
+      set( builtins_opt_lib $<TARGET_PROPERTY:${builtins_opt_lib_tgt},TARGET_FILE> )
+
       # Add prepare target
       set( obj_suffix ${arch_suffix}.bc )
       add_custom_command( OUTPUT ${obj_suffix}
-        COMMAND prepare_builtins -o ${obj_suffix}
-          $<TARGET_PROPERTY:${builtins_opt_lib_tgt},TARGET_FILE>
-        DEPENDS ${builtins_opt_lib_tgt} prepare_builtins )
+        COMMAND prepare_builtins -o ${obj_suffix} ${builtins_opt_lib}
+        DEPENDS ${builtins_opt_lib} prepare_builtins )
       add_custom_target( prepare-${obj_suffix} ALL DEPENDS ${obj_suffix} )
 
       # nvptx-- targets don't include workitem builtins