SWDEV-388833 - Fix potential build issues with gcc tests

Change-Id: I53c109ebaed60b085069d862d87ac8a3597331c5

catch/unit/gcc/CMakeLists.txt

@@ -6,8 +6,10 @@ set(TEST_SRC
     gpu.cpp
 )
 # Creating Custom object file
-add_custom_target(LaunchKernel_custom COMMAND gcc -c ${CMAKE_CURRENT_SOURCE_DIR}/LaunchKernel.c -I${HIP_PATH}/include -D__HIP_PLATFORM_AMD__ -o LaunchKernel.o)
+add_custom_command(OUTPUT LaunchKernel.o COMMAND gcc -c ${CMAKE_CURRENT_SOURCE_DIR}/LaunchKernel.c -I${HIP_PATH}/include -D__HIP_PLATFORM_AMD__ -o LaunchKernel.o)
-add_custom_target(hipMalloc_custom COMMAND gcc -c ${CMAKE_CURRENT_SOURCE_DIR}/hipMalloc.c -I${HIP_PATH}/include -D__HIP_PLATFORM_AMD__ -o hipMalloc.o)
+add_custom_target(LaunchKernel_custom DEPENDS LaunchKernel.o)
+add_custom_command(OUTPUT hipMalloc.o COMMAND gcc -c ${CMAKE_CURRENT_SOURCE_DIR}/hipMalloc.c -I${HIP_PATH}/include -D__HIP_PLATFORM_AMD__ -o hipMalloc.o)
+add_custom_target(hipMalloc_custom DEPENDS hipMalloc.o)
 
 add_library(LaunchKernel_lib OBJECT IMPORTED)
 add_library(hipMalloc_lib OBJECT IMPORTED)