SWDEV-425678 - Fix build failure in HIP samples

- Due to file reorg path changes cmake fails at find_package(hip) unless CMAKE_PREFIX_PATH is set explicitly
- Update CMakeLists.txt to set CMAKE_PREFIX_PATH
- Update Readme

Change-Id: Ibdb4419efcdd6583b059a728e48dfdb8f927a48b

samples/0_Intro/bit_extract/CMakeLists.txt

@@ -30,6 +30,14 @@ if(${__HIP_ENABLE_PCH})
   add_definitions(-D__HIP_ENABLE_PCH)
 endif()
 
+if(UNIX)
+  if(NOT DEFINED ROCM_PATH)
+    set(ROCM_PATH "/opt/rocm" CACHE STRING "Default ROCM installation directory.")
+  endif()
+  # Search for rocm in common locations
+  list(APPEND CMAKE_PREFIX_PATH ${ROCM_PATH})
+endif()
+
 # Find hip
 find_package(hip)
 

samples/0_Intro/module_api/CMakeLists.txt

@@ -23,6 +23,15 @@ project(module_api)
 cmake_minimum_required(VERSION 3.10)
 
 include_directories(../../common)
+
+if(UNIX)
+  if(NOT DEFINED ROCM_PATH)
+    set(ROCM_PATH "/opt/rocm" CACHE STRING "Default ROCM installation directory.")
+  endif()
+  # Search for rocm in common locations
+  list(APPEND CMAKE_PREFIX_PATH ${ROCM_PATH})
+endif()
+
 # Find hip
 find_package(hip)
 

samples/0_Intro/module_api_global/CMakeLists.txt

@@ -22,6 +22,14 @@ project(module_api_global)
 
 cmake_minimum_required(VERSION 3.10)
 
+if(UNIX)
+  if(NOT DEFINED ROCM_PATH)
+    set(ROCM_PATH "/opt/rocm" CACHE STRING "Default ROCM installation directory.")
+  endif()
+  # Search for rocm in common locations
+  list(APPEND CMAKE_PREFIX_PATH ${ROCM_PATH})
+endif()
+
 # Find hip
 find_package(hip)
 

samples/0_Intro/square/CMakeLists.txt

@@ -24,6 +24,14 @@ project(square)
 
 cmake_minimum_required(VERSION 3.10)
 
+if(UNIX)
+  if(NOT DEFINED ROCM_PATH)
+    set(ROCM_PATH "/opt/rocm" CACHE STRING "Default ROCM installation directory.")
+  endif()
+  # Search for rocm in common locations
+  list(APPEND CMAKE_PREFIX_PATH ${ROCM_PATH})
+endif()
+
 # create square.cpp
 execute_process(COMMAND sh -c "${CMAKE_PREFIX_PATH}/bin/hipify-perl ../square.cu > ../square.cpp")
 

samples/0_Intro/square/README.md

@@ -20,7 +20,7 @@ $ export HIP_PATH=[MYHIP]
 $ cd ~/hip/samples/0_Intro/square
   mkdir -p build && cd build
 
-  cmake -DCMAKE_PREFIX_PATH=<path/to/rocm> -DHIP_CXX_COMPILER=<path/to/clang> ..
+  cmake ..
   make
 
 $ Building without cmake