find_program vis CMAKE_EXECUTABLE_SUFFIX

CMakeLists.txt

cmake_minimum_required(VERSION 3.19)

get_property(cmake_role GLOBAL PROPERTY CMAKE_ROLE)

if(CMAKE_ROLE STREQUAL "PROJECT")
  project(dummy LANGUAGES NONE)
endif()

# --- create test script
set(name "hello")
set(stem ${CMAKE_CURRENT_SOURCE_DIR}/${name})
if(WIN32)
  set(suffix .bat)
else()
  set(suffix .sh)
endif()
set(fn ${stem}${suffix})

if(NOT EXISTS ${fn})
  message(STATUS "write ${fn}")
  file(WRITE ${fn} "echo \"hello\"")
  file(CHMOD ${fn} FILE_PERMISSIONS OWNER_READ OWNER_EXECUTE)
endif()

# --- find test script
if(CMAKE_ROLE STREQUAL "PROJECT")
  list(APPEND CMAKE_EXECUTABLE_SUFFIX ${suffix})
  message(STATUS "CMAKE_EXECUTABLE_SUFFIX: ${CMAKE_EXECUTABLE_SUFFIX}")
else()
  string(APPEND name ${suffix})
endif()

find_program(scr
NAMES ${name}
PATHS ${CMAKE_CURRENT_SOURCE_DIR}
NO_DEFAULT_PATH
REQUIRED
)

message(STATUS "script found: ${scr}")