Prevent the literal string DEBUG from being appended to some messages…

… in CMake < 3.15

Fixes issue raspberrypi#422

cmake/preload/toolchains/pico_arm_gcc.cmake

@@ -12,7 +12,7 @@ if (NOT PICO_GCC_TRIPLE)
         message("PICO_GCC_TRIPLE set from environment: $ENV{PICO_GCC_TRIPLE}")
     else()
         set(PICO_GCC_TRIPLE arm-none-eabi)
-        message(DEBUG "PICO_GCC_TRIPLE defaulted to arm-none-eabi")
+        message_debug("PICO_GCC_TRIPLE defaulted to arm-none-eabi")
     endif()
 endif()
 

pico_sdk_init.cmake

@@ -18,6 +18,15 @@ if (NOT TARGET _pico_sdk_pre_init_marker)
         endif()
     endfunction()
 
+    function(message_debug MESSAGE)
+        # The log-level system was added in CMake 3.15.
+        if(${CMAKE_VERSION} VERSION_LESS "3.15.0")
+            message(${MESSAGE})
+        else()
+            message(DEBUG ${MESSAGE})
+        endif()
+    endfunction()
+
     if (NOT PICO_SDK_PATH)
         set(PICO_SDK_PATH ${CMAKE_CURRENT_LIST_DIR})
     endif ()
@@ -49,14 +58,14 @@ if (NOT TARGET _pico_sdk_pre_init_marker)
     macro(add_sub_list_dirs var)
         foreach(LIST_DIR IN LISTS ${var})
             get_filename_component(SHORT_NAME "${LIST_DIR}" NAME)
-            message(DEBUG "Including custom CMakeLists.txt ${SHORT_NAME}")
+            message_debug("Including custom CMakeLists.txt ${SHORT_NAME}")
             add_subdirectory(${LIST_DIR} ${SHORT_NAME})
         endforeach()
     endmacro()
 
     macro(add_sub_list_files var)
         foreach(LIST_FILE IN LISTS ${var})
-            message(DEBUG "Including custom CMake file ${LIST_FILE}")
+            message_debug("Including custom CMake file ${LIST_FILE}")
             include(${LIST_FILE})
         endforeach()
     endmacro()

tools/FindELF2UF2.cmake

@@ -22,7 +22,7 @@ if (NOT ELF2UF2_FOUND)
     set(ELF2UF2_TARGET ELF2UF2)
 
     if (NOT TARGET ${ELF2UF2_BUILD_TARGET})
-        message(DEBUG "ELF2UF2 will need to be built")
+        message_debug("ELF2UF2 will need to be built")
         ExternalProject_Add(${ELF2UF2_BUILD_TARGET}
                 PREFIX elf2uf2 SOURCE_DIR ${ELF2UF2_SOURCE_DIR}
                 BINARY_DIR ${ELF2UF2_BINARY_DIR}

tools/FindPioasm.cmake

@@ -22,7 +22,7 @@ if (NOT Pioasm_FOUND)
     set(Pioasm_TARGET Pioasm)
 
     if (NOT TARGET ${PioasmBuild_TARGET})
-        message(DEBUG "PIOASM will need to be built")
+        message_debug("PIOASM will need to be built")
 #        message("Adding external project ${PioasmBuild_Target} in ${CMAKE_CURRENT_LIST_DIR}}")
         ExternalProject_Add(${PioasmBuild_TARGET}
                 PREFIX pioasm SOURCE_DIR ${PIOASM_SOURCE_DIR}