cmake: Toolchain abstraction: Abstraction of print memory usage.

The method for getting a memory usage report printed during build, is
based on a GNU linker (ld) option flag, and thus is not necessarily
supported by other toolchain binary tools.
The introduced cmake macro allows for a given toolchain to specify how
the memory usage report is to be generated, and whether the command for
generation, if any, is to be added to the post_build_commands and the
post_build_byproducts lists of the top level CMakeLists.txt

The intent here is to abstract Zephyr's dependence on toolchains,
thus allowing for easier porting to other, perhaps commercial,
toolchains and/or usecases.

No functional change expected.

Signed-off-by: Danny Oerndrup <daor@demant.com>

CMakeLists.txt

@@ -1219,6 +1219,24 @@ if(NOT CONFIG_BUILD_NO_GAP_FILL)
   set(GAP_FILL "--gap-fill;0xff")
 endif()
 
+if(CONFIG_OUTPUT_PRINT_MEMORY_USAGE)
+  # @Intent: Use the toolchain bintools method for printing memory usage
+  set(memUsageCmd    "")
+  set(memUsageByProd "")
+  bintools_print_mem_usage(
+    RESULT_CMD_LIST    memUsageCmd
+    RESULT_BYPROD_LIST memUsageByProd
+  )
+  list(APPEND
+    post_build_commands
+    ${memUsageCmd}
+    )
+  list(APPEND
+    post_build_byproducts
+    ${memUsageByProd}
+    )
+endif()
+
 if(CONFIG_BUILD_OUTPUT_HEX)
   list(APPEND
     post_build_commands
@@ -1358,23 +1376,6 @@ if(HEX_FILES_TO_MERGE)
   list(APPEND FLASH_DEPS mergehex)
 endif()
 
-if(CONFIG_OUTPUT_PRINT_MEMORY_USAGE)
-  # Use --print-memory-usage with the first link.
-  #
-  # Don't use this option with the second link because seeing it twice
-  # could confuse users and using it on the second link would suppress
-  # it when the first link has a ram/flash-usage issue.
-  set(option ${LINKERFLAGPREFIX},--print-memory-usage)
-  string(MAKE_C_IDENTIFIER check${option} check)
-
-  set(SAVED_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
-  set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${option}")
-  zephyr_check_compiler_flag(C "" ${check})
-  set(CMAKE_REQUIRED_FLAGS ${SAVED_CMAKE_REQUIRED_FLAGS})
-
-  target_link_libraries_ifdef(${check} ${ZEPHYR_PREBUILT_EXECUTABLE} ${option})
-endif()
-
 if(EMU_PLATFORM)
   include(${ZEPHYR_BASE}/cmake/emu/${EMU_PLATFORM}.cmake)
 else()

cmake/bintools/gnu/target.cmake

@@ -12,3 +12,6 @@ find_program(CMAKE_NM      ${CROSS_COMPILE}nm      PATH ${TOOLCHAIN_HOME} NO_DEF
 
 find_program(CMAKE_GDB     ${CROSS_COMPILE}gdb     PATH ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
 find_program(CMAKE_GDB     gdb-multiarch           PATH ${TOOLCHAIN_HOME}                )
+
+# Include bin tool abstraction macros
+include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_memusage.cmake)

cmake/bintools/gnu/target_memusage.cmake

@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: Apache-2.0
+
+# Add and/or prepare print of memory usage report
+#
+# Usage:
+#   bintools_print_mem_usage(
+#     RESULT_CMD_LIST    <List of commands to be executed, usually after build>
+#     RESULT_BYPROD_LIST <List of command output byproducts>
+#   )
+#
+macro(bintools_print_mem_usage)
+
+  # Here we make use of the linkers ability to produce memory usage output
+  #  and thus we have no need for the above provided arguments, but another
+  #  toolchain with a different set of binary tools, most likely will...
+  #
+  # Use --print-memory-usage with the first link.
+  #
+  # Don't use this option with the second link because seeing it twice
+  # could confuse users and using it on the second link would suppress
+  # it when the first link has a ram/flash-usage issue.
+  set(option ${LINKERFLAGPREFIX},--print-memory-usage)
+  string(MAKE_C_IDENTIFIER check${option} check)
+
+  set(SAVED_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
+  set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${option}")
+  zephyr_check_compiler_flag(C "" ${check})
+  set(CMAKE_REQUIRED_FLAGS ${SAVED_CMAKE_REQUIRED_FLAGS})
+
+  target_link_libraries_ifdef(${check} ${ZEPHYR_PREBUILT_EXECUTABLE} ${option})
+
+endmacro(bintools_print_mem_usage)

cmake/bintools/host-gnu/target.cmake

@@ -9,3 +9,6 @@ find_program(CMAKE_RANLILB ranlib )
 find_program(CMAKE_READELF readelf)
 
 find_program(CMAKE_GDB     gdb    )
+
+# Use the gnu binutil abstraction macros
+include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_memusage.cmake)

cmake/bintools/llvm/target.cmake

@@ -13,3 +13,6 @@ find_program(CMAKE_OBJDUMP llvm-objdump ${find_program_clang_args}   )
 find_program(CMAKE_RANLIB  llvm-ranlib  ${find_program_clang_args}   )
 find_program(CMAKE_OBJCOPY objcopy      ${find_program_binutils_args})
 find_program(CMAKE_READELF readelf      ${find_program_binutils_args})
+
+# Use the gnu binutil abstraction macros
+include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_memusage.cmake)