initial commit

third_party/tinyusb/examples/build_system/cmake/toolchain/common.cmake

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+include(CMakePrintHelpers)
+
+# ----------------------------------------------------------------------------
+# Common
+# ----------------------------------------------------------------------------
+set(CMAKE_SYSTEM_NAME Generic)
+set(CMAKE_SYSTEM_PROCESSOR ${CMAKE_SYSTEM_CPU})
+set_property(GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS FALSE)
+
+# Look for includes and libraries only in the target system prefix.
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+
+# pass TOOLCHAIN_CPU to
+set(CMAKE_TRY_COMPILE_PLATFORM_VARIABLES CMAKE_SYSTEM_PROCESSOR CMAKE_SYSTEM_CPU)
+include(${CMAKE_CURRENT_LIST_DIR}/../cpu/${CMAKE_SYSTEM_CPU}.cmake)
+
+# ----------------------------------------------------------------------------
+# Compile flags
+# ----------------------------------------------------------------------------
+set(TOOLCHAIN_C_FLAGS)
+set(TOOLCHAIN_ASM_FLAGS)
+set(TOOLCHAIN_EXE_LINKER_FLAGS)
+
+if (TOOLCHAIN STREQUAL "gcc" OR TOOLCHAIN STREQUAL "clang")
+  list(APPEND TOOLCHAIN_COMMON_FLAGS
+    -fdata-sections
+    -ffunction-sections
+#    -fsingle-precision-constant # not supported by clang
+    -fno-strict-aliasing
+    -g # include debug info for bloaty
+    )
+  set(TOOLCHAIN_EXE_LINKER_FLAGS "-Wl,--print-memory-usage -Wl,--gc-sections -Wl,--cref")
+
+  if (TOOLCHAIN STREQUAL clang)
+    set(TOOLCHAIN_ASM_FLAGS "-x assembler-with-cpp")
+  endif ()
+elseif (TOOLCHAIN STREQUAL "iar")
+  set(TOOLCHAIN_C_FLAGS --debug)
+  set(TOOLCHAIN_EXE_LINKER_FLAGS --diag_suppress=Li065)
+endif ()
+
+# join the toolchain flags into a single string
+list(JOIN TOOLCHAIN_COMMON_FLAGS " " TOOLCHAIN_COMMON_FLAGS)
+
+set(CMAKE_C_FLAGS_INIT "${TOOLCHAIN_COMMON_FLAGS} ${TOOLCHAIN_C_FLAGS}")
+set(CMAKE_CXX_FLAGS_INIT "${TOOLCHAIN_COMMON_FLAGS} ${TOOLCHAIN_C_FLAGS}")
+set(CMAKE_ASM_FLAGS_INIT "${TOOLCHAIN_COMMON_FLAGS} ${TOOLCHAIN_ASM_FLAGS}")
+set(CMAKE_EXE_LINKER_FLAGS_INIT ${TOOLCHAIN_EXE_LINKER_FLAGS})