build: Add Clang toolchain file for ESP32-H4

tools/cmake/toolchain-clang-esp32h4.cmake

@@ -0,0 +1,32 @@
+include($ENV{IDF_PATH}/tools/cmake/utilities.cmake)
+
+set(CMAKE_SYSTEM_NAME Generic)
+
+set(CMAKE_C_COMPILER clang)
+set(CMAKE_CXX_COMPILER clang++)
+set(CMAKE_ASM_COMPILER clang)
+
+set(CMAKE_AR llvm-ar)
+set(CMAKE_RANLIB llvm-ranlib)
+set(CMAKE_OBJDUMP riscv32-esp-elf-objdump)
+
+remove_duplicated_flags("--target=riscv32-esp-elf -march=rv32imc -mabi=ilp32 \
+                        ${CMAKE_C_FLAGS}"
+                        UNIQ_CMAKE_C_FLAGS)
+set(CMAKE_C_FLAGS "${UNIQ_CMAKE_C_FLAGS}"
+    CACHE STRING "C Compiler Base Flags"
+    FORCE)
+
+remove_duplicated_flags("--target=riscv32-esp-elf -march=rv32imc -mabi=ilp32 \
+                        ${CMAKE_CXX_FLAGS}"
+                        UNIQ_CMAKE_CXX_FLAGS)
+set(CMAKE_CXX_FLAGS "${UNIQ_CMAKE_CXX_FLAGS}"
+    CACHE STRING "C++ Compiler Base Flags"
+    FORCE)
+
+remove_duplicated_flags("--target=riscv32-esp-elf -march=rv32imc -mabi=ilp32 \
+                        ${CMAKE_ASM_FLAGS}"
+                        UNIQ_CMAKE_ASM_FLAGS)
+set(CMAKE_ASM_FLAGS "${UNIQ_CMAKE_ASM_FLAGS}"
+    CACHE STRING "Assembler Base Flags"
+    FORCE)