使用gcc编译器模板

build/BUILDCONFIG.gn

@@ -2,6 +2,34 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+
+
+
+# board_toolchain 用于定义使用的编译工具链
+# 这个值可以取 gcc riscv-gcc
+
+
+if (!defined(board_toolchain)){
+  board_toolchain="gcc"
+}
+
+if (board_toolchain=="riscv-gcc"){
+  current_cc_command = "riscv64-unknown-elf-gcc"
+  current_cxx_command = "riscv64-unknown-elf-g++"
+  current_ar_command = "riscv64-unknown-elf-ar"
+  current_ld_command = current_cc_command
+  current_strip_command =
+      "riscv64-unknown-elf-strip --strip-unneeded"
+} else if (board_toolchain=="gcc"){
+  current_cc_command = "gcc"
+  current_cxx_command = "g++"
+  current_ar_command = "ar"
+  current_ld_command = current_cc_command
+  current_strip_command =
+      "strip --strip-unneeded"
+}
+
+
 if (target_os == "") {
   target_os = host_os
 }
@@ -38,4 +66,4 @@ set_defaults("source_set") {
   configs = _shared_binary_target_configs
 }
 
-set_default_toolchain("//build/toolchain:gcc")
+set_default_toolchain("//build/toolchain:${board_toolchain}")