tools: Export LLVM style arch info for non-c language

Current Toolchain.defs set the compile flags directly, it's OK for
target specified gcc toolchain.

But some LLVM based toolchains (Rust/Zig etc) use single toolchain to handle all supported paltform.

In this patch, arch level Toolchain.defs export standard LLVM style arch flags, and let <Lang>.defs to map them into internal style,

This will simplify the intergration of non-c language.

Signed-off-by: Huang Qi <huangqi3@xiaomi.com>

tools/Zig.defs

@@ -0,0 +1,69 @@
+############################################################################
+# tools/Zig.defs
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ZIG := zig
+
+ifeq ($(CONFIG_ARCH_RISCV),y)
+
+  ZIGFLAGS := -target $(LLVM_ARCHTYPE)-freestanding-none
+
+  # Detect cpu ISA support flags for risc-v
+
+  ifeq ($(CONFIG_ARCH_RV_ISA_M),y)
+    ZARCHRVISAM := +m
+  endif
+
+  ifeq ($(CONFIG_ARCH_RV_ISA_A),y)
+    ZARCHRVISAA := +a
+  endif
+
+  ifeq ($(CONFIG_ARCH_RV_ISA_C),y)
+    ZARCHRVISAC := +c
+  endif
+
+  ifeq ($(CONFIG_ARCH_FPU),y)
+    ZARCHRVISAF := +f
+  endif
+
+  ifeq ($(CONFIG_ARCH_DPFPU),y)
+    ZARCHRVISAD := +d
+  endif
+
+  ZIGFLAGS += -mcpu generic$(ZARCHRVISAM)$(ZARCHRVISAA)$(ZARCHRVISAF)$(ZARCHRVISAD)$(ZARCHRVISAC)
+  ZIGFLAGS += -mcmodel=medium
+
+else ifeq ($(CONFIG_ARCH_ARM),y)
+
+  ifeq ($(CONFIG_ARM_THUMB),y)
+    ZIGFLAGS := -target thumb-freestanding-$(LLVM_ABITYPE)
+  else
+    ZIGFLAGS := -target arm-freestanding-$(LLVM_ABITYPE)
+  endif
+
+  # Convert cortex-xxx to cortex_xxx for zig
+  ZIGFLAGS += -mcpu $(subst -,_,$(LLVM_CPUTYPE))
+
+else ifeq ($(CONFIG_ARCH_SIM),y)
+  ifeq ($(CONFIG_SIM_M32),y)
+    ZIGFLAGS := -target x86-freestanding-gnu
+  else
+    ZIGFLAGS := -target x86_64-freestanding-gnu
+  endif
+endif