nuttx-apps/tools/WASI-SDK.defs

############################################################################
# apps/tools/WASI-SDK.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.
#
############################################################################

# wasi-sdk toolchain

WCC ?= $(WASI_SDK_PATH)/bin/clang
WAR ?= $(WASI_SDK_PATH)/bin/llvm-ar rcs

# Sysroot for building wasm module, default is NuttX

WSYSROOT ?= $(TOPDIR)

# Force disable wasm build when WCC is not exist

ifeq ($(wildcard $(WCC)),)
  WASM_BUILD = n
else
  WASM_BUILD ?= n
endif

# Force disable wasm build when WASM_SYSROOT is not defined and on specific
# targets that do not support wasm build.
# Since some architecture level inline assembly instructions can not be
# recognized by wasm-clang. For example:
# Error: /github/workspace/sources/nuttx/include/arch/chip/irq.h:220:27: error: invalid output constraint '=a' in asm
# asm volatile("rdtscp" : "=a" (lo), "=d" (hi)::"memory");

ifeq ($(CONFIG_ARCH_INTEL64)$(CONFIG_ARCH_SPARC_V8)$(CONFIG_ARCH_AVR)$(CONFIG_ARCH_XTENSA),y)
  WASM_BUILD = n
endif

# Build optimization flags from scratch

ifeq ($(CONFIG_DEBUG_FULLOPT),y)
  WCFLAGS += -Oz
else ifeq ($(CONFIG_DEBUG_CUSTOMOPT),y)
  WCFLAGS += $(CONFIG_DEBUG_OPTLEVEL)
endif

ifneq ($(CONFIG_LTO_FULL)$(CONFIG_LTO_THIN),)
  WCFLAGS += -flto
  WLDFLAGS += -flto
endif

# Build other compiler flags from native compiler
# Filter out some flags that wasm-clang does not support,
# -m%: Machine flags, -mcpu=, -mfpu=, -mfloat-abi= etc.
# -Wl,%: Extra linker flags, wasm-ld don't support many of them.
# -fsanitize%: -fsanitize=address, -fsanitize=thread etc.
# -fno-sanitize%: -fno-sanitize=address, -fno-sanitize=thread etc.
# -W%: Warning flags, clang is more strict than gcc

CFLAGS_STRIP = -m% -Wl,% -fsanitize% -fno-sanitize% -W%

WCFLAGS += $(filter-out $(CFLAGS_STRIP),$(CFLAGS))
WCFLAGS += --sysroot=$(WSYSROOT) -nostdlib -D__NuttX__

# If CONFIG_LIBM not defined, then define it to 1
ifeq ($(CONFIG_LIBM),)
WCFLAGS += -DCONFIG_LIBM=1 -I$(APPDIR)$(DELIM)include$(DELIM)wasm
endif

WLDFLAGS += -z stack-size=$(STACKSIZE) -Wl,--initial-memory=$(WASM_INITIAL_MEMORY)
WLDFLAGS += -Wl,--export=main -Wl,--export=__main_argc_argv
WLDFLAGS += -Wl,--export=__heap_base -Wl,--export=__data_end
WLDFLAGS += -Wl,--no-entry -Wl,--strip-all -Wl,--allow-undefined

WCC_COMPILER_RT_LIB = $(shell $(WCC) --print-libgcc-file-name)
ifeq ($(wildcard $(WCC_COMPILER_RT_LIB)),)
  # if "--print-libgcc-file-name" unable to find the correct libgcc PATH
  # then go ahead and try "--print-file-name"
  WCC_COMPILER_RT_LIB := $(wildcard $(shell $(WCC) --print-file-name $(notdir $(WCC_COMPILER_RT_LIB))))
endif