wasm-micro-runtime/build-scripts/warnings.cmake

# Copyright (C) 2019 Intel Corporation.  All rights reserved.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

# global additional warnings.
if (MSVC)
  # warning level 4
  add_compile_options(/W4)
else ()
  # refer to https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
  add_compile_options(
    -Wall -Wextra -Wformat -Wformat-security
     $<$<COMPILE_LANGUAGE:C>:-Wshadow>
  )
  # -pedantic causes warnings like "ISO C forbids initialization between function pointer and ‘void *’" which
  #   is widely used in the codebase.
  #
  # -fpermissive causes warnings like "-fpermissive is valid for C++/ObjC++ but not for C"
  #
  add_compile_options (
    $<$<COMPILE_LANGUAGE:C>:-Wincompatible-pointer-types>
    $<$<COMPILE_LANGUAGE:C>:-Wimplicit-function-declaration>
  )
  # waivers
  add_compile_options (
    -Wno-unused
    -Wno-unused-parameter
  )
endif ()