# 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"
#
# Reference:
# - gcc-4.8 https://gcc.gnu.org/onlinedocs/gcc-4.8.4/gcc/Warning-Options.html
# - gcc-11.5 https://gcc.gnu.org/onlinedocs/gcc-11.5.0/gcc/Warning-Options.html
add_compile_options (
$<$<COMPILE_LANGUAGE:C>:-Wimplicit-function-declaration>
)
# https://gcc.gnu.org/gcc-5/changes.html introduces incompatible-pointer-types
# https://releases.llvm.org/7.0.0/tools/clang/docs/DiagnosticsReference.html#wincompatible-pointer-types
# is the earliest version that supports this option I can found.
# Assume AppClang versioning is compatible with Clang.
if ((CMAKE_C_COMPILER_ID STREQUAL "GNU" AND CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL "5.1")
OR (CMAKE_C_COMPILER_ID STREQUAL "Clang" AND CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL "7.0.0")
OR (CMAKE_C_COMPILER_ID STREQUAL "AppClang" AND CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL "7.0.0"))
add_compile_options($<$<COMPILE_LANGUAGE:C>:-Wincompatible-pointer-types>)
endif()
# options benefit embedded system.
add_compile_options (
-Wdouble-promotion
)
# waivers
add_compile_options (
-Wno-unused
-Wno-unused-parameter
)
endif ()