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zephyr/cmake/compiler/gcc/compiler_flags.cmake
Sylvio Alves c9f6d18dfc soc: esp32: add Espressif HAL config 
Current Espressif porting requires standard include as
part of hal implementation. compiler_flags.cmake checks for
variant name to keep those stdinc in build.
Instead of using variant name as check, use this new CONFIG
to make it clear and to allow having toolchain integrated
in zephyr-sdk package.
stdinc dependency in hal_espressif will be worked out and removed
soon.

Signed-off-by: Sylvio Alves <sylvio.alves@espressif.com>
2022-05-11 10:47:27 +02:00

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CMake
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# Those are flags not to test for CXX compiler.
list(APPEND CXX_EXCLUDED_OPTIONS
-Werror=implicit-int
-Wold-style-definition
-Wno-pointer-sign
)
########################################################
# Setting compiler properties for gcc / g++ compilers. #
########################################################
#####################################################
# This section covers flags related to optimization #
#####################################################
set_compiler_property(PROPERTY no_optimization -O0)
if(CMAKE_C_COMPILER_VERSION VERSION_LESS "4.8.0")
set_compiler_property(PROPERTY optimization_debug -O0)
else()
set_compiler_property(PROPERTY optimization_debug -Og)
endif()
set_compiler_property(PROPERTY optimization_speed -O2)
set_compiler_property(PROPERTY optimization_size -Os)
#######################################################
# This section covers flags related to warning levels #
#######################################################
# GCC Option standard warning base in Zephyr
set_compiler_property(PROPERTY warning_base
-Wall
-Wformat
-Wformat-security
-Wno-format-zero-length
-Wno-main
)
check_set_compiler_property(APPEND PROPERTY warning_base -Wno-pointer-sign)
# Prohibit void pointer arithmetic. Illegal in C99
check_set_compiler_property(APPEND PROPERTY warning_base -Wpointer-arith)
# not portable
check_set_compiler_property(APPEND PROPERTY warning_base -Wexpansion-to-defined)
# GCC options for warning levels 1, 2, 3, when using `-DW=[1|2|3]`
set_compiler_property(PROPERTY warning_dw_1
-Waggregate-return
-Wcast-align
-Wdisabled-optimization
-Wnested-externs
-Wshadow
)
check_set_compiler_property(APPEND PROPERTY warning_dw_1
-Wlogical-op
-Wmissing-field-initializers
)
set_compiler_property(PROPERTY warning_dw_2
-Wbad-function-cast
-Wcast-qual
-Wconversion
-Wpacked
-Wpadded
-Wpointer-arith
-Wredundant-decls
-Wswitch-default
)
check_set_compiler_property(APPEND PROPERTY warning_dw_2
-Wpacked-bitfield-compat
-Wvla
)
set_compiler_property(PROPERTY warning_dw_3
-Wbad-function-cast
-Wcast-qual
-Wconversion
-Wpacked
-Wpadded
-Wpointer-arith
-Wredundant-decls
-Wswitch-default
)
check_set_compiler_property(APPEND PROPERTY warning_dw_3
-Wpacked-bitfield-compat
-Wvla
)
check_set_compiler_property(PROPERTY warning_extended -Wno-unused-but-set-variable)
check_set_compiler_property(PROPERTY warning_error_implicit_int -Werror=implicit-int)
set_compiler_property(PROPERTY warning_error_misra_sane -Werror=vla)
set_compiler_property(PROPERTY warning_error_coding_guideline
-Werror=vla
-Wimplicit-fallthrough=2
-Wconversion
-Woverride-init
)
###########################################################################
# This section covers flags related to C or C++ standards / standard libs #
###########################################################################
# GCC compiler flags for C standard. The specific standard must be appended by user.
set_compiler_property(PROPERTY cstd -std=)
if (NOT CONFIG_NEWLIB_LIBC AND
NOT COMPILER STREQUAL "xcc" AND
NOT CONFIG_HAS_ESPRESSIF_HAL AND
NOT CONFIG_NATIVE_APPLICATION)
set_compiler_property(PROPERTY nostdinc -nostdinc)
set_compiler_property(APPEND PROPERTY nostdinc_include ${NOSTDINC})
endif()
set_compiler_property(TARGET compiler-cpp PROPERTY nostdincxx "-nostdinc++")
# Required C++ flags when using gcc
set_property(TARGET compiler-cpp PROPERTY required "-fcheck-new")
# GCC compiler flags for C++ dialects
set_property(TARGET compiler-cpp PROPERTY dialect_cpp98 "-std=c++98")
set_property(TARGET compiler-cpp PROPERTY dialect_cpp11 "-std=c++11" "-Wno-register")
set_property(TARGET compiler-cpp PROPERTY dialect_cpp14 "-std=c++14" "-Wno-register")
set_property(TARGET compiler-cpp PROPERTY dialect_cpp17 "-std=c++17" "-Wno-register")
set_property(TARGET compiler-cpp PROPERTY dialect_cpp2a "-std=c++2a"
"-Wno-register" "-Wno-volatile")
set_property(TARGET compiler-cpp PROPERTY dialect_cpp20 "-std=c++20"
"-Wno-register" "-Wno-volatile")
set_property(TARGET compiler-cpp PROPERTY dialect_cpp2b "-std=c++2b"
"-Wno-register" "-Wno-volatile")
# Disable exceptions flag in C++
set_property(TARGET compiler-cpp PROPERTY no_exceptions "-fno-exceptions")
# Disable rtti in C++
set_property(TARGET compiler-cpp PROPERTY no_rtti "-fno-rtti")
###################################################
# This section covers all remaining C / C++ flags #
###################################################
# gcc flags for coverage generation
set_compiler_property(PROPERTY coverage -fprofile-arcs -ftest-coverage -fno-inline)
# Security canaries.
set_compiler_property(PROPERTY security_canaries -fstack-protector-all)
# Only a valid option with GCC 7.x and above, so let's do check and set.
check_set_compiler_property(APPEND PROPERTY security_canaries -mstack-protector-guard=global)
if(NOT CONFIG_NO_OPTIMIZATIONS)
# _FORTIFY_SOURCE: Detect common-case buffer overflows for certain functions
# _FORTIFY_SOURCE=1 : Compile-time checks (requires -O1 at least)
# _FORTIFY_SOURCE=2 : Additional lightweight run-time checks
set_compiler_property(PROPERTY security_fortify _FORTIFY_SOURCE=2)
endif()
# gcc flag for a hosted (no-freestanding) application
check_set_compiler_property(APPEND PROPERTY hosted -fno-freestanding)
# gcc flag for a freestanding application
set_compiler_property(PROPERTY freestanding -ffreestanding)
# Flag to enable debugging
set_compiler_property(PROPERTY debug -g)
# GCC 11 by default emits DWARF version 5 which cannot be parsed by
# pyelftools. Can be removed once pyelftools supports v5.
check_set_compiler_property(APPEND PROPERTY debug -gdwarf-4)
set_compiler_property(PROPERTY no_common -fno-common)
# GCC compiler flags for imacros. The specific header must be appended by user.
set_compiler_property(PROPERTY imacros -imacros)
# GCC compiler flags for sanitizing.
set_compiler_property(PROPERTY sanitize_address -fsanitize=address)
set_compiler_property(PROPERTY gprof -pg)
set_compiler_property(PROPERTY sanitize_undefined -fsanitize=undefined)
# GCC compiler flag for turning off thread-safe initialization of local statics
set_property(TARGET compiler-cpp PROPERTY no_threadsafe_statics "-fno-threadsafe-statics")
# Required ASM flags when using gcc
set_property(TARGET asm PROPERTY required "-xassembler-with-cpp")
# gcc flag for colourful diagnostic messages
if (NOT COMPILER STREQUAL "xcc")
set_compiler_property(PROPERTY diagnostic -fdiagnostics-color=always)
endif()
# Compiler flag for disabling pointer arithmetic warnings
set_compiler_property(PROPERTY warning_no_pointer_arithmetic "-Wno-pointer-arith")
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