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zephyr/cmake/compiler/gcc/compiler_flags.cmake
Carles Cufi 892ac07a4a cmake: Add a new no_deprecation_warning compiler flag 
Commit be40d854c2ccacf14ca3fcfb01bffdc9b075c6c9 introduced the ability
of building Zephyr with deprecation warnings enabled, by making
COMPILER_WARNINGS_AS_ERRORS depend on the newly added DEPRECATION_TEST
Kconfig option. This has the downside of disabling **all** warnings, not
only the deprecation ones.

This patch instead makes DEPRECATION_TEST disable only the deprecation
warning, but leaves COMPILER_WARNINGS_AS_ERRORS enabled.
This has the advantage of being able to see other unrelated warnings
(and fail if they appear) but has the disadvantage of not printing out
the deprecation warnings themselves (since they are disabled).

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
2025-06-23 12:38:07 -07:00

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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)
set_compiler_property(PROPERTY optimization_size_aggressive -Oz)
set_compiler_property(PROPERTY optimization_fast -Ofast)
if(CMAKE_C_COMPILER_VERSION GREATER_EQUAL "4.5.0")
set_compiler_property(PROPERTY optimization_lto -flto=auto)
set_compiler_property(PROPERTY prohibit_lto -fno-lto)
endif()
#######################################################
# This section covers flags related to warning levels #
#######################################################
# GCC Option standard warning base in Zephyr
check_set_compiler_property(PROPERTY warning_base
-Wall
"SHELL:-Wformat -Wformat-security"
"SHELL:-Wformat -Wno-format-zero-length"
)
# C implicit promotion rules will want to make floats into doubles very easily
check_set_compiler_property(APPEND PROPERTY warning_base -Wdouble-promotion)
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
-Wno-missing-field-initializers
)
set_compiler_property(PROPERTY warning_dw_2
-Wbad-function-cast
-Wcast-qual
-Wconversion
-Wpacked
-Wpadded
-Wpointer-arith
-Wredundant-decls
-Wswitch-default
-Wmissing-field-initializers
)
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 (CONFIG_PICOLIBC AND NOT CONFIG_PICOLIBC_USE_MODULE) AND
NOT COMPILER STREQUAL "xcc" AND
NOT COMPILER STREQUAL "xt-clang" AND
NOT CONFIG_HAS_ESPRESSIF_HAL AND
NOT CONFIG_NATIVE_BUILD)
set_compiler_property(PROPERTY nostdinc -nostdinc)
set_compiler_property(APPEND PROPERTY nostdinc_include ${NOSTDINC})
endif()
check_set_compiler_property(PROPERTY no_printf_return_value -fno-printf-return-value)
set_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++ dialect: "register" variables and some
# "volatile" usage generates warnings by default in standard versions
# higher than 17 and 20 respectively. Zephyr uses both, so turn off
# the warnings where needed (but only on the compilers that generate
# them, older toolchains like xcc don't understand the command line
# flags!)
set_property(TARGET compiler-cpp PROPERTY dialect_cpp98 "-std=c++98")
set_property(TARGET compiler-cpp PROPERTY dialect_cpp11 "-std=c++11")
set_property(TARGET compiler-cpp PROPERTY dialect_cpp14 "-std=c++14")
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")
# Flag for disabling strict aliasing rule in C and C++
set_compiler_property(PROPERTY no_strict_aliasing -fno-strict-aliasing)
# Extra warning options
set_property(TARGET compiler PROPERTY warnings_as_errors -Werror)
set_property(TARGET asm PROPERTY warnings_as_errors -Werror -Wa,--fatal-warnings)
# Deprecation warning
set_property(TARGET compiler PROPERTY no_deprecation_warning -Wno-deprecated-declarations)
set_property(TARGET asm PROPERTY no_deprecation_warning -Wno-deprecated-declarations)
# 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)
set_compiler_property(PROPERTY security_canaries_strong -fstack-protector-strong)
set_compiler_property(PROPERTY security_canaries_all -fstack-protector-all)
set_compiler_property(PROPERTY security_canaries_explicit -fstack-protector-explicit)
# Only a valid option with GCC 7.x and above, so let's do check and set.
if(CONFIG_STACK_CANARIES_TLS)
check_set_compiler_property(APPEND PROPERTY security_canaries -mstack-protector-guard=tls)
check_set_compiler_property(APPEND PROPERTY security_canaries_strong -mstack-protector-guard=tls)
check_set_compiler_property(APPEND PROPERTY security_canaries_all -mstack-protector-guard=tls)
check_set_compiler_property(APPEND PROPERTY security_canaries_explicit -mstack-protector-guard=tls)
else()
check_set_compiler_property(APPEND PROPERTY security_canaries -mstack-protector-guard=global)
check_set_compiler_property(APPEND PROPERTY security_canaries_global -mstack-protector-guard=global)
check_set_compiler_property(APPEND PROPERTY security_canaries_all -mstack-protector-guard=global)
check_set_compiler_property(APPEND PROPERTY security_canaries_explicit -mstack-protector-guard=global)
endif()
if(NOT CONFIG_NO_OPTIMIZATIONS)
# _FORTIFY_SOURCE: Detect common-case buffer overflows for certain functions
# _FORTIFY_SOURCE=1 : Loose checking (use wide bounds checks)
# _FORTIFY_SOURCE=2 : Tight checking (use narrow bounds checks)
# GCC always does compile-time bounds checking for string/mem functions, so
# there's no additional value to set here
set_compiler_property(PROPERTY security_fortify_compile_time)
set_compiler_property(PROPERTY security_fortify_run_time _FORTIFY_SOURCE=2)
endif()
check_set_compiler_property(PROPERTY sanitizer_undefined -fsanitize=undefined)
check_set_compiler_property(PROPERTY sanitizer_undefined_trap -fsanitize-undefined-trap-on-error)
check_set_compiler_property(PROPERTY sanitizer_undefined_library)
# gcc flag for a hosted (no-freestanding) application
check_set_compiler_property(APPEND PROPERTY hosted -fno-freestanding)
# gcc flag for a freestanding application
check_set_compiler_property(PROPERTY freestanding -ffreestanding)
# Flag to enable debugging
set_compiler_property(PROPERTY debug -g)
# Flags to save temporary object files
set_compiler_property(PROPERTY save_temps -save-temps=obj)
# Flag to specify linker script
set_compiler_property(PROPERTY linker_script -T)
# Flags to not track macro expansion
set_compiler_property(PROPERTY no_track_macro_expansion -ftrack-macro-expansion=0)
# 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)
set_compiler_property(PROPERTY gprof -pg)
# 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 compiler flags for imacros. The specific header must be appended by user.
set_property(TARGET asm PROPERTY imacros "-imacros")
# gcc flag for colourful diagnostic messages
check_set_compiler_property(PROPERTY diagnostic -fdiagnostics-color=always)
# Compiler flag for disabling pointer arithmetic warnings
set_compiler_property(PROPERTY warning_no_pointer_arithmetic "-Wno-pointer-arith")
#Compiler flags for disabling position independent code / executable
set_compiler_property(PROPERTY no_position_independent
-fno-pic
-fno-pie
)
set_compiler_property(PROPERTY no_global_merge "")
set_compiler_property(PROPERTY warning_shadow_variables -Wshadow)
set_compiler_property(PROPERTY warning_no_array_bounds -Wno-array-bounds)
set_compiler_property(PROPERTY no_builtin -fno-builtin)
set_compiler_property(PROPERTY no_builtin_malloc -fno-builtin-malloc)
set_compiler_property(PROPERTY specs -specs=)
set_compiler_property(PROPERTY include_file -include)
set_compiler_property(PROPERTY cmse -mcmse)
set_property(TARGET asm PROPERTY cmse -mcmse)
# Compiler flag for not placing functions in their own sections:
set_compiler_property(PROPERTY no_function_sections "-fno-function-sections")
# Compiler flag for not placing variables in their own sections:
set_compiler_property(PROPERTY no_data_sections "-fno-data-sections")
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