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zephyr/cmake/compiler/gcc/compiler_flags.cmake

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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)
set_compiler_property(PROPERTY optimization_size_aggressive -Oz)
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 CONFIG_HAS_ESPRESSIF_HAL AND
NOT CONFIG_NATIVE_BUILD)
set_compiler_property(PROPERTY nostdinc -nostdinc)
set_compiler_property(APPEND PROPERTY nostdinc_include ${NOSTDINC})
endif()
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)
# 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.
if(CONFIG_STACK_CANARIES_TLS)
check_set_compiler_property(APPEND PROPERTY security_canaries -mstack-protector-guard=tls)
else()
check_set_compiler_property(APPEND PROPERTY security_canaries -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()
# 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 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")
#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 no_builtin -fno-builtin)
set_compiler_property(PROPERTY no_builtin_malloc -fno-builtin-malloc)
set_compiler_property(PROPERTY specs -specs=)
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