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zephyr/cmake/compiler/gcc/compiler_flags.cmake
Flavio Ceolin d16c5b9048 kernel: canaries: Allow using TLS to store it 
Add new option to use thread local storage for stack
canaries. This makes harder to find the canaries location
and value. This is made optional because there is
a performance and size penalty when using it.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
2023-08-08 19:08:04 -04:00

227 lines
8.5 KiB
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
check_set_compiler_property(PROPERTY warning_base
-Wall
"SHELL:-Wformat -Wformat-security"
"SHELL:-Wformat -Wno-format-zero-length"
)
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 (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_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++ 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 : Compile-time checks (requires -O1 at least)
# _FORTIFY_SOURCE=2 : Additional lightweight run-time checks
set_compiler_property(PROPERTY security_fortify_compile_time _FORTIFY_SOURCE=1)
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 "")
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