1# Those are flags not to test for CXX compiler.
2list(APPEND CXX_EXCLUDED_OPTIONS
3  -Werror=implicit-int
4  -Wold-style-definition
5  -Wno-pointer-sign
6)
7
8########################################################
9# Setting compiler properties for gcc / g++ compilers. #
10########################################################
11
12#####################################################
13# This section covers flags related to optimization #
14#####################################################
15set_compiler_property(PROPERTY no_optimization -O0)
16if(CMAKE_C_COMPILER_VERSION VERSION_LESS "4.8.0")
17  set_compiler_property(PROPERTY optimization_debug -O0)
18else()
19  set_compiler_property(PROPERTY optimization_debug -Og)
20endif()
21set_compiler_property(PROPERTY optimization_speed -O2)
22set_compiler_property(PROPERTY optimization_size  -Os)
23set_compiler_property(PROPERTY optimization_size_aggressive -Oz)
24
25if(CMAKE_C_COMPILER_VERSION GREATER_EQUAL "4.5.0")
26  set_compiler_property(PROPERTY optimization_lto -flto=auto)
27  set_compiler_property(PROPERTY prohibit_lto -fno-lto)
28endif()
29
30#######################################################
31# This section covers flags related to warning levels #
32#######################################################
33
34# GCC Option standard warning base in Zephyr
35check_set_compiler_property(PROPERTY warning_base
36    -Wall
37    "SHELL:-Wformat -Wformat-security"
38    "SHELL:-Wformat -Wno-format-zero-length"
39)
40
41# C implicit promotion rules will want to make floats into doubles very easily
42check_set_compiler_property(APPEND PROPERTY warning_base -Wdouble-promotion)
43
44check_set_compiler_property(APPEND PROPERTY warning_base -Wno-pointer-sign)
45
46# Prohibit void pointer arithmetic. Illegal in C99
47check_set_compiler_property(APPEND PROPERTY warning_base -Wpointer-arith)
48
49# not portable
50check_set_compiler_property(APPEND PROPERTY warning_base -Wexpansion-to-defined)
51
52# GCC options for warning levels 1, 2, 3, when using `-DW=[1|2|3]`
53set_compiler_property(PROPERTY warning_dw_1
54                      -Waggregate-return
55                      -Wcast-align
56                      -Wdisabled-optimization
57                      -Wnested-externs
58                      -Wshadow
59)
60check_set_compiler_property(APPEND PROPERTY warning_dw_1
61                            -Wlogical-op
62                            -Wno-missing-field-initializers
63)
64
65set_compiler_property(PROPERTY warning_dw_2
66                      -Wbad-function-cast
67                      -Wcast-qual
68                      -Wconversion
69                      -Wpacked
70                      -Wpadded
71                      -Wpointer-arith
72                      -Wredundant-decls
73                      -Wswitch-default
74                      -Wmissing-field-initializers
75)
76check_set_compiler_property(APPEND PROPERTY warning_dw_2
77                            -Wpacked-bitfield-compat
78                            -Wvla
79)
80set_compiler_property(PROPERTY warning_dw_3
81                      -Wbad-function-cast
82                      -Wcast-qual
83                      -Wconversion
84                      -Wpacked
85                      -Wpadded
86                      -Wpointer-arith
87                      -Wredundant-decls
88                      -Wswitch-default
89)
90check_set_compiler_property(APPEND PROPERTY warning_dw_3
91                            -Wpacked-bitfield-compat
92                            -Wvla
93)
94
95check_set_compiler_property(PROPERTY warning_extended -Wno-unused-but-set-variable)
96
97check_set_compiler_property(PROPERTY warning_error_implicit_int -Werror=implicit-int)
98
99set_compiler_property(PROPERTY warning_error_misra_sane -Werror=vla)
100
101set_compiler_property(PROPERTY warning_error_coding_guideline
102                      -Werror=vla
103                      -Wimplicit-fallthrough=2
104                      -Wconversion
105                      -Woverride-init
106)
107
108###########################################################################
109# This section covers flags related to C or C++ standards / standard libs #
110###########################################################################
111
112# GCC compiler flags for C standard. The specific standard must be appended by user.
113set_compiler_property(PROPERTY cstd -std=)
114
115if (NOT CONFIG_NEWLIB_LIBC AND
116    NOT (CONFIG_PICOLIBC AND NOT CONFIG_PICOLIBC_USE_MODULE) AND
117    NOT COMPILER STREQUAL "xcc" AND
118    NOT CONFIG_HAS_ESPRESSIF_HAL AND
119    NOT CONFIG_NATIVE_BUILD)
120  set_compiler_property(PROPERTY nostdinc -nostdinc)
121  set_compiler_property(APPEND PROPERTY nostdinc_include ${NOSTDINC})
122endif()
123
124set_compiler_property(PROPERTY no_printf_return_value -fno-printf-return-value)
125
126set_property(TARGET compiler-cpp PROPERTY nostdincxx "-nostdinc++")
127
128# Required C++ flags when using gcc
129set_property(TARGET compiler-cpp PROPERTY required "-fcheck-new")
130
131# GCC compiler flags for C++ dialect: "register" variables and some
132# "volatile" usage generates warnings by default in standard versions
133# higher than 17 and 20 respectively.  Zephyr uses both, so turn off
134# the warnings where needed (but only on the compilers that generate
135# them, older toolchains like xcc don't understand the command line
136# flags!)
137set_property(TARGET compiler-cpp PROPERTY dialect_cpp98 "-std=c++98")
138set_property(TARGET compiler-cpp PROPERTY dialect_cpp11 "-std=c++11")
139set_property(TARGET compiler-cpp PROPERTY dialect_cpp14 "-std=c++14")
140set_property(TARGET compiler-cpp PROPERTY dialect_cpp17 "-std=c++17" "-Wno-register")
141set_property(TARGET compiler-cpp PROPERTY dialect_cpp2a "-std=c++2a"
142  "-Wno-register" "-Wno-volatile")
143set_property(TARGET compiler-cpp PROPERTY dialect_cpp20 "-std=c++20"
144  "-Wno-register" "-Wno-volatile")
145set_property(TARGET compiler-cpp PROPERTY dialect_cpp2b "-std=c++2b"
146  "-Wno-register" "-Wno-volatile")
147
148# Flag for disabling strict aliasing rule in C and C++
149set_compiler_property(PROPERTY no_strict_aliasing -fno-strict-aliasing)
150
151# Extra warning options
152set_property(TARGET compiler PROPERTY warnings_as_errors -Werror)
153set_property(TARGET asm PROPERTY warnings_as_errors -Werror -Wa,--fatal-warnings)
154
155# Disable exceptions flag in C++
156set_property(TARGET compiler-cpp PROPERTY no_exceptions "-fno-exceptions")
157
158# Disable rtti in C++
159set_property(TARGET compiler-cpp PROPERTY no_rtti "-fno-rtti")
160
161
162###################################################
163# This section covers all remaining C / C++ flags #
164###################################################
165
166# gcc flags for coverage generation
167set_compiler_property(PROPERTY coverage -fprofile-arcs -ftest-coverage -fno-inline)
168
169# Security canaries.
170set_compiler_property(PROPERTY security_canaries -fstack-protector)
171set_compiler_property(PROPERTY security_canaries_strong -fstack-protector-strong)
172set_compiler_property(PROPERTY security_canaries_all -fstack-protector-all)
173set_compiler_property(PROPERTY security_canaries_explicit -fstack-protector-explicit)
174
175# Only a valid option with GCC 7.x and above, so let's do check and set.
176if(CONFIG_STACK_CANARIES_TLS)
177  check_set_compiler_property(APPEND PROPERTY security_canaries -mstack-protector-guard=tls)
178  check_set_compiler_property(APPEND PROPERTY security_canaries_strong -mstack-protector-guard=tls)
179  check_set_compiler_property(APPEND PROPERTY security_canaries_all -mstack-protector-guard=tls)
180  check_set_compiler_property(APPEND PROPERTY security_canaries_explicit -mstack-protector-guard=tls)
181else()
182  check_set_compiler_property(APPEND PROPERTY security_canaries -mstack-protector-guard=global)
183  check_set_compiler_property(APPEND PROPERTY security_canaries_global -mstack-protector-guard=global)
184  check_set_compiler_property(APPEND PROPERTY security_canaries_all -mstack-protector-guard=global)
185  check_set_compiler_property(APPEND PROPERTY security_canaries_explicit -mstack-protector-guard=global)
186endif()
187
188
189if(NOT CONFIG_NO_OPTIMIZATIONS)
190  # _FORTIFY_SOURCE: Detect common-case buffer overflows for certain functions
191  # _FORTIFY_SOURCE=1 : Loose checking (use wide bounds checks)
192  # _FORTIFY_SOURCE=2 : Tight checking (use narrow bounds checks)
193  # GCC always does compile-time bounds checking for string/mem functions, so
194  # there's no additional value to set here
195  set_compiler_property(PROPERTY security_fortify_compile_time)
196  set_compiler_property(PROPERTY security_fortify_run_time _FORTIFY_SOURCE=2)
197endif()
198
199# gcc flag for a hosted (no-freestanding) application
200check_set_compiler_property(APPEND PROPERTY hosted -fno-freestanding)
201
202# gcc flag for a freestanding application
203check_set_compiler_property(PROPERTY freestanding -ffreestanding)
204
205# Flag to enable debugging
206set_compiler_property(PROPERTY debug -g)
207
208# Flags to save temporary object files
209set_compiler_property(PROPERTY save_temps -save-temps=obj)
210
211# Flag to specify linker script
212set_compiler_property(PROPERTY linker_script -T)
213
214# Flags to not track macro expansion
215set_compiler_property(PROPERTY no_track_macro_expansion -ftrack-macro-expansion=0)
216
217# GCC 11 by default emits DWARF version 5 which cannot be parsed by
218# pyelftools. Can be removed once pyelftools supports v5.
219check_set_compiler_property(APPEND PROPERTY debug -gdwarf-4)
220
221set_compiler_property(PROPERTY no_common -fno-common)
222
223# GCC compiler flags for imacros. The specific header must be appended by user.
224set_compiler_property(PROPERTY imacros -imacros)
225
226set_compiler_property(PROPERTY gprof -pg)
227
228# GCC compiler flag for turning off thread-safe initialization of local statics
229set_property(TARGET compiler-cpp PROPERTY no_threadsafe_statics "-fno-threadsafe-statics")
230
231# Required ASM flags when using gcc
232set_property(TARGET asm PROPERTY required "-xassembler-with-cpp")
233
234# gcc flag for colourful diagnostic messages
235if (NOT COMPILER STREQUAL "xcc")
236set_compiler_property(PROPERTY diagnostic -fdiagnostics-color=always)
237endif()
238
239# Compiler flag for disabling pointer arithmetic warnings
240set_compiler_property(PROPERTY warning_no_pointer_arithmetic "-Wno-pointer-arith")
241
242#Compiler flags for disabling position independent code / executable
243set_compiler_property(PROPERTY no_position_independent
244                      -fno-pic
245                      -fno-pie
246)
247
248set_compiler_property(PROPERTY no_global_merge "")
249
250set_compiler_property(PROPERTY warning_shadow_variables -Wshadow)
251
252set_compiler_property(PROPERTY no_builtin -fno-builtin)
253set_compiler_property(PROPERTY no_builtin_malloc -fno-builtin-malloc)
254
255set_compiler_property(PROPERTY specs -specs=)
256
257set_compiler_property(PROPERTY include_file -include)
258