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kconfig: Add symbols for C standard

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Add symbols to select a C standard. Next to an option, hidden symbols
are available to select the minimum.
This allows subsystems or modules to select the least compliant C
standard supported.

Signed-off-by: Pieter De Gendt <pieter.degendt@basalte.be>
This commit is contained in:
Pieter De Gendt 2024-04-03 09:32:10 +02:00 • committed by Fabio Baltieri
commit 86b721c45e
2 changed files with 83 additions and 1 deletions
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19
CMakeLists.txt
View file

@ -957,7 +957,24 @@ if(CONFIG_USERSPACE)
endif()
get_property(CSTD GLOBAL PROPERTY CSTD)
set_ifndef(CSTD c99)
if(NOT DEFINED CSTD)
if(CONFIG_STD_C23)
set(CSTD c2x)
elseif(CONFIG_STD_C17)
set(CSTD c17)
elseif(CONFIG_STD_C11)
set(CSTD c11)
elseif(CONFIG_STD_C99)
set(CSTD c99)
elseif(CONFIG_STD_C90)
set(CSTD c90)
else()
message(FATAL_ERROR "Unreachable code. Expected C standard to have been chosen.")
endif()
else()
message(DEPRECATION
"Global CSTD property is deprecated, see Kconfig.zephyr for C Standard options.")
endif()
# @Intent: Obtain compiler specific flag for specifying the c standard
zephyr_compile_options(

65
Kconfig.zephyr
View file

@ -338,6 +338,71 @@ endmenu
menu "Compiler Options"
config REQUIRES_STD_C99
bool
help
Hidden option to select compiler support C99 standard or higher.
config REQUIRES_STD_C11
bool
select REQUIRES_STD_C99
help
Hidden option to select compiler support C11 standard or higher.
config REQUIRES_STD_C17
bool
select REQUIRES_STD_C11
help
Hidden option to select compiler support C17 standard or higher.
config REQUIRES_STD_C23
bool
select REQUIRES_STD_C17
help
Hidden option to select compiler support C23 standard or higher.
choice STD_C
prompt "C Standard"
default STD_C23 if REQUIRES_STD_C23
default STD_C17 if REQUIRES_STD_C17
default STD_C11 if REQUIRES_STD_C11
default STD_C99
help
C Standards.
config STD_C90
bool "C90"
depends on !REQUIRES_STD_C99
help
1989 C standard as completed in 1989 and ratified by ISO/IEC
as ISO/IEC 9899:1990. This version is known as "ANSI C".
config STD_C99
bool "C99"
depends on !REQUIRES_STD_C11
help
1999 C standard.
config STD_C11
bool "C11"
depends on !REQUIRES_STD_C17
help
2011 C standard.
config STD_C17
bool "C17"
depends on !REQUIRES_STD_C23
help
2017 C standard, addresses defects in C11 without introducing
new language features.
config STD_C23
bool "C23"
help
2023 C standard.
endchoice
config CODING_GUIDELINE_CHECK
bool "Enforce coding guideline rules"
help