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libc: remove POSIX_TIMERS dep from COMMON_LIBC_TIME #92590

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Merged
merged 2 commits into from
Jul 8, 2025
Merged

libc: remove POSIX_TIMERS dep from COMMON_LIBC_TIME #92590

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00036ea
libc: remove POSIX_TIMERS dep from COMMON_LIBC_TIME
maass-hamburg Jul 3, 2025
6c89f48
docs: replace clock_gettime
maass-hamburg Jul 3, 2025
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2 changes: 1 addition & 1 deletion cmake/toolchain/armclang/Kconfig
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Expand Up @@ -16,7 +16,7 @@ choice LIBC_IMPLEMENTATION
config ARMCLANG_STD_LIBC
bool "ARM Compiler C library"
select COMMON_LIBC_STRNLEN
select COMMON_LIBC_TIME if POSIX_TIMERS
select COMMON_LIBC_TIME
help
Use the full Arm Compiler runtime libraries.
A reduced Zephyr minimal libc will be used for library functionality
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2 changes: 1 addition & 1 deletion doc/develop/languages/c/common_libc.rst
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Expand Up @@ -12,7 +12,7 @@ Time function
*************

This provides an implementation of the standard C function, :c:func:`time`,
relying on the Zephyr function, :c:func:`clock_gettime`. This function can
relying on the Zephyr function, :c:func:`sys_clock_gettime`. This function can
be enabled by selecting :kconfig:option:`COMMON_LIBC_TIME`.

Dynamic Memory Management
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5 changes: 1 addition & 4 deletions lib/libc/minimal/Kconfig
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Expand Up @@ -37,7 +37,7 @@ config MINIMAL_LIBC_RAND

config MINIMAL_LIBC_TIME
bool "Time functions"
select COMMON_LIBC_TIME if POSIX_TIMERS
select COMMON_LIBC_TIME
select POSIX_C_LANG_SUPPORT_R
select COMMON_LIBC_GMTIME_R
select COMMON_LIBC_ASCTIME
Expand All @@ -47,9 +47,6 @@ config MINIMAL_LIBC_TIME
help
Enable time() and gmtime_r() for the minimal libc.

time() requires CONFIG_POSIX_TIMERS=y because it relies on the POSIX
clock_gettime() function.

In order to make use of the non-reentrant gmtime(), it is necessary
to set CONFIG_MINIMAL_LIBC_NON_REENTRANT_FUNCTIONS=y.

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