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sd-common: add __const__

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const is stronger than pure, see
https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-pure-function-attribute
and
https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-const-function-attribute.

(cherry picked from commit 955c51c087f1fb6d0b7a0091db943ad05ba3095e)
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2024-10-28 09:13:10 +01:00 committed by Luca Boccassi
parent 963171cf41
commit a5e128ca26
1 changed files with 4 additions and 0 deletions
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4
src/systemd/_sd-common.h
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@ -45,6 +45,10 @@ typedef void (*_sd_destroy_t)(void *userdata);
# define _sd_pure_ __attribute__((__pure__))
#endif
#ifndef _sd_const_
# define _sd_const_ __attribute__((__const__))
#endif
/* Note that strictly speaking __deprecated__ has been available before GCC 6. However, starting with GCC 6
* it also works on enum values, which we are interested in. Since this is a developer-facing feature anyway
* (as opposed to build engineer-facing), let's hence conditionalize this to gcc 6, given that the developers