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libs/libc/time: Add tzset() for builds without time zones.

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POSIX requires tzset(), but NuttX declared and defined it only with
CONFIG_LIBC_LOCALTIME, so programs that call it do not build without
that option.  Without CONFIG_LIBC_LOCALTIME there are no time zones and
local time is UTC, so tzset() has nothing to do.

Declare tzset() always, and add an empty one for builds without
CONFIG_LIBC_LOCALTIME.

Assisted-by: Claude Code:claude-opus-5-5
Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>
This commit is contained in:
Marco Casaroli 2026-10-08 22:01:33 +02:00 • committed by Xiang Xiao
parent 7942d18fd5
commit 314348cafe
4 changed files with 48 additions and 4 deletions
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2
include/time.h
View file

@ -237,9 +237,7 @@ int clock_nanosleep(clockid_t clockid, int flags,
FAR struct timespec *rmtp);
int nanosleep(FAR const struct timespec *rqtp, FAR struct timespec *rmtp);
#ifdef CONFIG_LIBC_LOCALTIME
void tzset(void);
#endif
#undef EXTERN
#if defined(__cplusplus)

2
libs/libc/time/CMakeLists.txt
View file

@ -41,7 +41,7 @@ set(SRCS
if(CONFIG_LIBC_LOCALTIME)
list(APPEND SRCS lib_localtime.c)
else()
list(APPEND SRCS lib_timegm.c lib_gmtime.c lib_gmtimer.c)
list(APPEND SRCS lib_timegm.c lib_gmtime.c lib_gmtimer.c lib_tzset.c)
endif()
if(CONFIG_ALLOW_MIT_COMPONENTS)

2
libs/libc/time/Make.defs
View file

@ -31,7 +31,7 @@ CSRCS += lib_gethrtime.c
ifdef CONFIG_LIBC_LOCALTIME
CSRCS += lib_localtime.c
else
CSRCS += lib_timegm.c lib_gmtime.c lib_gmtimer.c
CSRCS += lib_timegm.c lib_gmtime.c lib_gmtimer.c lib_tzset.c
endif
ifdef CONFIG_ALLOW_MIT_COMPONENTS

46
libs/libc/time/lib_tzset.c Normal file
View file

@ -0,0 +1,46 @@
/****************************************************************************
* libs/libc/time/lib_tzset.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <time.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: tzset
*
* Description:
* Set up the time zone from the TZ environment variable. Without
* CONFIG_LIBC_LOCALTIME there are no time zones (local time is UTC), so
* there is nothing to set up. The function exists because POSIX
* requires it and portable programs call it.
*
****************************************************************************/
void tzset(void)
{
}