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30 lines
1.3 KiB
Plaintext
30 lines
1.3 KiB
Plaintext
# tm_gmtoff.m4
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# serial 5
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dnl Copyright (C) 2002, 2009-2024 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl Check for tm_gmtoff and tm_zone in struct tm, and #define
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dnl HAVE_STRUCT_TM_TM_GMTOFF and HAVE_STRUCT_TM_TM_ZONE accordingly.
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dnl Most code that needs one needs the other, so there seemed little
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dnl point to having two macros to check them individually.
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dnl Although all platforms that we know of have either both members or
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dnl neither member, check for the two members separately just in case.
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dnl
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dnl These days this macro is more useful than AC_STRUCT_TIMEZONE, which also
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dnl checks for the obsolescent tzname and does not check for tm_gmtoff.
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AC_DEFUN([gl_TM_GMTOFF],
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[
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AC_CHECK_MEMBERS([struct tm.tm_gmtoff, struct tm.tm_zone], [], [],
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[[#include <time.h>
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]])
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dnl Backward compatibility with 2024-and-earlier versions of this macro.
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AS_IF([test "$ac_cv_member_struct_tm_tm_gmtoff" = yes],
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[AC_DEFINE([HAVE_TM_GMTOFF], [1],
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[Define if struct tm has the tm_gmtoff member.
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This macro is obsolete.
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New code should use HAVE_STRUCT_TM_TM_GMTOFF.])])
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])
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