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annotate m4/sys_time_h.m4 @ 12563:21ecefd9dc81

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headers: make check of system header explicit Exploiting knowledge of internal behavior of other macros can be dangerous, especially since AC_CHECK_HEADERS_ONCE is designed to be cheap on subsequent use. * m4/netdb_h.m4 (gl_HEADER_NETDB): Don't exploit knowledge of gl_CHECK_NEXT_HEADER internals, but call AC_CHECK_HEADERS_ONCE ourselves. * m4/search_h.m4 (gl_SEARCH_H): Likewise. * m4/sys_select_h.m4 (gl_HEADER_SYS_SELECT): Likewise. * m4/sys_time_h.m4 (gl_HEADER_SYS_TIME_H_BODY): Likewise. * m4/inttypes.m4 (gl_INTTYPES_H): Likewise, for gt_INTTYPES_PRI internals. * m4/wchar.m4 (gl_WCHAR_H): Skip followup test if header is missing. Suggested by Bruno Haible. Signed-off-by: Eric Blake <ebb9@byu.net>
author Eric Blake <ebb9@byu.net>
date Thu, 31 Dec 2009 16:20:15 -0700
parents c2cbabec01dd
children aaa284caae61
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1 # Configure a replacement for <sys/time.h>.
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2 # serial 2
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3
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4 # Copyright (C) 2007, 2009, 2010 Free Software Foundation, Inc.
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5 # This file is free software; the Free Software Foundation
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6 # gives unlimited permission to copy and/or distribute it,
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7 # with or without modifications, as long as this notice is preserved.
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8
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9 # Written by Paul Eggert and Martin Lambers.
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11 AC_DEFUN([gl_HEADER_SYS_TIME_H],
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12 [
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13 dnl Use AC_REQUIRE here, so that the REPLACE_GETTIMEOFDAY=0 statement
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14 dnl below is expanded once only, before all REPLACE_GETTIMEOFDAY=1
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15 dnl statements that occur in other macros.
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16 AC_REQUIRE([gl_HEADER_SYS_TIME_H_BODY])
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17 ])
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18
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19 AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY],
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20 [
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21 AC_REQUIRE([AC_C_RESTRICT])
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22 AC_CHECK_HEADERS_ONCE([sys/time.h])
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23 gl_CHECK_NEXT_HEADERS([sys/time.h])
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25 if test $ac_cv_header_sys_time_h = yes; then
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26 HAVE_SYS_TIME_H=1
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27 else
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28 HAVE_SYS_TIME_H=0
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29 fi
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30 AC_SUBST([HAVE_SYS_TIME_H])
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32 AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval],
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33 [AC_COMPILE_IFELSE(
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34 [AC_LANG_PROGRAM(
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35 [[#if HAVE_SYS_TIME_H
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36 #include <sys/time.h>
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37 #endif
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38 #include <time.h>
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39 ]],
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40 [[static struct timeval x; x.tv_sec = x.tv_usec;]])],
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41 [gl_cv_sys_struct_timeval=yes],
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42 [gl_cv_sys_struct_timeval=no])])
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43 if test $gl_cv_sys_struct_timeval = yes; then
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44 HAVE_STRUCT_TIMEVAL=1
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45 else
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46 HAVE_STRUCT_TIMEVAL=0
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47 fi
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48 AC_SUBST([HAVE_STRUCT_TIMEVAL])
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50 dnl Assume POSIX behavior unless another module says otherwise.
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51 REPLACE_GETTIMEOFDAY=0
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52 AC_SUBST([REPLACE_GETTIMEOFDAY])
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53 if test $HAVE_SYS_TIME_H = 0 || test $HAVE_STRUCT_TIMEVAL = 0; then
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54 SYS_TIME_H=sys/time.h
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55 else
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56 SYS_TIME_H=
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57 fi
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58 AC_SUBST([SYS_TIME_H])
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59 ])