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Annotation of embedaddon/libiconv/srcm4/time_h.m4, revision 1.1.1.1

1.1       misho       1: # Configure a more-standard replacement for <time.h>.
                      2: 
                      3: # Copyright (C) 2000-2001, 2003-2007, 2009-2011 Free Software Foundation, Inc.
                      4: 
                      5: # serial 4
                      6: 
                      7: # This file is free software; the Free Software Foundation
                      8: # gives unlimited permission to copy and/or distribute it,
                      9: # with or without modifications, as long as this notice is preserved.
                     10: 
                     11: # Written by Paul Eggert and Jim Meyering.
                     12: 
                     13: AC_DEFUN([gl_HEADER_TIME_H],
                     14: [
                     15:   dnl Use AC_REQUIRE here, so that the default behavior below is expanded
                     16:   dnl once only, before all statements that occur in other macros.
                     17:   AC_REQUIRE([gl_HEADER_TIME_H_BODY])
                     18: ])
                     19: 
                     20: AC_DEFUN([gl_HEADER_TIME_H_BODY],
                     21: [
                     22:   AC_REQUIRE([AC_C_RESTRICT])
                     23:   AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
                     24:   gl_NEXT_HEADERS([time.h])
                     25:   AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
                     26: ])
                     27: 
                     28: dnl Define HAVE_STRUCT_TIMESPEC if `struct timespec' is declared
                     29: dnl in time.h, sys/time.h, or pthread.h.
                     30: 
                     31: AC_DEFUN([gl_CHECK_TYPE_STRUCT_TIMESPEC],
                     32: [
                     33:   AC_CHECK_HEADERS_ONCE([sys/time.h])
                     34:   AC_CACHE_CHECK([for struct timespec in <time.h>],
                     35:     [gl_cv_sys_struct_timespec_in_time_h],
                     36:     [AC_COMPILE_IFELSE(
                     37:        [AC_LANG_PROGRAM(
                     38:           [[#include <time.h>
                     39:           ]],
                     40:           [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
                     41:        [gl_cv_sys_struct_timespec_in_time_h=yes],
                     42:        [gl_cv_sys_struct_timespec_in_time_h=no])])
                     43: 
                     44:   TIME_H_DEFINES_STRUCT_TIMESPEC=0
                     45:   SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=0
                     46:   PTHREAD_H_DEFINES_STRUCT_TIMESPEC=0
                     47:   if test $gl_cv_sys_struct_timespec_in_time_h = yes; then
                     48:     TIME_H_DEFINES_STRUCT_TIMESPEC=1
                     49:   else
                     50:     AC_CACHE_CHECK([for struct timespec in <sys/time.h>],
                     51:       [gl_cv_sys_struct_timespec_in_sys_time_h],
                     52:       [AC_COMPILE_IFELSE(
                     53:          [AC_LANG_PROGRAM(
                     54:             [[#include <sys/time.h>
                     55:             ]],
                     56:             [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
                     57:          [gl_cv_sys_struct_timespec_in_sys_time_h=yes],
                     58:          [gl_cv_sys_struct_timespec_in_sys_time_h=no])])
                     59:     if test $gl_cv_sys_struct_timespec_in_sys_time_h = yes; then
                     60:       SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=1
                     61:     else
                     62:       AC_CACHE_CHECK([for struct timespec in <pthread.h>],
                     63:         [gl_cv_sys_struct_timespec_in_pthread_h],
                     64:         [AC_COMPILE_IFELSE(
                     65:            [AC_LANG_PROGRAM(
                     66:               [[#include <pthread.h>
                     67:               ]],
                     68:               [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
                     69:            [gl_cv_sys_struct_timespec_in_pthread_h=yes],
                     70:            [gl_cv_sys_struct_timespec_in_pthread_h=no])])
                     71:       if test $gl_cv_sys_struct_timespec_in_pthread_h = yes; then
                     72:         PTHREAD_H_DEFINES_STRUCT_TIMESPEC=1
                     73:       fi
                     74:     fi
                     75:   fi
                     76:   AC_SUBST([TIME_H_DEFINES_STRUCT_TIMESPEC])
                     77:   AC_SUBST([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC])
                     78:   AC_SUBST([PTHREAD_H_DEFINES_STRUCT_TIMESPEC])
                     79: ])
                     80: 
                     81: AC_DEFUN([gl_TIME_MODULE_INDICATOR],
                     82: [
                     83:   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
                     84:   AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
                     85:   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
                     86:   dnl Define it also as a C macro, for the benefit of the unit tests.
                     87:   gl_MODULE_INDICATOR_FOR_TESTS([$1])
                     88: ])
                     89: 
                     90: AC_DEFUN([gl_HEADER_TIME_H_DEFAULTS],
                     91: [
                     92:   GNULIB_MKTIME=0;                       AC_SUBST([GNULIB_MKTIME])
                     93:   GNULIB_NANOSLEEP=0;                    AC_SUBST([GNULIB_NANOSLEEP])
                     94:   GNULIB_STRPTIME=0;                     AC_SUBST([GNULIB_STRPTIME])
                     95:   GNULIB_TIMEGM=0;                       AC_SUBST([GNULIB_TIMEGM])
                     96:   GNULIB_TIME_R=0;                       AC_SUBST([GNULIB_TIME_R])
                     97:   dnl Assume proper GNU behavior unless another module says otherwise.
                     98:   HAVE_DECL_LOCALTIME_R=1;               AC_SUBST([HAVE_DECL_LOCALTIME_R])
                     99:   HAVE_NANOSLEEP=1;                      AC_SUBST([HAVE_NANOSLEEP])
                    100:   HAVE_STRPTIME=1;                       AC_SUBST([HAVE_STRPTIME])
                    101:   HAVE_TIMEGM=1;                         AC_SUBST([HAVE_TIMEGM])
                    102:   dnl If another module says to replace or to not replace, do that.
                    103:   dnl Otherwise, replace only if someone compiles with -DGNULIB_PORTCHECK;
                    104:   dnl this lets maintainers check for portability.
                    105:   REPLACE_LOCALTIME_R=GNULIB_PORTCHECK;  AC_SUBST([REPLACE_LOCALTIME_R])
                    106:   REPLACE_MKTIME=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_MKTIME])
                    107:   REPLACE_NANOSLEEP=GNULIB_PORTCHECK;    AC_SUBST([REPLACE_NANOSLEEP])
                    108:   REPLACE_TIMEGM=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_TIMEGM])
                    109: ])