1 # Configure a replacement for <sys/time.h>. 2 3 # Copyright (C) 2007 Free Software Foundation, Inc. 4 # This file is free software; the Free Software Foundation 5 # gives unlimited permission to copy and/or distribute it, 6 # with or without modifications, as long as this notice is preserved. 7 8 # Written by Paul Eggert and Martin Lambers. 9 10 AC_DEFUN([gl_HEADER_SYS_TIME_H], 11 [ 12 dnl Use AC_REQUIRE here, so that the REPLACE_GETTIMEOFDAY=0 statement 13 dnl below is expanded once only, before all REPLACE_GETTIMEOFDAY=1 14 dnl statements that occur in other macros. 15 AC_REQUIRE([gl_HEADER_SYS_TIME_H_BODY]) 16 ]) 17 18 AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY], 19 [ 20 AC_REQUIRE([AC_C_RESTRICT]) 21 gl_CHECK_NEXT_HEADERS([sys/time.h]) 22 23 if test $ac_cv_header_sys_time_h = yes; then 24 HAVE_SYS_TIME_H=1 25 else 26 HAVE_SYS_TIME_H=0 27 fi 28 AC_SUBST([HAVE_SYS_TIME_H]) 29 30 AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval], 31 [AC_COMPILE_IFELSE( 32 [AC_LANG_PROGRAM( 33 [[#if HAVE_SYS_TIME_H 34 #include <sys/time.h> 35 #endif 36 #include <time.h> 37 ]], 38 [[static struct timeval x; x.tv_sec = x.tv_usec;]])], 39 [gl_cv_sys_struct_timeval=yes], 40 [gl_cv_sys_struct_timeval=no])]) 41 if test $gl_cv_sys_struct_timeval = yes; then 42 HAVE_STRUCT_TIMEVAL=1 43 else 44 HAVE_STRUCT_TIMEVAL=0 45 fi 46 AC_SUBST([HAVE_STRUCT_TIMEVAL]) 47 48 dnl Assume POSIX behavior unless another module says otherwise. 49 REPLACE_GETTIMEOFDAY=0 50 AC_SUBST([REPLACE_GETTIMEOFDAY]) 51 if test $HAVE_SYS_TIME_H = 0 || test $HAVE_STRUCT_TIMEVAL = 0; then 52 SYS_TIME_H=sys/time.h 53 else 54 SYS_TIME_H= 55 fi 56 AC_SUBST([SYS_TIME_H]) 57 ]) 58
