gnulib/import/m4/getpagesize.m4

   1 # getpagesize.m4 serial 10
   2 dnl Copyright (C) 2002, 2004-2005, 2007, 2009-2019 Free Software Foundation,
   3 dnl Inc.
   4 dnl This file is free software; the Free Software Foundation
   5 dnl gives unlimited permission to copy and/or distribute it,
   6 dnl with or without modifications, as long as this notice is preserved.
   7
   8 AC_DEFUN([gl_FUNC_GETPAGESIZE],
   9 [
  10   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
  11   AC_REQUIRE([AC_CANONICAL_HOST])
  12   gl_CHECK_FUNC_GETPAGESIZE
  13   if test $gl_cv_func_getpagesize = no; then
  14     HAVE_GETPAGESIZE=0
  15     AC_CHECK_HEADERS([OS.h])
  16     if test $ac_cv_header_OS_h = yes; then
  17       HAVE_OS_H=1
  18     fi
  19     AC_CHECK_HEADERS([sys/param.h])
  20     if test $ac_cv_header_sys_param_h = yes; then
  21       HAVE_SYS_PARAM_H=1
  22     fi
  23   fi
  24   case "$host_os" in
  25     mingw*)
  26       REPLACE_GETPAGESIZE=1
  27       ;;
  28   esac
  29   dnl Also check whether it's declared.
  30   dnl mingw has getpagesize() in libgcc.a but doesn't declare it.
  31   AC_CHECK_DECL([getpagesize], , [HAVE_DECL_GETPAGESIZE=0])
  32 ])
  33
  34 dnl Tests whether the function getpagesize() exists.
  35 dnl Sets gl_cv_func_getpagesize.
  36 AC_DEFUN([gl_CHECK_FUNC_GETPAGESIZE],
  37 [
  38   dnl We can't use AC_CHECK_FUNC here, because getpagesize() is defined as a
  39   dnl static inline function when compiling for Android 4.4 or older.
  40   AC_CACHE_CHECK([for getpagesize], [gl_cv_func_getpagesize],
  41     [AC_LINK_IFELSE(
  42        [AC_LANG_PROGRAM(
  43           [[#include <unistd.h>]],
  44           [[return getpagesize();]])
  45        ],
  46        [gl_cv_func_getpagesize=yes],
  47        [gl_cv_func_getpagesize=no])
  48     ])
  49 ])