m4/pipe2.m4

   1 # pipe2.m4 serial 2
   2 dnl Copyright (C) 2009-2014 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 AC_DEFUN([gl_FUNC_PIPE2],
   8 [
   9   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
  10
  11   dnl Persuade glibc <unistd.h> to declare pipe2().
  12   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
  13
  14   AC_CHECK_FUNCS_ONCE([pipe2])
  15   if test $ac_cv_func_pipe2 != yes; then
  16     HAVE_PIPE2=0
  17   fi
  18 ])