# serial 8

# See if we need to provide symlink replacement.

dnl Copyright (C) 2009-2019 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

# Written by Eric Blake.

AC_DEFUN([gl_FUNC_SYMLINK],

[

  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  AC_CHECK_FUNCS_ONCE([symlink])

  dnl The best we can do on mingw is provide a dummy that always fails, so

  dnl that compilation can proceed with fewer ifdefs.  On FreeBSD 7.2, AIX 7.1,

  dnl and Solaris 9, we want to fix a bug with trailing slash handling.

  if test $ac_cv_func_symlink = no; then

    HAVE_SYMLINK=0

  else

    AC_CACHE_CHECK([whether symlink handles trailing slash correctly],

      [gl_cv_func_symlink_works],

      [AC_RUN_IFELSE(

         [AC_LANG_PROGRAM(

           [[#include <unistd.h>

           ]],

           [[int result = 0;

             if (!symlink ("a", "conftest.link/"))

               result |= 1;

             if (symlink ("conftest.f", "conftest.lnk2"))

               result |= 2;

             else if (!symlink ("a", "conftest.lnk2/"))

               result |= 4;

             return result;

           ]])],

         [gl_cv_func_symlink_works=yes], [gl_cv_func_symlink_works=no],

         [case "$host_os" in

                             # Guess yes on Linux systems.

            linux-* | linux) gl_cv_func_symlink_works="guessing yes" ;;

                             # Guess yes on glibc systems.

            *-gnu* | gnu*)   gl_cv_func_symlink_works="guessing yes" ;;

                             # If we don't know, assume the worst.

            *)               gl_cv_func_symlink_works="guessing no" ;;

          esac

         ])

      rm -f conftest.f conftest.link conftest.lnk2])

    case "$gl_cv_func_symlink_works" in

      *yes) ;;

      *)

        REPLACE_SYMLINK=1

        ;;

    esac

  fi

])