symlink.m4 1.97 KB
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# serial 8
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# See if we need to provide symlink replacement.

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dnl Copyright (C) 2009-2018 Free Software Foundation, Inc.
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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])
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  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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  AC_CHECK_FUNCS_ONCE([symlink])
  dnl The best we can do on mingw is provide a dummy that always fails, so
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  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.
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  if test $ac_cv_func_symlink = no; then
    HAVE_SYMLINK=0
  else
    AC_CACHE_CHECK([whether symlink handles trailing slash correctly],
      [gl_cv_func_symlink_works],
      [AC_RUN_IFELSE(
         [AC_LANG_PROGRAM(
           [[#include <unistd.h>
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           ]],
           [[int result = 0;
             if (!symlink ("a", "conftest.link/"))
               result |= 1;
             if (symlink ("conftest.f", "conftest.lnk2"))
               result |= 2;
             else if (!symlink ("a", "conftest.lnk2/"))
               result |= 4;
             return result;
           ]])],
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         [gl_cv_func_symlink_works=yes], [gl_cv_func_symlink_works=no],
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         [case "$host_os" in
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                             # 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" ;;
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          esac
         ])
Eric Blake's avatar
Eric Blake committed
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      rm -f conftest.f conftest.link conftest.lnk2])
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    case "$gl_cv_func_symlink_works" in
      *yes) ;;
      *)
        REPLACE_SYMLINK=1
        ;;
    esac
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  fi
])