| 1 | # serial 9
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| 2 | # See if we need to provide symlink replacement.
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| 3 |
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| 4 | dnl Copyright (C) 2009-2021 Free Software Foundation, Inc.
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| 5 | dnl This file is free software; the Free Software Foundation
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| 6 | dnl gives unlimited permission to copy and/or distribute it,
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| 7 | dnl with or without modifications, as long as this notice is preserved.
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| 8 |
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| 9 | # Written by Eric Blake.
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| 10 |
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| 11 | AC_DEFUN([gl_FUNC_SYMLINK],
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| 12 | [
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| 13 | AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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| 14 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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| 15 | AC_CHECK_FUNCS_ONCE([symlink])
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| 16 | dnl The best we can do on mingw is provide a dummy that always fails, so
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| 17 | dnl that compilation can proceed with fewer ifdefs. On FreeBSD 7.2, AIX 7.1,
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| 18 | dnl and Solaris 9, we want to fix a bug with trailing slash handling.
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| 19 | if test $ac_cv_func_symlink = no; then
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| 20 | HAVE_SYMLINK=0
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| 21 | else
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| 22 | AC_CACHE_CHECK([whether symlink handles trailing slash correctly],
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| 23 | [gl_cv_func_symlink_works],
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| 24 | [AC_RUN_IFELSE(
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| 25 | [AC_LANG_PROGRAM(
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| 26 | [[#include <unistd.h>
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| 27 | ]],
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| 28 | [[int result = 0;
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| 29 | if (!symlink ("a", "conftest.link/"))
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| 30 | result |= 1;
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| 31 | if (symlink ("conftest.f", "conftest.lnk2"))
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| 32 | result |= 2;
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| 33 | else if (!symlink ("a", "conftest.lnk2/"))
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| 34 | result |= 4;
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| 35 | return result;
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| 36 | ]])],
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| 37 | [gl_cv_func_symlink_works=yes], [gl_cv_func_symlink_works=no],
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| 38 | [case "$host_os" in
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| 39 | # Guess yes on Linux systems.
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| 40 | linux-* | linux) gl_cv_func_symlink_works="guessing yes" ;;
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| 41 | # Guess yes on glibc systems.
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| 42 | *-gnu* | gnu*) gl_cv_func_symlink_works="guessing yes" ;;
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| 43 | # If we don't know, obey --enable-cross-guesses.
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| 44 | *) gl_cv_func_symlink_works="$gl_cross_guess_normal" ;;
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| 45 | esac
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| 46 | ])
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| 47 | rm -f conftest.f conftest.link conftest.lnk2])
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| 48 | case "$gl_cv_func_symlink_works" in
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| 49 | *yes) ;;
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| 50 | *)
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| 51 | REPLACE_SYMLINK=1
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| 52 | ;;
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| 53 | esac
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| 54 | fi
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| 55 | ])
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