X-Git-Url: https://git.cworth.org/git?p=tar;a=blobdiff_plain;f=m4%2Fsymlink.m4;fp=m4%2Fsymlink.m4;h=fb619846076bcfdd0d90d629395e44029297adee;hp=0000000000000000000000000000000000000000;hb=de7372b23c3da92fbfaea2d1ac592f0b2ba87914;hpb=fbbfb9406a82e647ce27b6462b11a802fa48f31a

diff --git a/m4/symlink.m4 b/m4/symlink.m4
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+++ b/m4/symlink.m4
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+# serial 3
+# See if we need to provide symlink replacement.
+
+dnl Copyright (C) 2009, 2010 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_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 $ac_cv_func_symlink = no; then
+    HAVE_SYMLINK=0
+    AC_LIBOBJ([symlink])
+  else
+    AC_CACHE_CHECK([whether symlink handles trailing slash correctly],
+      [gl_cv_func_symlink_works],
+      [AC_RUN_IFELSE(
+         [AC_LANG_PROGRAM(
+           [[#include <unistd.h>
+]], [[if (!symlink ("a", "conftest.link/")) return 1;
+      if (symlink ("conftest.f", "conftest.lnk2")) return 2;
+      if (!symlink ("a", "conftest.lnk2/")) return 3;]])],
+         [gl_cv_func_symlink_works=yes], [gl_cv_func_symlink_works=no],
+         [gl_cv_func_symlink_works="guessing no"])
+      rm -f conftest.f conftest.link conftest.lnk2])
+    if test "$gl_cv_func_symlink_works" != yes; then
+      REPLACE_SYMLINK=1
+      AC_LIBOBJ([symlink])
+    fi
+  fi
+])