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diff --git a/gl/m4/rename.m4 b/gl/m4/rename.m4
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+# serial 34
+
+# Copyright (C) 2001, 2003, 2005-2006, 2009-2023 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+dnl From Volker Borchert.
+dnl Determine whether rename works for source file names with a trailing slash.
+dnl The rename from SunOS 4.1.1_U1 doesn't.
+dnl
+dnl If it doesn't, then define RENAME_TRAILING_SLASH_BUG and arrange
+dnl to compile the wrapper function.
+dnl
+
+AC_DEFUN([gl_FUNC_RENAME],
+[
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ AC_REQUIRE([gl_STDIO_H_DEFAULTS])
+ AC_CHECK_FUNCS_ONCE([lstat])
+
+ dnl Solaris 11.3, AIX 7.1 mistakenly allow rename("file","name/").
+ dnl NetBSD 1.6 mistakenly forbids rename("dir","name/").
+ dnl FreeBSD 7.2 mistakenly allows rename("file","link-to-file/").
+ dnl The Solaris bug can be worked around without stripping
+ dnl trailing slash, while the NetBSD bug requires stripping;
+ dnl the two conditions can be distinguished by whether hard
+ dnl links are also broken.
+ AC_CACHE_CHECK([whether rename honors trailing slash on destination],
+ [gl_cv_func_rename_slash_dst_works],
+ [rm -rf conftest.f conftest.f1 conftest.f2 conftest.d1 conftest.d2 conftest.lnk
+ touch conftest.f && touch conftest.f1 && mkdir conftest.d1 ||
+ AC_MSG_ERROR([cannot create temporary files])
+ # Assume that if we have lstat, we can also check symlinks.
+ if test $ac_cv_func_lstat = yes; then
+ ln -s conftest.f conftest.lnk
+ fi
+ AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM([[
+# include <stdio.h>
+# include <stdlib.h>
+ ]],
+ [[int result = 0;
+ if (rename ("conftest.f1", "conftest.f2/") == 0)
+ result |= 1;
+ if (rename ("conftest.d1", "conftest.d2/") != 0)
+ result |= 2;
+#if HAVE_LSTAT
+ if (rename ("conftest.f", "conftest.lnk/") == 0)
+ result |= 4;
+#endif
+ return result;
+ ]])],
+ [gl_cv_func_rename_slash_dst_works=yes],
+ [gl_cv_func_rename_slash_dst_works=no],
+ dnl When crosscompiling, assume rename is broken.
+ [case "$host_os" in
+ # Guess yes on Linux systems.
+ linux-* | linux) gl_cv_func_rename_slash_dst_works="guessing yes" ;;
+ # Guess yes on systems that emulate the Linux system calls.
+ midipix*) gl_cv_func_rename_slash_dst_works="guessing yes" ;;
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_rename_slash_dst_works="guessing yes" ;;
+ # Guess no on native Windows.
+ mingw*) gl_cv_func_rename_slash_dst_works="guessing no" ;;
+ # If we don't know, obey --enable-cross-guesses.
+ *) gl_cv_func_rename_slash_dst_works="$gl_cross_guess_normal" ;;
+ esac
+ ])
+ rm -rf conftest.f conftest.f1 conftest.f2 conftest.d1 conftest.d2 conftest.lnk
+ ])
+ case "$gl_cv_func_rename_slash_dst_works" in
+ *yes) ;;
+ *)
+ REPLACE_RENAME=1
+ AC_DEFINE([RENAME_TRAILING_SLASH_DEST_BUG], [1],
+ [Define if rename does not correctly handle slashes on the destination
+ argument, such as on Solaris 11 or NetBSD 1.6.])
+ ;;
+ esac
+
+ dnl SunOS 4.1.1_U1 mistakenly forbids rename("dir/","name").
+ dnl Solaris 9 mistakenly allows rename("file/","name").
+ dnl FreeBSD 7.2 mistakenly allows rename("link-to-file/","name").
+ dnl These bugs require stripping trailing slash to avoid corrupting
+ dnl symlinks with a trailing slash.
+ AC_CACHE_CHECK([whether rename honors trailing slash on source],
+ [gl_cv_func_rename_slash_src_works],
+ [rm -rf conftest.f conftest.f1 conftest.d1 conftest.d2 conftest.d3 conftest.lnk
+ touch conftest.f && touch conftest.f1 && mkdir conftest.d1 ||
+ AC_MSG_ERROR([cannot create temporary files])
+ # Assume that if we have lstat, we can also check symlinks.
+ if test $ac_cv_func_lstat = yes; then
+ ln -s conftest.f conftest.lnk
+ fi
+ AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM([[
+# include <stdio.h>
+# include <stdlib.h>
+ ]],
+ [[int result = 0;
+ if (rename ("conftest.f1/", "conftest.d3") == 0)
+ result |= 1;
+ if (rename ("conftest.d1/", "conftest.d2") != 0)
+ result |= 2;
+#if HAVE_LSTAT
+ if (rename ("conftest.lnk/", "conftest.f") == 0)
+ result |= 4;
+#endif
+ return result;
+ ]])],
+ [gl_cv_func_rename_slash_src_works=yes],
+ [gl_cv_func_rename_slash_src_works=no],
+ dnl When crosscompiling, assume rename is broken.
+ [case "$host_os" in
+ # Guess yes on Linux systems.
+ linux-* | linux) gl_cv_func_rename_slash_src_works="guessing yes" ;;
+ # Guess yes on systems that emulate the Linux system calls.
+ midipix*) gl_cv_func_rename_slash_src_works="guessing yes" ;;
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_rename_slash_src_works="guessing yes" ;;
+ # Guess yes on native Windows.
+ mingw*) gl_cv_func_rename_slash_src_works="guessing yes" ;;
+ # If we don't know, obey --enable-cross-guesses.
+ *) gl_cv_func_rename_slash_src_works="$gl_cross_guess_normal" ;;
+ esac
+ ])
+ rm -rf conftest.f conftest.f1 conftest.d1 conftest.d2 conftest.d3 conftest.lnk
+ ])
+ case "$gl_cv_func_rename_slash_src_works" in
+ *yes) ;;
+ *)
+ REPLACE_RENAME=1
+ AC_DEFINE([RENAME_TRAILING_SLASH_SOURCE_BUG], [1],
+ [Define if rename does not correctly handle slashes on the source
+ argument, such as on Solaris 9 or cygwin 1.5.])
+ ;;
+ esac
+
+ dnl NetBSD 1.6 and cygwin 1.5.x mistakenly reduce hard link count
+ dnl on rename("h1","h2").
+ dnl This bug requires stat'ting targets prior to attempting rename.
+ AC_CHECK_FUNCS_ONCE([link])
+ AC_CACHE_CHECK([whether rename manages hard links correctly],
+ [gl_cv_func_rename_link_works],
+ [if test $ac_cv_func_link = yes; then
+ if test $cross_compiling != yes; then
+ rm -rf conftest.f conftest.f1 conftest.f2
+ if touch conftest.f conftest.f2 && ln conftest.f conftest.f1 &&
+ set x `ls -i conftest.f conftest.f1` && test "$2" = "$4"; then
+ AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM([[
+# include <errno.h>
+# include <stdio.h>
+# include <stdlib.h>
+# include <unistd.h>
+ ]GL_MDA_DEFINES],
+ [[int result = 0;
+ if (rename ("conftest.f", "conftest.f1"))
+ result |= 1;
+ if (unlink ("conftest.f1"))
+ result |= 2;
+
+ /* Allow either the POSIX-required behavior, where the
+ previous rename kept conftest.f, or the (better) NetBSD
+ behavior, where it removed conftest.f. */
+ if (rename ("conftest.f", "conftest.f") != 0
+ && errno != ENOENT)
+ result |= 4;
+
+ if (rename ("conftest.f1", "conftest.f1") == 0)
+ result |= 8;
+ if (rename ("conftest.f2", "conftest.f2") != 0)
+ result |= 16;
+ return result;
+ ]])],
+ [gl_cv_func_rename_link_works=yes],
+ [gl_cv_func_rename_link_works=no],
+ [dnl We don't get here.
+ :
+ ])
+ else
+ gl_cv_func_rename_link_works="guessing no"
+ fi
+ rm -rf conftest.f conftest.f1 conftest.f2
+ else
+ dnl When crosscompiling, assume rename is broken.
+ case "$host_os" in
+ # Guess yes on Linux systems.
+ linux-* | linux) gl_cv_func_rename_link_works="guessing yes" ;;
+ # Guess yes on systems that emulate the Linux system calls.
+ midipix*) gl_cv_func_rename_link_works="guessing yes" ;;
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_rename_link_works="guessing yes" ;;
+ # Guess yes on native Windows.
+ mingw*) gl_cv_func_rename_link_works="guessing yes" ;;
+ # If we don't know, obey --enable-cross-guesses.
+ *) gl_cv_func_rename_link_works="$gl_cross_guess_normal" ;;
+ esac
+ fi
+ else
+ gl_cv_func_rename_link_works=yes
+ fi
+ ])
+ case "$gl_cv_func_rename_link_works" in
+ *yes) ;;
+ *)
+ REPLACE_RENAME=1
+ AC_DEFINE([RENAME_HARD_LINK_BUG], [1],
+ [Define if rename fails to leave hard links alone, as on NetBSD 1.6
+ or Cygwin 1.5.])
+ ;;
+ esac
+
+ dnl Cygwin 1.5.x mistakenly allows rename("dir","file").
+ dnl mingw mistakenly forbids rename("dir1","dir2").
+ dnl These bugs require stripping trailing slash to avoid corrupting
+ dnl symlinks with a trailing slash.
+ AC_CACHE_CHECK([whether rename manages existing destinations correctly],
+ [gl_cv_func_rename_dest_works],
+ [rm -rf conftest.f conftest.d1 conftest.d2
+ touch conftest.f && mkdir conftest.d1 conftest.d2 ||
+ AC_MSG_ERROR([cannot create temporary files])
+ AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM([[
+# include <stdio.h>
+# include <stdlib.h>
+ ]],
+ [[int result = 0;
+ if (rename ("conftest.d1", "conftest.d2") != 0)
+ result |= 1;
+ if (rename ("conftest.d2", "conftest.f") == 0)
+ result |= 2;
+ return result;
+ ]])],
+ [gl_cv_func_rename_dest_works=yes],
+ [gl_cv_func_rename_dest_works=no],
+ dnl When crosscompiling, assume rename is broken.
+ [case "$host_os" in
+ # Guess yes on Linux systems.
+ linux-* | linux) gl_cv_func_rename_dest_works="guessing yes" ;;
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_rename_dest_works="guessing yes" ;;
+ # Guess no on native Windows.
+ mingw*) gl_cv_func_rename_dest_works="guessing no" ;;
+ # If we don't know, obey --enable-cross-guesses.
+ *) gl_cv_func_rename_dest_works="$gl_cross_guess_normal" ;;
+ esac
+ ])
+ rm -rf conftest.f conftest.d1 conftest.d2
+ ])
+ case "$gl_cv_func_rename_dest_works" in
+ *yes) ;;
+ *)
+ REPLACE_RENAME=1
+ AC_DEFINE([RENAME_DEST_EXISTS_BUG], [1],
+ [Define if rename does not work when the destination file exists,
+ as on Cygwin 1.5 or Windows.])
+ ;;
+ esac
+])
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