+ 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_CACHE_CHECK([whether rename manages hard links correctly],
+ [gl_cv_func_rename_link_works],
+ [rm -rf conftest.f conftest.f1
+ if touch conftest.f && ln conftest.f conftest.f1 &&
+ set x `ls -i conftest.f conftest.f1` && test "$2" = "$4"; then
+ AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+# include <stdio.h>
+# include <stdlib.h>
+# include <unistd.h>
+]], [if (rename ("conftest.f", "conftest.f1")) return 1;
+ if (unlink ("conftest.f1")) return 2;
+ if (rename ("conftest.f", "conftest.f")) return 3;
+ if (rename ("conftest.f1", "conftest.f1") == 0) return 4;])],
+ [gl_cv_func_rename_link_works=yes],
+ [gl_cv_func_rename_link_works=no],
+ dnl When crosscompiling, assume rename is broken.
+ [gl_cv_func_rename_link_works="guessing no"])
+ else
+ gl_cv_func_rename_link_works="guessing no"
+ fi
+ rm -rf conftest.f conftest.f1
+ ])
+ if test "x$gl_cv_func_rename_link_works" != xyes; then
+ AC_LIBOBJ([rename])
+ 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.])
+ fi
+
+ 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>
+]], [if (rename ("conftest.d1", "conftest.d2") != 0) return 1;
+ if (rename ("conftest.d2", "conftest.f") == 0) return 2;])],
+ [gl_cv_func_rename_dest_works=yes],
+ [gl_cv_func_rename_dest_works=no],
+ dnl When crosscompiling, assume rename is broken.
+ [gl_cv_func_rename_dest_works="guessing no"])
+ rm -rf conftest.f conftest.d1 conftest.d2
+ ])
+ if test "x$gl_cv_func_rename_dest_works" != xyes; then
+ AC_LIBOBJ([rename])
+ 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.])
+ fi