Reproduction: ``` $ mkdir '\9' $ cd '\9' $ git clone https://github.com/haskell/network $ cd network $ git checkout 7e3f16d57b8745ef12cec8c9164bb91eeac90b5b # known-to-fail commit $ autoconf $ ./configure ```
This fails for me with this line: ``` sed: -e expression #1, char 400: invalid reference \9 on `s' command's RHS ``` The offending `sed` invocation is in `config.status`, generated by `configure` with these lines: ``` # Neutralize VPATH when `$srcdir' = `.'. # Shell code in configure.ac might set extrasub. # FIXME: do we really want to maintain this feature? cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1 ac_sed_extra="$ac_vpsub $extrasub _ACEOF cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1 :t /@[a-zA-Z_][a-zA-Z_0-9]*@/!b s|@configure_input@|$ac_sed_conf_input|;t t s&@top_builddir@&$ac_top_builddir_sub&;t t s&@top_build_prefix@&$ac_top_build_prefix&;t t s&@srcdir@&$ac_srcdir&;t t s&@abs_srcdir@&$ac_abs_srcdir&;t t s&@top_srcdir@&$ac_top_srcdir&;t t s&@abs_top_srcdir@&$ac_abs_top_srcdir&;t t s&@builddir@&$ac_builddir&;t t s&@abs_builddir@&$ac_abs_builddir&;t t s&@abs_top_builddir@&$ac_abs_top_builddir&;t t $ac_datarootdir_hack " eval sed \"\$ac_sed_extra\" "$ac_file_inputs" | $AWK -f "$ac_tmp/subs.awk" \ >$ac_tmp/out || as_fn_error $? "could not create $ac_file" "$LINENO" 5 ``` `$ac_abs_srcdir` and friends contain the `\9` segment, which `sed` is interpreting as a back-reference. ``` $ autoconf --version autoconf (GNU Autoconf) 2.69 Copyright (C) 2012 Free Software Foundation, Inc. License GPLv3+/Autoconf: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>, <http://gnu.org/licenses/exceptions.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Written by David J. MacKenzie and Akim Demaille. ``` This bug has been tracked at https://github.com/haskell/cabal/issues/5386 and https://github.com/commercialhaskell/stack/issues/3944.
