id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
3655	Flaws in GCC installation instructions	Wakely	lfs-book@…	"http://www.linuxfromscratch.org/lfs/view/development/chapter05/gcc-pass1.html lists the `--disable-libmudflap` option under ""The meaning of the configure options:"" but that option is not present in the command (and is meaningless for GCC 4.9)

http://www.linuxfromscratch.org/lfs/view/development/chapter05/gcc-pass2.html says `--enable-clocale=gnu` is needed because ""if the de_DE locale is not installed [...] the incorrect generic locale model may be selected"". I don't believe that's true, the libstdc++ configure script doesn't check for de_DE, only the libstdc++ testsuite does (which cannot affect the ABI). `--enable-clocale=gnu` is the default for all linux systems so the option is not needed and the explanation is incorrect:
{{{
  # Probe for locale model to use if none specified.
  # Default to ""generic"".
  if test $enable_clocale_flag = auto; then
    case ${target_os} in
      linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
        enable_clocale_flag=gnu
        ;;
}}}

The GCC Pass 2 page also says for `--enable-threads=posix` that ""This enables C++ exception handling for multi-threaded code."" but that's not true, it chooses the thread model, but not anything to do with exceptions. The only supported models on GNU/Linux are ""posix"" and ""single"" and the default is ""posix"" so the option is not needed.

Also, `--enable-__cxa_atexit` is the default for linux (see gcc/config.gcc and gcc/configure.ac), so is also not needed.
"	defect	closed	normal	7.6	Book	SVN	normal	fixed