https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100017
--- Comment #59 from cqwrteur <unlvsur at live dot com> ---
(In reply to Jakub Jelinek from comment #57)
> I don't see how the patch could be correct.
> Looking at RAW_CXX_FOR_TARGET in configure, I see:
> (starting with the line you're proposing to change):
> RAW_CXX_FOR_TARGET="$CXX_FOR_TARGET"
> ...
> { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target
> c++ for libstdc++" >&5
> $as_echo_n "checking where to find the target c++ for libstdc++... " >&6; }
> if test "x${build}" != "x${host}" ; then
> if expr "x$RAW_CXX_FOR_TARGET" : "x/" > /dev/null; then
> # We already found the complete path
> ac_dir=`dirname $RAW_CXX_FOR_TARGET`
> { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in
> $ac_dir" >&5
> $as_echo "pre-installed in $ac_dir" >&6; }
> else
> # Canadian cross, just use what we found
> { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
> $as_echo "pre-installed" >&6; }
> fi
> else
>
> So, if CXX_FOR_TARGET starts with /, e.g. /opt/gcc-11.1/bin/g++ , then
> the above will use dirname /opt/gcc-11.1/bin/g++ and set ac_dir to
> /opt/gcc-11.1/bin
> But with the proposed change, $RAW_CXX_FOR_TARGET will be
> /opt/gcc-11.1/bin/g++ -nostdinc++ and dirname will fail miserably and not
> set ac_dir to anything:
> dirname /opt/gcc-11.1/bin/g++ -nostdinc++
> dirname: invalid option -- 'n'
> Try 'dirname --help' for more information.
So is this just an issue to libstdc++'s configure script only? Why the autotool
fails to find header files?
