https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100427
--- Comment #7 from cqwrteur <unlvsur at live dot com> --- This is incorrect when we canadian build multilib. unfortunately. I find this is an issue for not just libstdc++, but libaotmic, libssp etc too. This script is clearly just not right. It should only copy DLLs from lib not from lib32. and copy DLLs of 32bit to /lib32 yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*) library_names_spec='$libname.dll.a' # DLL is installed to $(libdir)/../bin by postinstall_cmds postinstall_cmds='base_file=`basename \${file}`~ dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~ dldir=$destdir/`dirname \$dlpath`~ test -d \$dldir || mkdir -p \$dldir~ $install_prog $dir/$dlname \$dldir/$dlname~ chmod a+x \$dldir/$dlname~ if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then eval '\''$striplib \$dldir/$dlname'\'' || exit \$?; fi' postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~ dlpath=$dir/\$dldll~ $RM \$dlpath' shlibpath_overrides_runpath=yes