[Bug testsuite/49741] make -k check-c++0x not multilib aware

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49741

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2011-07-15 
03:44:30 UTC ---
Hmm, it seems that --tool_opts confuses the multilib support.  In g++.exp we
have

        if [info exists TOOL_OPTIONS] {
            lappend ALWAYS_CXXFLAGS "additional_flags=[g++_include_flags
[get_multilibs ${TOOL_OPTIONS}] ]"
            lappend ALWAYS_CXXFLAGS "ldflags=[g++_link_flags [get_multilibs
${TOOL_OPTIONS}] ]\
"
        } else {
            lappend ALWAYS_CXXFLAGS "additional_flags=[g++_include_flags
[get_multilibs] ]"
            lappend ALWAYS_CXXFLAGS "ldflags=[g++_link_flags [get_multilibs] ]"
        }

And apparently [get_multilibs "-std=gnu++0x"] gives a different result from
[get_multilibs].

This is a bug in dejagnu; there was a patch submitted for this issue many years
ago at

http://lists.gnu.org/archive/html/dejagnu/2002-10/msg00007.html

but it seems to have been ignored.

Hmm, maybe I should kludge around this with a custom flag after all...