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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libgcj/51498] [4.7 regression] temporary hack to make dejagnu
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Date: Thu, 15 Dec 2011 12:42:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51498

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-12-15 12:41:49 UTC ---
Do you have a new enough version of dejagnu?
There is no need for any of these variables.
libjava.exp has:
    if ![info exists GCJ_UNDER_TEST] {
        if [info exists TOOL_EXECUTABLE] {
            set GCJ_UNDER_TEST $TOOL_EXECUTABLE;
        } else {
            if [info exists env(GCJ)] {
                set GCJ_UNDER_TEST $env(GCJ)
            } else {
                set GCJ_UNDER_TEST "[find_gcj]"
            }
        }
    }
and my dejagnu does (in /usr/share/dejagnu/libgloss.exp):
proc find_gcj {} {
    global tool_root_dir

    if {![is_remote host]} {
        set file [lookfor_file $tool_root_dir gcj]
        if { $file == "" } {
            set file [lookfor_file $tool_root_dir gcc/gcj]
        }
        if { $file != "" } {
            set CC "$file -B[file dirname $file]/"
        } else {
            set CC [transform gcj]
        }
    } else {
        set CC [transform gcj]
    }
    return $CC
}

so it should figure that out automatically.  Aren't you e.g. building in source
directory (./configure ...)?  Otherwise it would be good if you could debug why
in your case it isn't finding the right tool_root_dir and gcj in it (debugging
printouts in libjava.exp and libgloss.exp).