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    Subject[PATCH v3 4/8] x86-64: Add --no-undefined to vDSO build
    Date
    This gives much nicer diagnostics when something goes wrong.  It's
    supported at least as far back as binutils 2.15.

    Signed-off-by: Andy Lutomirski <luto@mit.edu>
    ---
    arch/x86/vdso/Makefile | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/vdso/Makefile b/arch/x86/vdso/Makefile
    index bef0bc9..5d17950 100644
    --- a/arch/x86/vdso/Makefile
    +++ b/arch/x86/vdso/Makefile
    @@ -26,6 +26,7 @@ targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y)
    export CPPFLAGS_vdso.lds += -P -C

    VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
    + -Wl,--no-undefined \
    -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096

    $(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so
    --
    1.7.6


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