arm64: vdso: Add --eh-frame-hdr to ldflags
LLVM's unwinder depends on the .eh_frame_hdr being present for unwinding. However, when compiling Linux with GCC, the section is not present in the vdso library object and when compiling with Clang, it is present, but it has zero length. With GCC the problem was not spotted because libgcc unwinder does not require the .eh_frame_hdr section to be present. Add --eh-frame-hdr to ldflags to correctly generate and populate the section for both GCC and LLVM. Fixes: 28b1a824 ("arm64: vdso: Substitute gettimeofday() with C implementation") Reported-by: Tamas Zsoldos <tamas.zsoldos@arm.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Tested-by: Tamas Zsoldos <tamas.zsoldos@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20200507104049.47834-1-vincenzo.frascino@arm.comSigned-off-by: Will Deacon <will@kernel.org>
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