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Switch from gcc-4.8 to gcc-8. Newer compilers come with more warning checks (usually in -Wextra). Since -Wextra is enabled in developer mode (which is also enabled in travis), this lets travis report more warnings before other people do it. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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