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ci: use 20.04 on x86_64-gnu-nopt builder
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This commit switches the x86_64-gnu-nopt builder to use Ubuntu 20.04,
which contains a more recent gdb version than Ubuntu 16.04 (newer gdb
versions fix a bug that Split DWARF can trigger, see
rust-lang#77177 for motivation). x86_64-gnu-nopt is chosen because
it runs compare modes, which is how Split DWARF testing is implemented
in rust-lang#77177.

Signed-off-by: David Wood <david@davidtw.co>
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davidtwco committed Dec 10, 2020
1 parent 39b841d commit fb75c32
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5 changes: 3 additions & 2 deletions src/ci/docker/host-x86_64/x86_64-gnu-nopt/Dockerfile
Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
FROM ubuntu:16.04
FROM ubuntu:20.04

RUN apt-get update && apt-get install -y --no-install-recommends \
# Avoid interactive prompts while installing `tzdata` dependency with `DEBIAN_FRONTEND`.
RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
g++ \
make \
ninja-build \
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