As part of a Travis build, I’m running a relatively simple bash script downloaded from here . On xenial only, in the third job here , I get an error here as follows: +++ADD_ARGS+=(--static --with-lapack='-llapack -lblas -lgfortran -lquadmath -lm') +++export ADD_ARGS+ coinbrew/.ci/setup_environment.s…

Bash 4.3 ( the one in Xenial ) does not support += under export: $ sudo docker run -it ubuntu:xenial # bash --version GNU bash, version 4.3.48(1)-release (x86_64-pc-linux-gnu) <...> # declare -a ADD_ARGS # export ADD_ARGS=() # export ADD_ARGS+=( --static --with-lapack='-llapack -lblas -lgfortran -lqu…

To follow up, I now ran the script in the same Docker container that seems to be used on the build machine (travisci/ci-ubuntu-1804:packer-1593521720-ca42795e) and everything works fine so there is something funny going on here…

"+=" Bash syntax is misinterpreted in Xenial but works in Bionic

Environments Linux

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"+=" Bash syntax is misinterpreted in Xenial but works in Bionic

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