clang-9 on travis?

From: John Maddock (jz.maddock_at_[hidden])
Date: 2019-09-23 17:42:07

Has anyone figured out how to install clang-9 on travis?

I'm seeing:

Adding APT Sources

Disallowing sources: llvm-toolchain-xenial-9

See https://travis-ci.org/boostorg/multiprecision/jobs/588146074

With .travis.yml containing:

     - os: linux
       env: TOOLSET=clang COMPILER=clang++-9 CXXSTD=c++17 TEST_SUITE=misc
       addons:
         apt:
           packages:
             - clang-9
             - libgmp-dev
             - libmpfr-dev
             - libmpc-dev
             - libmpfi-dev
           sources:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-xenial-9

Which works fine for clang-8.
Any ideas anyone?

Thanks!  John.

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