Merge #18477: ci: Use Focal for fuzzers

faa9491870 ci: Use Focal for fuzzers (MarcoFalke)

Pull request description:

  This gives us access to clang-10, as well as a newer version of valgrind

ACKs for top commit:
  fanquake:
    ACK faa9491870 - [Clang 10](https://packages.ubuntu.com/focal/clang) and [valgrind 3.15](https://packages.ubuntu.com/focal/valgrind).
  practicalswift:
    ACK faa9491870 -- diff looks correct & contemporary clang is better than vintage clang

Tree-SHA512: 0e67232673434c0309db79c1054e3e981115083585945967e346f4d58792635832100f89911428aab928155e44e5f401207a023681ae008fdb5280cf02c4d427

.travis.yml

@@ -132,12 +132,12 @@ jobs:
         FILE_ENV="./ci/test/00_setup_env_native_valgrind.sh"
 
     - stage: test
-      name: 'x86_64 Linux  [GOAL: install]  [bionic]  [no depends, only system libs, sanitizers: fuzzer,address,undefined]'
+      name: 'x86_64 Linux  [GOAL: install]  [focal]  [no depends, only system libs, sanitizers: fuzzer,address,undefined]'
       env: >-
         FILE_ENV="./ci/test/00_setup_env_native_fuzz.sh"
 
     - stage: test
-      name: 'x86_64 Linux  [GOAL: install]  [bionic]  [no depends, only system libs, fuzzers under valgrind]'
+      name: 'x86_64 Linux  [GOAL: install]  [focal]  [no depends, only system libs, fuzzers under valgrind]'
       env: >-
         FILE_ENV="./ci/test/00_setup_env_native_fuzz_with_valgrind.sh"
 

ci/test/00_setup_env_native_fuzz.sh

@@ -6,12 +6,12 @@
 
 export LC_ALL=C.UTF-8
 
+export DOCKER_NAME_TAG="ubuntu:20.04"
 export CONTAINER_NAME=ci_native_fuzz
-export PACKAGES="clang-8 llvm-8 python3 libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-test-dev libboost-thread-dev"
+export PACKAGES="clang llvm python3 libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-test-dev libboost-thread-dev"
 export NO_DEPENDS=1
 export RUN_UNIT_TESTS=false
 export RUN_FUNCTIONAL_TESTS=false
 export RUN_FUZZ_TESTS=true
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-fuzz --with-sanitizers=fuzzer,address,undefined CC=clang-8 CXX=clang++-8"
-# Use clang-8, instead of default clang on bionic, which is clang-6 and does not come with libfuzzer on aarch64
+export BITCOIN_CONFIG="--enable-fuzz --with-sanitizers=fuzzer,address,undefined CC=clang CXX=clang++"

ci/test/00_setup_env_native_fuzz_with_valgrind.sh

@@ -6,13 +6,13 @@
 
 export LC_ALL=C.UTF-8
 
+export DOCKER_NAME_TAG="ubuntu:20.04"
 export CONTAINER_NAME=ci_native_fuzz_valgrind
-export PACKAGES="clang-8 llvm-8 python3 libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-test-dev libboost-thread-dev valgrind"
+export PACKAGES="clang llvm python3 libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-test-dev libboost-thread-dev valgrind"
 export NO_DEPENDS=1
 export RUN_UNIT_TESTS=false
 export RUN_FUNCTIONAL_TESTS=false
 export RUN_FUZZ_TESTS=true
 export FUZZ_TESTS_CONFIG="--valgrind"
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-fuzz --with-sanitizers=fuzzer CC=clang-8 CXX=clang++-8"
-# Use clang-8, instead of default clang on bionic, which is clang-6 and does not come with libfuzzer on aarch64
+export BITCOIN_CONFIG="--enable-fuzz --with-sanitizers=fuzzer CC=clang CXX=clang++"