ci: fix ci by ensure clang-11 is defualt clang

.travis.yml

@@ -6,6 +6,7 @@ branches:
     - trying
     # Not really necessary, just to get a green badge on “master”
     - master
+    - v0.8
 language: rust
 os: linux
 dist: focal
@@ -18,24 +19,34 @@ addons:
     - clang-11
     - cmake
     - qemu-user
-rust:
-   - stable
+before_script:
+  - printenv
+  - whereis clang && clang --version
+  # remove clang-16 path from PATH
+  - export PATH=$(echo $PATH | sed -e 's|:/usr/local/clang-16.0.0/bin||')
+  # setup clang-11 as default clang
+  - sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-11 100
+  - whereis clang && clang --version
+
 env:
-  jobs:
-    # Matrix build of 3 targets against Rust stable
-    - TARGET=x86_64-unknown-linux-gnu ZLIB_INSTALLED=true AES_NI_SUPPORT=true
-    - TARGET=aarch64-unknown-linux-musl
-    - TARGET=x86_64-fortanix-unknown-sgx
   global:
     - RUST_BACKTRACE=1
     # Pinned to this particular nightly version because of core_io. This can be
     # re-pinned whenever core_io is updated to the latest nightly.
     - CORE_IO_NIGHTLY=nightly-2021-03-25
 jobs:
   include:
-    # Test additional Rust toolchains on x86_64
-    - rust: beta
-    - rust: nightly
-    - rust: nightly-2021-03-25
+    - env: TARGET=x86_64-unknown-linux-gnu ZLIB_INSTALLED=true AES_NI_SUPPORT=true
+      rust: nightly-2021-03-25
+    - env: TARGET=x86_64-fortanix-unknown-sgx
+      rust: stable
+    - env: TARGET=aarch64-unknown-linux-musl
+      rust: stable
+    - env: TARGET=x86_64-unknown-linux-gnu ZLIB_INSTALLED=true AES_NI_SUPPORT=true
+      rust: nightly
+    - env: TARGET=x86_64-unknown-linux-gnu ZLIB_INSTALLED=true AES_NI_SUPPORT=true
+      rust: beta
+    - env: TARGET=x86_64-unknown-linux-gnu ZLIB_INSTALLED=true AES_NI_SUPPORT=true
+      rust: stable
 script:
   - ./ct.sh