build: don't require using Clang compiler.

.bazelrc

@@ -1,5 +1,12 @@
-build --action_env=CC=clang
-build --action_env=CXX=clang++
+# Pass CC, CXX and PATH from the environment.
+build --action_env=CC
+build --action_env=CXX
+build --action_env=PATH
+
+# Use Clang compiler.
+build:clang --action_env=BAZEL_COMPILER=clang
+build:clang --action_env=CC=clang
+build:clang --action_env=CXX=clang++
 
 build --enable_platform_specific_config
 

.github/workflows/cpp.yml

@@ -77,6 +77,7 @@ jobs:
         bazel build
         --verbose_failures
         --test_output=errors
+        --config=clang
         -c opt
         $(bazel query 'kind(was.*_rust_binary, //test/test_data/...)')
 
@@ -114,7 +115,7 @@ jobs:
           os: ubuntu-20.04
           arch: x86_64
           action: test
-          flags: '--define crypto=system'
+          flags: --config=clang --define=crypto=system
         - name: 'V8 on macOS/x86_64'
           runtime: 'v8'
           repo: 'v8'
@@ -127,6 +128,7 @@ jobs:
           os: ubuntu-20.04
           arch: x86_64
           action: test
+          flags: --config=clang
         - name: 'WAMR on macOS/x86_64'
           runtime: 'wamr'
           repo: 'com_github_bytecodealliance_wasm_micro_runtime'
@@ -139,19 +141,22 @@ jobs:
           os: ubuntu-20.04
           arch: x86_64
           action: test
+          flags: --config=clang
         - name: 'Wasmtime on Linux/aarch64'
           runtime: 'wasmtime'
           repo: 'com_github_bytecodealliance_wasmtime'
           os: ubuntu-20.04
           arch: aarch64
           action: build
+          flags: --config=clang
           run_under: docker run --rm --env HOME=$HOME --env USER=$(id -un) --volume "$HOME:$HOME" --workdir $(pwd) --user $(id -u):$(id -g) --platform linux/arm64 piotrsikora/build-tools:bazel-5.0.0-clang-13-gcc-11
         - name: 'Wasmtime on Linux/s390x'
           runtime: 'wasmtime'
           repo: 'com_github_bytecodealliance_wasmtime'
           os: ubuntu-20.04
           arch: s390x
           action: test
+          flags: --config=clang
           run_under: docker run --rm --env HOME=$HOME --env USER=$(id -un) --volume "$HOME:$HOME" --workdir $(pwd) --user $(id -u):$(id -g) --platform linux/s390x piotrsikora/build-tools:bazel-5.0.0-clang-13-gcc-11
         - name: 'Wasmtime on macOS/x86_64'
           runtime: 'wasmtime'
@@ -165,6 +170,7 @@ jobs:
           os: ubuntu-20.04
           arch: x86_64
           action: test
+          flags: --config=clang
 
     steps:
     - uses: actions/checkout@v2