ci: Default clang build

Switch build artifact to a default clang build.

Testing with the build artifact locally, `make test` is failing with `/lib/x86_64-linux-gnu/libstdc++.so.6: version 'GLIBCXX_3.4.29' not found`.  Using the gcc-11 build (might be?) installing GLIBCXX_3.4.29 but not linking it into the build.  Rather than trying to get it to link, just use the pre-installed `clang` instead.

.github/workflows/test-linux.yml

@@ -19,6 +19,7 @@ jobs:
         os:
           - { id: ubuntu-20.04, name: focal }
         compiler:
+          - 'clang'
           - 'clang-12'
           - 'gcc-11'
         cpp_std:
@@ -43,7 +44,7 @@ jobs:
           echo "CXXFLAGS=-Wp,-D_GLIBCXX_ASSERTIONS" >> $GITHUB_ENV
 
       - name: Setup Clang
-        if: startsWith(matrix.compiler, 'clang')
+        if: startsWith(matrix.compiler, 'clang') && (matrix.compiler != 'clang')
         shell: bash
         run: |
           wget https://apt.llvm.org/llvm-snapshot.gpg.key
@@ -85,7 +86,7 @@ jobs:
           tar -cvf ../build.tar share/ yosys yosys-*
 
       - name: Store build artifact
-        if: (matrix.cpp_std == 'c++11') && (matrix.compiler == 'gcc-11')
+        if: (matrix.cpp_std == 'c++11') && (matrix.compiler == 'clang')
         uses: actions/upload-artifact@v4
         with:
           name: build-artifact

tests/tools/autotest.mk

@@ -7,7 +7,7 @@ SEEDOPT=-S$(SEED)
 endif
 
 $(MAKECMDGOALS):
-	@$(basename $(MAKEFILE_LIST)).sh -G -j $(SEEDOPT) $(EXTRA_FLAGS) $@
+	@$(basename $(MAKEFILE_LIST)).sh -G -j -v $(SEEDOPT) $(EXTRA_FLAGS) $@
 
 .PHONY: $(MAKECMDGOALS)