CI: Add compiler matrix for gcc and clang testing

Add compiler matrix strategy to test builds with both gcc and clang
compilers. This ensures the codebase compiles and passes tests with
different compilers.

Author: eleanorLYJ

.github/workflows/main.yml

@@ -36,6 +36,10 @@ jobs:
   host-x64:
     needs: [detect-code-related-file-changes]
     if: needs.detect-code-related-file-changes.outputs.has_code_related_changes == 'true'
+    strategy:
+      fail-fast: false
+      matrix:
+        compiler: [gcc, clang]
     runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@v4
@@ -49,33 +53,53 @@ jobs:
             sudo chmod +x ./llvm.sh
             sudo ./llvm.sh 18
       shell: bash
+    - name: Install compiler
+      id: install_cc
+      uses: rlalik/setup-cpp-compiler@master
+      with:
+        compiler: ${{ matrix.compiler }}
     - name: default build
+      env:
+        CC: ${{ steps.install_cc.outputs.cc }}
       run: make -j$(nproc)
     - name: check + tests
+      env:
+        CC: ${{ steps.install_cc.outputs.cc }}
       run: |
+            make clean
             make check -j$(nproc)
             make tests -j$(nproc)
             make misalign -j$(nproc)
             make tool -j$(nproc)
     - name: diverse configurations
+      env:
+        CC: ${{ steps.install_cc.outputs.cc }}
       run: |
             make distclean && make ENABLE_EXT_M=0 check -j$(nproc)
             make distclean && make ENABLE_EXT_A=0 check -j$(nproc)
             make distclean && make ENABLE_EXT_F=0 check -j$(nproc)
             make distclean && make ENABLE_EXT_C=0 check -j$(nproc)
             make distclean && make ENABLE_SDL=0 check -j$(nproc)
     - name: misalignment test in block emulation
+      env:
+        CC: ${{ steps.install_cc.outputs.cc }}
       run: |
             make -C tests/system/alignment/
             make distclean && make ENABLE_ELF_LOADER=1 ENABLE_EXT_C=0 ENABLE_SYSTEM=1 misalign-in-blk-emu -j$(nproc)
     - name: MMU test
+      env:
+        CC: ${{ steps.install_cc.outputs.cc }}
       run: |
             make -C tests/system/mmu/
             make distclean && make ENABLE_ELF_LOADER=1 ENABLE_SYSTEM=1 mmu-test -j$(nproc)
     - name: gdbstub test
+      env:
+        CC: ${{ steps.install_cc.outputs.cc }}
       run: |
             make distclean && make ENABLE_GDBSTUB=1 gdbstub-test -j$(nproc)
     - name: JIT test
+      env:
+        CC: ${{ steps.install_cc.outputs.cc }}
       run: |
             make ENABLE_JIT=1 clean && make ENABLE_JIT=1 check -j$(nproc)
             make ENABLE_JIT=1 clean && make ENABLE_EXT_A=0 ENABLE_JIT=1 check -j$(nproc)
@@ -86,6 +110,8 @@ jobs:
             make clean && make ENABLE_UBSAN=1 check -j$(nproc)
             make ENABLE_JIT=1 clean && make ENABLE_JIT=1 ENABLE_UBSAN=1 check -j$(nproc)
     - name: boot Linux kernel test
+      env:
+        CC: ${{ steps.install_cc.outputs.cc }}
       run: |
             make clean && make ENABLE_SYSTEM=1 && make ENABLE_SYSTEM=1 artifact -j$(nproc)
             .ci/boot-linux.sh