ci: drop macos build

It's really getting in the way. It needs special care to be in sync with
Iain's own rebased branch.

Until it is easier to use, remove it from our CI.

ChangeLog:

	* .github/workflows/ccpp.yml (build-and-check-clang-macos): Remove.

Signed-off-by: Marc Poulhiès <[email protected]>

Author: dkm

.github/workflows/ccpp.yml

@@ -368,84 +368,6 @@ jobs:
               exit 0; \
             fi
 
-  build-and-check-clang-macos:
-
-    env:
-      # Force CC/CXX to be explicitly clang to make it clear which compiler is used
-      CC: clang
-      CXX: clang++
-
-    runs-on: macos-15
-
-    steps:
-    - uses: actions/checkout@v4
-      with:
-        fetch-depth: 0
-
-    - name: Handle ARM64
-      # TODO: update commit hash as required
-      #       it should be equivalent to the master-wip-apple-si branch
-      #       but, to keep things from breaking unexpectedly, the hash
-      #       is hardcoded.
-      run: |
-          git remote add arm-ian 'https://github.com/iains/gcc-darwin-arm64.git';
-          git fetch arm-ian;
-          GIT_AUTHOR_NAME=CI \
-          GIT_AUTHOR_EMAIL='ci@invalid' \
-          git merge --no-edit 5335688e426583c2f4703e25cc24c69cf74280ed;
-
-    - name: Install Deps
-      run: |
-          brew install dejagnu mpfr libmpc gmp;
-          # install Rust directly using rustup
-          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
-
-    - name: Make Source Read-Only
-      run: chmod -R a-w ./*
-
-    - name: Configure
-      run: |
-           mkdir -p gccrs-build;
-           cd gccrs-build;
-           ../configure \
-               --enable-languages=rust \
-               --disable-bootstrap \
-               --enable-multilib \
-               --with-gmp="$(brew --prefix gmp)" \
-               --with-mpfr="$(brew --prefix mpfr)" \
-               --with-mpc="$(brew --prefix libmpc)" \
-               --with-native-system-header-dir=/usr/include \
-               --with-sysroot=$(xcrun --show-sdk-path)
-
-    - name: Build
-      shell: bash
-      run: |
-           cd gccrs-build; \
-           make -j $(sysctl -n hw.ncpu) 2>&1 | tee log
-
-    - name: Run Tests
-      run: |
-           cd gccrs-build; \
-           make check-rust
-
-    - name: Archive check-rust results
-      uses: actions/upload-artifact@v4
-      with:
-        name: check-rust-logs-macos
-        path: |
-          gccrs-build/gcc/testsuite/rust/
-
-    - name: Check regressions
-      run: |
-           cd gccrs-build; \
-           if grep -e "unexpected" -e "unresolved" -e "ERROR:" gcc/testsuite/rust/rust.sum;\
-           then \
-              echo "::error title=Regression test failed::some tests are not correct"; \
-              exit 1; \
-            else \
-              exit 0; \
-            fi
-
   build-and-check-asan:
 
     env: