Disable ranges on MacOS.

Remove CUDA testing - I just can't get CUDA to install any more.

.github/workflows/ci.yml

@@ -527,61 +527,3 @@ jobs:
          source ../emsdk/emsdk_env.sh
          emcc -pthread -s EXIT_RUNTIME=1 -s PTHREAD_POOL_SIZE=32 -s DISABLE_EXCEPTION_CATCHING=0 -I. -O3 -o config_test_pthread libs/config/test/config_test.cpp
          node --experimental-wasm-threads config_test_pthread
-  ubuntu-cuda:
-    runs-on: ubuntu-24.04
-    strategy:
-      fail-fast: false
-      matrix:
-        std: [ 11 ]
-    steps:
-      - uses: actions/checkout@v3
-        with:
-          fetch-depth: '0'
-      - uses: mstachniuk/ci-skip@v1
-        with:
-          commit-filter: '[skip ci];[ci skip];[CI SKIP];[SKIP CI];***CI SKIP***;***SKIP CI***;[windows];[Windows];[WINDOWS];[apple];[Apple];[APPLE]'
-          commit-filter-separator: ';'
-          fail-fast: true
-      - name: Add repository
-        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
-      - name: Install packages
-        run: sudo apt install g++ clang
-      - uses: Jimver/cuda-toolkit@master
-        id: cuda-toolkit
-        with:
-          log-file-suffix: '${{matrix.std}}.txt'
-      - name: Checkout main boost
-        run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
-      - name: Update Dependencies
-        run: git submodule update --init tools/build tools/boost_install libs/headers libs/detail libs/core libs/assert libs/type_traits libs/static_assert libs/throw_exception libs/preprocessor
-        working-directory: ../boost-root
-      - name: Copy files
-        run: cp -r $GITHUB_WORKSPACE/* libs/config
-        working-directory: ../boost-root
-      - name: Bootstrap
-        run: ./bootstrap.sh
-        working-directory: ../boost-root
-      - name: Generate headers
-        run: ./b2 headers
-        working-directory: ../boost-root
-      - name: nvcc version
-        run: nvcc --version
-        working-directory: ../boost-root/libs/config/test
-      - name: Config info nvcc
-        run: nvcc -std=c++${{ matrix.std }} -o config_info -I../../.. config_info.cpp && ./config_info
-        working-directory: ../boost-root/libs/config/test
-      - name: Config_test nvcc
-        run: nvcc -std=c++${{ matrix.std }} -o config_test -I../../.. config_test.cpp && ./config_test
-        working-directory: ../boost-root/libs/config/test
-      - name: Config_test nvcc-cuda
-        run: nvcc -c -std=c++${{ matrix.std }} -I../../.. config_test.cu
-        working-directory: ../boost-root/libs/config/test
-      - name: Config info nvcc+clang
-        run: nvcc -std=c++${{ matrix.std }} --compiler-bindir=clang++ -o config_info -I../../.. config_info.cpp && ./config_info
-        working-directory: ../boost-root/libs/config/test
-      - name: Config_test nvcc+clang
-        run: nvcc -std=c++${{ matrix.std }} --compiler-bindir=clang++ -o config_test -I../../.. config_test.cpp  -latomic && ./config_test
-        working-directory: ../boost-root/libs/config/test
-      - name: Config_test clang-cuda
-        run: clang++ -nocudalib --no-cuda-version-check -c --cuda-gpu-arch=sm_75 -std=c++${{ matrix.std }} -I../../.. config_test.cu
-        working-directory: ../boost-root/libs/config/test

include/boost/config/stdlib/libcpp.hpp

@@ -177,4 +177,9 @@
 #endif
 #endif
 
+#if _LIBCPP_VERSION <= 170006
+// no std::ranges::join_view
+#  define BOOST_NO_CXX20_HDR_RANGES
+#endif
+
 //  --- end ---