Merge #159: cmake, ci: Bump clang version to 15

8fd40d4 fixup! ci: Test CMake edge cases (Hennadii Stepanov)
c08acdb fixup! ci: Test CMake edge cases (Hennadii Stepanov)

Pull request description:

  See bitcoin#29165.

ACKs for top commit:
  m3dwards:
    utACK 8fd40d4

Tree-SHA512: 4f74730de2de7767875357044763f9aa73ba0e973a9af2572989f51bf631cd082279f08b7141ef8e56765cecf327ee31406bd83d05eb2a5125d520f773d0210f

.github/workflows/cmake.yml

@@ -231,7 +231,7 @@ jobs:
 
       - name: Generate build system
         run: |
-          cmake -B build --preset ci-linux -DCMAKE_C_COMPILER=gcc-11 -DCMAKE_CXX_COMPILER=g++-11 -DBoost_INCLUDE_DIR="${PWD}/${{ matrix.conf.boost_archive }}"
+          cmake -B build --preset ci-linux -DBoost_INCLUDE_DIR="${PWD}/${{ matrix.conf.boost_archive }}"
 
       - name: Build
         working-directory: build
@@ -273,12 +273,10 @@ jobs:
         host:
           - name: 'Linux 32-bit, Clang, link to libatomic'
             triplet: 'i686-pc-linux-gnu'
-            packages: 'clang-14 g++-multilib'
-            c_compiler: 'clang-14 -m32'
-            cxx_compiler: 'clang++-14 -m32'
+            packages: 'clang-15 g++-multilib'
+            c_compiler: 'clang-15 -m32'
+            cxx_compiler: 'clang++-15 -m32'
             depends_options: ''
-            # For -Wno-error=unreachable-code, please refer to https://github.com/bitcoin/bitcoin/issues/29334
-            configure_env: 'env CXXFLAGS="-Wno-error=unreachable-code"'
             configure_options: '-DWERROR=ON'
           - name: 'Linux 64-bit, multiprocess'
             triplet: 'x86_64-pc-linux-gnu'
@@ -376,7 +374,7 @@ jobs:
 
       - name: Generate build system
         run: |
-          ${{ matrix.host.configure_env }} cmake -B build --toolchain depends/${{ matrix.host.triplet }}/toolchain.cmake ${{ matrix.host.configure_options }}
+          cmake -B build --toolchain depends/${{ matrix.host.triplet }}/toolchain.cmake ${{ matrix.host.configure_options }}
 
       - name: Build
         run: |
@@ -533,11 +531,6 @@ jobs:
           - name: 'macOS 14 native, arm64'
             os: macos-14
         xcode:
-          - name: 'Xcode 14.3'
-            id: 'xcode-14.3'
-            path: '/Applications/Xcode_14.3.app'
-            # For -Wno-error=unreachable-code, please refer to https://github.com/bitcoin/bitcoin/issues/29334
-            configure_env: 'env CXXFLAGS="-Wno-error=unreachable-code"'
           - name: 'Xcode 15.2'
             id: 'xcode-15.2'
             path: '/Applications/Xcode_15.2.app'
@@ -580,7 +573,7 @@ jobs:
 
       - name: Generate build system
         run: |
-          ${{ matrix.xcode.configure_env }} cmake -B build --preset ci-darwin
+          cmake -B build --preset ci-darwin
 
       - name: Build
         env: