Test libc++ in ci.yml

Author: pdimov

.github/workflows/ci.yml

@@ -59,130 +59,149 @@ jobs:
             install: g++-12
           - toolset: gcc-13
             cxxstd: "11,14,17,20,2b"
-            os: ubuntu-latest
             container: ubuntu:24.04
+            os: ubuntu-latest
             install: g++-13
           - toolset: gcc-14
             cxxstd: "11,14,17,20,2b"
-            os: ubuntu-latest
             container: ubuntu:24.04
+            os: ubuntu-latest
             install: g++-14
           - toolset: gcc-15
             cxxstd: "11,14,17,20,23,2c"
-            os: ubuntu-latest
             container: ubuntu:25.04
+            os: ubuntu-latest
             install: g++-15
           - toolset: clang
             compiler: clang++-3.9
             cxxstd: "11,14"
-            os: ubuntu-latest
+            stdlib: "gnu11,libc++"
             container: ubuntu:18.04
+            os: ubuntu-latest
             install: clang-3.9
           - toolset: clang
             compiler: clang++-4.0
             cxxstd: "11,14"
-            os: ubuntu-latest
+            stdlib: "gnu11,libc++"
             container: ubuntu:18.04
+            os: ubuntu-latest
             install: clang-4.0
           - toolset: clang
             compiler: clang++-5.0
             cxxstd: "11,14,1z"
-            os: ubuntu-latest
+            stdlib: "gnu11,libc++"
             container: ubuntu:18.04
+            os: ubuntu-latest
             install: clang-5.0
           - toolset: clang
             compiler: clang++-6.0
             cxxstd: "11,14,17"
+            stdlib: "gnu11,libc++"
             container: ubuntu:20.04
             os: ubuntu-latest
             install: clang-6.0
           - toolset: clang
             compiler: clang++-7
             cxxstd: "11,14,17"
+            stdlib: "gnu11,libc++"
             container: ubuntu:20.04
             os: ubuntu-latest
             install: clang-7
           - toolset: clang
             compiler: clang++-8
             cxxstd: "11,14,17"
+            stdlib: "gnu11,libc++"
             container: ubuntu:20.04
             os: ubuntu-latest
             install: clang-8
           - toolset: clang
             compiler: clang++-9
             cxxstd: "11,14,17"
+            stdlib: "gnu11,libc++"
             container: ubuntu:20.04
             os: ubuntu-latest
             install: clang-9
           - toolset: clang
             compiler: clang++-10
             cxxstd: "11,14,17,2a"
+            stdlib: "gnu11,libc++"
             container: ubuntu:20.04
             os: ubuntu-latest
             install: clang-10
           - toolset: clang
             compiler: clang++-11
             cxxstd: "11,14,17,2a"
+            stdlib: "gnu11,libc++"
             container: ubuntu:20.04
             os: ubuntu-latest
             install: clang-11
           - toolset: clang
             compiler: clang++-12
             cxxstd: "11,14,17,20"
+            stdlib: "gnu11,libc++"
             container: ubuntu:20.04
             os: ubuntu-latest
             install: clang-12
           - toolset: clang
             compiler: clang++-13
             cxxstd: "11,14,17,20,2b"
+            stdlib: "gnu11,libc++"
             container: ubuntu:22.04
             os: ubuntu-latest
             install: clang-13
           - toolset: clang
             compiler: clang++-14
             cxxstd: "11,14,17,20,2b"
+            stdlib: "gnu11,libc++"
             container: ubuntu:22.04
             os: ubuntu-latest
             install: clang-14
           - toolset: clang
             compiler: clang++-15
             cxxstd: "11,14,17,20,2b"
             container: ubuntu:22.04
+            stdlib: "gnu11,libc++"
             os: ubuntu-latest
             install: clang-15
           - toolset: clang
             compiler: clang++-16
             cxxstd: "11,14,17,20,2b"
+            stdlib: "gnu11,libc++"
             container: ubuntu:24.04
             os: ubuntu-latest
             install: clang-16
           - toolset: clang
             compiler: clang++-17
             cxxstd: "11,14,17,20,2b"
+            stdlib: "gnu11,libc++"
             container: ubuntu:24.04
             os: ubuntu-latest
             install: clang-17
           - toolset: clang
             compiler: clang++-18
             cxxstd: "11,14,17,20,2b"
+            stdlib: "gnu11,libc++"
             container: ubuntu:24.04
             os: ubuntu-latest
             install: clang-18
           - toolset: clang
             compiler: clang++-19
             cxxstd: "11,14,17,20,2b"
+            stdlib: "gnu11,libc++"
             container: ubuntu:24.04
             os: ubuntu-latest
             install: clang-19
           - toolset: clang
             compiler: clang++-20
             cxxstd: "11,14,17,20,23,2c"
+            stdlib: "gnu11,libc++"
             container: ubuntu:24.04
             os: ubuntu-latest
             install: clang-20
           - toolset: clang
             compiler: clang++-21
             cxxstd: "11,14,17,20,23,2c"
+            stdlib: "gnu11,libc++"
             container: ubuntu:25.10
             os: ubuntu-latest
             install: clang-21
@@ -260,7 +279,7 @@ jobs:
       - name: Run tests
         run: |
           cd ../boost-root
-          ./b2 -j3 libs/$LIBRARY/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} variant=debug,release
+          ./b2 -j3 libs/$LIBRARY/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} variant=debug,release ${{ matrix.stdlib && format('stdlib={0}', matrix.stdlib) }}
 
   windows:
     strategy: