Fix indent issue and add required matrix attributes

.github/workflows/ci.yml

@@ -273,91 +273,95 @@ jobs:
       - name: Test
         run: C:\\tools\\cygwin\\bin\\bash -l -c 'cd $(cygpath -u "$GITHUB_WORKSPACE")/../boost-root/libs/math/test && ../../../b2 toolset=$TOOLSET ${{ matrix.suite }} define=CI_SUPPRESS_KNOWN_ISSUES define=SLOW_COMPILER'
   standalone-compile-tests-gcc:
-      runs-on: ubuntu-20.04
-      strategy:
-        fail-fast: false
-      steps:
-        - uses: actions/checkout@v2
-          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];[cygwin];[CYGWIN]'
-            commit-filter-separator: ';'
-            fail-fast: true
-        - name: Add repository
-          continue-on-error: true
-          id: addrepo
-          run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
-        - name: Retry Add Repo
-          continue-on-error: true
-          id: retry1
-          if: steps.addrepo.outcome=='failure'
-          run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
-        - name: Retry Add Repo 2
-          continue-on-error: true
-          id: retry2
-          if: steps.retry1.outcome=='failure'
-          run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
-        - name: Install packages
-          run: sudo apt install g++-10 libgmp-dev libmpfr-dev libfftw3-dev
-        - name: Checkout main boost
-          run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
-        - name: Update tools/boostdep
-          run: git submodule update --init tools/boostdep
-          working-directory: ../boost-root
-        - name: Copy files
-          run: cp -r $GITHUB_WORKSPACE/* libs/math
-          working-directory: ../boost-root
-        - name: Run CMake
-          run: cmake -DBUILD_TESTING=1 -DCMAKE_CXX_COMPILER=g++-10 .
-          working-directory: ../boost-root/libs/math
-        - name: Run Compile Tests
-          run: make -j$((`nproc`+1))
-          working-directory: ../boost-root/libs/math
+    runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: false
+      matrix:
+        compiler: [ g++-10 ]
+    steps:
+      - uses: actions/checkout@v2
+        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];[cygwin];[CYGWIN]'
+          commit-filter-separator: ';'
+          fail-fast: true
+      - name: Add repository
+        continue-on-error: true
+        id: addrepo
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Retry Add Repo
+        continue-on-error: true
+        id: retry1
+        if: steps.addrepo.outcome=='failure'
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Retry Add Repo 2
+        continue-on-error: true
+        id: retry2
+        if: steps.retry1.outcome=='failure'
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Install packages
+        run: sudo apt install g++-10 libgmp-dev libmpfr-dev libfftw3-dev
+      - name: Checkout main boost
+        run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
+      - name: Update tools/boostdep
+        run: git submodule update --init tools/boostdep
+        working-directory: ../boost-root
+      - name: Copy files
+        run: cp -r $GITHUB_WORKSPACE/* libs/math
+        working-directory: ../boost-root
+      - name: Run CMake
+        run: cmake -DBUILD_TESTING=1 -DCMAKE_CXX_COMPILER=g++-10 .
+        working-directory: ../boost-root/libs/math
+      - name: Run Compile Tests
+        run: make -j$((`nproc`+1))
+        working-directory: ../boost-root/libs/math
   standalone-compile-tests-clang:
-      runs-on: ubuntu-20.04
-      strategy:
-        fail-fast: false
-      steps:
-        - uses: actions/checkout@v2
-          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];[cygwin];[CYGWIN]'
-            commit-filter-separator: ';'
-            fail-fast: true
-        - name: Add repository
-          continue-on-error: true
-          id: addrepo
-          run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
-        - name: Retry Add Repo
-          continue-on-error: true
-          id: retry1
-          if: steps.addrepo.outcome=='failure'
-          run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
-        - name: Retry Add Repo 2
-          continue-on-error: true
-          id: retry2
-          if: steps.retry1.outcome=='failure'
-          run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
-        - name: Install packages
-          run: sudo apt install clang-10 libgmp-dev libmpfr-dev libfftw3-dev
-        - name: Checkout main boost
-          run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
-        - name: Update tools/boostdep
-          run: git submodule update --init tools/boostdep
-          working-directory: ../boost-root
-        - name: Copy files
-          run: cp -r $GITHUB_WORKSPACE/* libs/math
-          working-directory: ../boost-root
-        - name: Run CMake
-          run: cmake -DBUILD_TESTING=1 -DCMAKE_CXX_COMPILER=clang++-10 .
-          working-directory: ../boost-root/libs/math
-        - name: Run Compile Tests
-          run: make -j$((`nproc`+1))
-          working-directory: ../boost-root/libs/math
+    runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: false
+      matrix:
+        compiler: [ clang++-10 ]
+    steps:
+      - uses: actions/checkout@v2
+        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];[cygwin];[CYGWIN]'
+          commit-filter-separator: ';'
+          fail-fast: true
+      - name: Add repository
+        continue-on-error: true
+        id: addrepo
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Retry Add Repo
+        continue-on-error: true
+        id: retry1
+        if: steps.addrepo.outcome=='failure'
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Retry Add Repo 2
+        continue-on-error: true
+        id: retry2
+        if: steps.retry1.outcome=='failure'
+        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+      - name: Install packages
+        run: sudo apt install clang-10 libgmp-dev libmpfr-dev libfftw3-dev
+      - name: Checkout main boost
+        run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
+      - name: Update tools/boostdep
+        run: git submodule update --init tools/boostdep
+        working-directory: ../boost-root
+      - name: Copy files
+        run: cp -r $GITHUB_WORKSPACE/* libs/math
+        working-directory: ../boost-root
+      - name: Run CMake
+        run: cmake -DBUILD_TESTING=1 -DCMAKE_CXX_COMPILER=clang++-10 .
+        working-directory: ../boost-root/libs/math
+      - name: Run Compile Tests
+        run: make -j$((`nproc`+1))
+        working-directory: ../boost-root/libs/math
   standalone-gcc:
     runs-on: ubuntu-20.04
     strategy: