diff --git a/.github/workflows/cxx.yml b/.github/workflows/cxx.yml
new file mode 100644
index 0000000000..cb65a90bd9
--- /dev/null
+++ b/.github/workflows/cxx.yml
@@ -0,0 +1,247 @@
+# Github action to test for C++ interoperability
+#
+# This file is modeled after DMD's Github action definition (`runnable_cxx.yml`).
+# Its goal is to test interaction with the C++ standard library on multiple platforms.
+# Look up the DMD file for more information about reasoning, patterns, caveats, etc...
+#
+# TODO:
+# - Implement Windows + MSVC support
+# - Implement Windows + clang support
+# - Implement Linux + Clang 32 bits support (if possible)
+name: stdcpp
+
+on:
+  pull_request:
+    branches:
+      - master
+      - stable
+  push:
+    branches:
+      - master
+      - stable
+      # Use this branch name in your fork to test changes
+      - github-actions
+
+jobs:
+  main:
+    name: Run
+    strategy:
+      fail-fast: false
+      # Matches the matrix in DMD to support the same platforms
+      matrix:
+        os: [ macOS-10.15, ubuntu-16.04, windows-2019 ]
+        target: [
+          clang-9.0.0, clang-8.0.0, clang-7.0.0,
+          clang-6.0.0,  clang-5.0.2, clang-4.0.0, clang-3.9.0,
+          g++-9, g++-8, g++-7, g++-6, g++-5,
+          msvc-2019, msvc-2017, msvc-2015, msvc-2013
+        ]
+
+        exclude:
+          # Ubuntu supports clang and g++
+          - { os: ubuntu-16.04, target: msvc-2019 }
+          - { os: ubuntu-16.04, target: msvc-2017 }
+          - { os: ubuntu-16.04, target: msvc-2015 }
+          - { os: ubuntu-16.04, target: msvc-2013 }
+          # FIXME: Can't test clang+Linux because DMD assume g++
+          - { os: ubuntu-16.04, target: clang-9.0.0 }
+          - { os: ubuntu-16.04, target: clang-8.0.0 }
+          - { os: ubuntu-16.04, target: clang-7.0.0 }
+          - { os: ubuntu-16.04, target: clang-6.0.0 }
+          - { os: ubuntu-16.04, target: clang-5.0.2 }
+          - { os: ubuntu-16.04, target: clang-4.0.0 }
+          - { os: ubuntu-16.04, target: clang-3.9.0 }
+          # OSX only supports clang
+          - { os: macOS-10.15, target: g++-9 }
+          - { os: macOS-10.15, target: g++-8 }
+          - { os: macOS-10.15, target: g++-7 }
+          - { os: macOS-10.15, target: g++-6 }
+          - { os: macOS-10.15, target: g++-5 }
+          - { os: macOS-10.15, target: msvc-2019 }
+          - { os: macOS-10.15, target: msvc-2017 }
+          - { os: macOS-10.15, target: msvc-2015 }
+          - { os: macOS-10.15, target: msvc-2013 }
+          # We don't test g++ on Windows as DMD only mangles for MSVC
+          - { os: windows-2019, target: g++-9 }
+          - { os: windows-2019, target: g++-8 }
+          - { os: windows-2019, target: g++-7 }
+          - { os: windows-2019, target: g++-6 }
+          - { os: windows-2019, target: g++-5 }
+
+          # TODO: Implement support for clang and MSVC on Windows
+          # Currently those are still being run by the auto-tester
+          - os: windows-2019
+
+        include:
+          # Clang boilerplate
+          - { target: clang-9.0.0, compiler: clang, cxx-version: 9.0.0 }
+          - { target: clang-8.0.0, compiler: clang, cxx-version: 8.0.0 }
+          - { target: clang-7.0.0, compiler: clang, cxx-version: 7.0.0 }
+          - { target: clang-6.0.0, compiler: clang, cxx-version: 6.0.0 }
+          - { target: clang-5.0.2, compiler: clang, cxx-version: 5.0.2 }
+          - { target: clang-4.0.0, compiler: clang, cxx-version: 4.0.0 }
+          - { target: clang-3.9.0, compiler: clang, cxx-version: 3.9.0 }
+          # g++ boilerplace
+          - { target: g++-9, compiler: g++, cxx-version: 9.3.0 }
+          - { target: g++-8, compiler: g++, cxx-version: 8.4.0 }
+          - { target: g++-7, compiler: g++, cxx-version: 7.5.0 }
+          - { target: g++-6, compiler: g++, cxx-version: 6.5.0 }
+          - { target: g++-5, compiler: g++, cxx-version: 5.5.0 }
+          # Platform boilerplate
+          - { os: ubuntu-16.04, arch: x86_64-linux-gnu-ubuntu-16.04 }
+          - { os: macOS-10.15,  arch: x86_64-apple-darwin }
+          # Clang 9.0.0 have a different arch for OSX
+          - { os: macOS-10.15, target: clang-9.0.0, arch: x86_64-darwin-apple }
+
+    runs-on: ${{ matrix.os }}
+    steps:
+
+    ########################################
+    #    Setting up the host D compiler    #
+    ########################################
+    - name: Prepare compiler
+      uses: mihails-strasuns/setup-dlang@v0.5.0
+      with:
+          compiler: dmd-2.091.0
+          gh_token: ${{ secrets.GITHUB_TOKEN }}
+
+    #########################################
+    # Checking out up DMD, druntime, Phobos #
+    #########################################
+    - name: Checkout DMD
+      uses: actions/checkout@v2
+      with:
+        path: dmd
+        repository: dlang/dmd
+        ref: ${{ github.base_ref }}
+        persist-credentials: false
+    - name: Checkout druntime
+      uses: actions/checkout@v2
+      with:
+        path: druntime
+        persist-credentials: false
+    - name: Checkout Phobos
+      uses: actions/checkout@v2
+      with:
+        path: phobos
+        repository: dlang/phobos
+        ref: ${{ github.base_ref }}
+        persist-credentials: false
+
+
+    ########################################
+    #   Setting up the host C++ compiler   #
+    ########################################
+    - name: '[Posix] Setting up clang ${{ matrix.cxx-version }}'
+      if: matrix.compiler == 'clang' && runner.os != 'Windows'
+      run: |
+        wget --quiet --directory-prefix=${{ github.workspace }} https://releases.llvm.org/${{ matrix.cxx-version }}/clang+llvm-${{ matrix.cxx-version }}-${{ matrix.arch }}.tar.xz
+        tar -x -C ${{ github.workspace }} -f ${{ github.workspace }}/clang+llvm-${{ matrix.cxx-version }}-${{ matrix.arch }}.tar.xz
+        TMP_CC='${{ github.workspace }}/clang+llvm-${{ matrix.cxx-version }}-${{ matrix.arch }}/bin/clang'
+        # On OSX, the system header are installed via `xcode-select` and not distributed with clang
+        # Since some part of the testsuite rely on CC being only a binary (not a command),
+        # and config files where only introduced from 6.0.0, use a wrapper script.
+        if [ "${{ matrix.os }}" == "macOS-10.15" ]; then
+          # Note: heredoc shouldn't be indented
+          cat <<EOF > ${TMP_CC}-wrapper
+        #!/bin/bash
+        ${TMP_CC} -isystem /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/ \$@
+        EOF
+          # Invoking clang with `clang++` will link the C++ standard library
+          # Make sure we got two separate wrapper for this
+          cat <<EOF > ${TMP_CC}++-wrapper
+        #!/bin/bash
+        ${TMP_CC}++ -isystem /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/ \$@
+        EOF
+          chmod +x ${TMP_CC}-wrapper ${TMP_CC}++-wrapper
+          echo ::set-env name=CC::${TMP_CC}-wrapper
+          echo ::set-env name=CXX::${TMP_CC}++-wrapper
+        else
+          # Note: druntime's tests use `CXX` and DMD uses `CC`
+          echo ::set-env name=CC::${TMP_CC}
+          echo ::set-env name=CXX::${TMP_CC}++
+        fi
+
+    # On OSX and Linux, clang is installed by default and in the path,
+    # so make sure ${CC} works
+    - name: '[Posix] Verifying installed clang version'
+      if: matrix.compiler == 'clang' && runner.os != 'Windows'
+      run: |
+        set -e
+        if ${CXX} --version | grep -q 'version ${{ matrix.cxx-version }}'; then
+          ${CXX} --version
+          ${CXX} -print-search-dirs -print-libgcc-file-name
+        else
+            echo "Expected version ${{ matrix.cxx-version }}, from '${CC}', got:"
+            ${CXX} --version
+            exit 1
+        fi
+
+    # G++ is only supported on Linux
+    - name: '[Linux] Setting up g++ ${{ matrix.cxx-version }}'
+      if: matrix.compiler == 'g++'
+      run: |
+        # Workaround bug in Github actions
+        curl https://cli-assets.heroku.com/apt/release.key | sudo apt-key add -
+        # Make sure we have the essentials
+        sudo apt-get update
+        sudo apt-get install build-essential software-properties-common -y
+        # This ppa provides multiple versions of g++
+        sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
+        sudo apt-get update
+        sudo apt-get install ${{ matrix.target }} ${{ matrix.target }}-multilib
+        echo ::set-env name=CC::${{ matrix.target }}
+        echo ::set-env name=CXX::${{ matrix.target }}
+
+    # Make sure ${CC} works and we don't use the $PATH one
+    - name: '[Linux] Verifying installed g++ version'
+      if: matrix.compiler == 'g++'
+      run: |
+        set -e
+        if ${CXX} --version | grep -q '${{ matrix.target }} (Ubuntu '; then
+          ${CXX} --version
+        else
+            echo "Expected version ${{ matrix.target }}, from '${CXX}', got:"
+            ${CXX} --version
+            exit 1
+        fi
+
+    ########################################
+    #    Building DMD, druntime, Phobos    #
+    ########################################
+    - name: '[Posix] Build compiler & standard library'
+      run: |
+        # All hosts are 64 bits but let's be explicit
+        ./dmd/src/build.d -j2 MODEL=64
+        make -C druntime -f posix.mak -j2 MODEL=64
+        make -C phobos   -f posix.mak -j2 MODEL=64
+        # Both version can live side by side (they end up in a different directory)
+        # However, since clang does not provide a multilib package, only test 32 bits with g++
+        if [ ${{ matrix.compiler }} == "g++" ]; then
+          ./dmd/src/build.d -j2 MODEL=32
+          make -C druntime -f posix.mak -j2 MODEL=32
+          make -C phobos   -f posix.mak -j2 MODEL=32
+        fi
+
+    ########################################
+    #        Running the test suite        #
+    ########################################
+    - name: Run C++ test suite
+      run: |
+        make -C druntime -f posix.mak test/stdcpp/.run MODEL=64
+        if [ ${{ matrix.compiler }} == "g++" ]; then
+          ./dmd/test/run.d clean
+          make -C druntime -f posix.mak test/stdcpp/.run MODEL=32
+        fi
+
+    ########################################
+    #     Dump symbols on link failure     #
+    ########################################
+    - name: '[Posix,Fail] Dump C++ / D binary symbols'
+      if: failure() && runner.os != 'Windows'
+      run: |
+        ls -l druntime/generated/*/release/*/
+        for file in druntime/generated/*/release/*/*.o*; do
+          echo "========== Symbols for '$file' =========="
+          nm $file
+        done
diff --git a/posix.mak b/posix.mak
index b3b80a1311..6d9833a197 100644
--- a/posix.mak
+++ b/posix.mak
@@ -51,7 +51,7 @@ endif
 ifeq (osx,$(OS))
 	DOTDLL:=.dylib
 	DOTLIB:=.a
-	export MACOSX_DEPLOYMENT_TARGET=10.7
+	export MACOSX_DEPLOYMENT_TARGET=10.9
 else
 	DOTDLL:=.so
 	DOTLIB:=.a
diff --git a/test/common.mak b/test/common.mak
index eb1839eab1..b4ea48f4eb 100644
--- a/test/common.mak
+++ b/test/common.mak
@@ -30,7 +30,3 @@ else
 endif
 CXXFLAGS_BASE := $(CFLAGS_BASE)
 CXXFLAGS:=$(CFLAGS)
-ifeq (osx,$(OS))
-	CXXFLAGS+=-stdlib=libc++
-	CXXFLAGS_BASE+=-stdlib=libc++
-endif
diff --git a/test/stdcpp/Makefile b/test/stdcpp/Makefile
index 4ade1458cb..4bed868171 100644
--- a/test/stdcpp/Makefile
+++ b/test/stdcpp/Makefile
@@ -29,14 +29,6 @@ endif
 
 .PHONY: all clean
 
-# osx32 does not link properly, nobody uses it anyway...
-ifeq ($(OS)$(MODEL), osx32)
-
-all:
-
-clean:
-
-else
 all: $(addprefix $(ROOT)/,$(addsuffix .done,$(TESTS))) $(addprefix $(ROOT)/,$(addsuffix _11.done,$(TESTS11))) $(addprefix $(ROOT)/,$(addsuffix _17.done,$(TESTS17))) $(addprefix $(ROOT)/,$(addsuffix _old.done,$(OLDABITESTS))) $(addprefix $(ROOT)/,$(addsuffix _libcpp.done,$(LIBCPPTESTS)))
 
 # run C++98 tests
@@ -83,4 +75,3 @@ $(ROOT)/%_old: $(SRC)/%.cpp $(SRC)/%_test.d
 
 clean:
 	rm -rf $(GENERATED)
-endif