diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c6e6519b7..076c322a7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -3,58 +3,228 @@ name: CI
 on:
   push:
     branches: master
+    paths-ignore:
+      - 'CHANGES*'
+      - 'Doc/**'
   pull_request:
     branches: master
+    paths-ignore:
+      - 'CHANGES*'
+      - 'Doc/**'
 
 jobs:
   build:
 
-    runs-on: ${{ matrix.os }}
+    runs-on: ${{ matrix.os || 'ubuntu-20.04' }}
+
+    # By default, the name of the build is just the language used, but matrix
+    # entries can define the additional "desc" field with any additional
+    # information to include in the name.
+    name: ${{ matrix.SWIGLANG || 'none' }}${{ matrix.PY3 }} ${{ matrix.ENGINE}} ${{ matrix.VER }} ${{ matrix.desc }}
+
     strategy:
       matrix:
-        #SWIGJOBS: ["-j2"]
-        # other variables to optionally set
-        # CC, GCC (used as suffix)
-        # CPP11, CPP14, CPP17
-        # CONFIGOPTS
-        # SWIGLANG
-        # PY3,VER
-        # SWIG_FEATURES
         include:
-        - os: ubuntu-latest
+        - SWIGLANG: ""
+          desc: gcc
+        - SWIGLANG: ""
+          GCC: 7
+          desc: gcc7
+        - SWIGLANG: ""
+          GCC: 8
+          desc: gcc8
+        - SWIGLANG: ""
+          GCC: 9
+          desc: gcc9
+        - SWIGLANG: ""
+          GCC: 10
+          desc: gcc10
+        - SWIGLANG: ""
+          compiler: clang
+          desc: clang
+        - SWIGLANG: csharp
+        # D support can't be enabled because dmd 2.066 fails to build anything
+        # under Ubuntu 18.04 due to its standard library (libphobos2.a) not
+        # being compiled with -FPIC, but system gcc using -fpie by default,
+        # resulting in linking errors for any output. And later versions, such
+        # as 2.086.1, are not supported and result in errors in SWIG test suite.
+        #
+        # - SWIGLANG: d
+        #   VER: '2.066.0'
+        #   os: ubuntu-18.04 # This dlang version doesn't work under 20.04.
+        - SWIGLANG: go
+          VER: '1.3'
+        - SWIGLANG: go
+          VER: '1.6'
+        - SWIGLANG: go
+          VER: '1.8'
+        - SWIGLANG: go
+          VER: '1.12'
+          CSTD: gnu99
+        - SWIGLANG: go
+          VER: '1.16'
+          CSTD: gnu99
+        - SWIGLANG: guile
+        - SWIGLANG: java
+        - SWIGLANG: javascript
+          ENGINE: node
+          VER: '12'
           CPP11: 1
-          SWIGLANG: ""
-        - os: ubuntu-latest
+        - SWIGLANG: javascript
+          ENGINE: node
+          VER: '14'
           CPP11: 1
-          SWIGLANG: python
-        - os: ubuntu-latest
+        - SWIGLANG: javascript
+          ENGINE: node
+          VER: '16'
+          CPP14: 1
+        - SWIGLANG: javascript
+          ENGINE: jsc
+          os: ubuntu-18.04 # libwebkitgtk-dev dependency not available in 20.04.
+        - SWIGLANG: javascript
+          ENGINE: v8
+          os: ubuntu-18.04 # libv8-dev only actually provides v8 in 18.04.
+        - SWIGLANG: lua
+        - SWIGLANG: lua
+          VER: '5.3'
+        - SWIGLANG: octave
           CPP11: 1
-          SWIGLANG: python
+        - SWIGLANG: perl5
+        - SWIGLANG: php
+          VER: '7.4'
+        - SWIGLANG: php
+          VER: '8.0'
+        - SWIGLANG: python
+        - SWIGLANG: python
           PY3: 3
-        - os: ubuntu-latest
+          VER: '3.2'
+          os: ubuntu-18.04 # Python < 3.5 not available for 20.04.
+        - SWIGLANG: python
+          PY3: 3
+          VER: '3.3'
+          os: ubuntu-18.04 # Python < 3.5 not available for 20.04.
+        - SWIGLANG: python
+          PY3: 3
+          VER: '3.4'
+          os: ubuntu-18.04 # Python < 3.5 not available for 20.04.
+        - SWIGLANG: python
+          PY3: 3
+          VER: '3.5'
+        - SWIGLANG: python
+          PY3: 3
+          VER: '3.6'
+        - SWIGLANG: python
+          PY3: 3
+          VER: '3.7'
+        - SWIGLANG: python
+          PY3: 3
+          VER: '3.8'
+        - SWIGLANG: python
+          PY3: 3
+          VER: '3.9'
+        - SWIGLANG: python
+          SWIG_FEATURES: -builtin
+          desc: builtin
+        - SWIGLANG: python
+          SWIG_FEATURES: -builtin -O
+          desc: builtin optimized
+        - SWIGLANG: python
+          PY3: 3
+          SWIG_FEATURES: -builtin
+          desc: builtin
+        - SWIGLANG: python
+          PY3: 3
+          SWIG_FEATURES: -builtin -O
+          desc: builtin optimized
+        - SWIGLANG: r
+        - SWIGLANG: ruby
+          VER: '1.9'
+          os: ubuntu-18.04
+        - SWIGLANG: ruby
+          VER: '2.0'
+          os: ubuntu-18.04
+        - SWIGLANG: ruby
+          VER: '2.1'
+          os: ubuntu-18.04
+        - SWIGLANG: ruby
+          VER: '2.2'
+          os: ubuntu-18.04
+        - SWIGLANG: ruby
+          VER: '2.3'
+          os: ubuntu-18.04
+        - SWIGLANG: ruby
+          VER: '2.4'
+        - SWIGLANG: ruby
+          VER: '2.5'
+        - SWIGLANG: ruby
+          VER: '2.6'
+        - SWIGLANG: ruby
+          VER: '2.7'
+        - SWIGLANG: ruby
+          VER: '3.0'
+          CSTD: c99
           CPP11: 1
-          SWIGLANG: tcl
+        - SWIGLANG: tcl
         # let's run all of them, as opposed to aborting when one fails
       fail-fast: false
 
+    env:
+      SWIGLANG: ${{ matrix.SWIGLANG }}
+      PY3: ${{ matrix.PY3 }}
+      VER: ${{ matrix.VER }}
+      ENGINE: ${{ matrix.ENGINE }}
+      SWIG_FEATURES: ${{ matrix.SWIG_FEATURES }}
+      CSTD: ${{ matrix.CSTD }}
+      CPP11: ${{ matrix.CPP11 }}
+      CPP14: ${{ matrix.CPP14 }}
+      CPP17: ${{ matrix.CPP17 }}
+
     steps:
-    - uses: actions/checkout@v2
+    - name: Checkout
+      uses: actions/checkout@v2
       with:
         submodules: recursive
-    - name: ccache
+
+    - name: Install CCache
       uses: hendrikmuhs/ccache-action@v1
       with:
-        key: ${{ matrix.os }}-${{ matrix.SWIGLANG }}
-    - name: configure
-      shell: bash
-      env:
-          SWIGLANG: ${{ matrix.SWIGLANG }}
-          CONFIGOPTS: ${{ matrix.CONFIGOPTS }}
-          CC: ${{ matrix.CC }}
+        key: ${{ matrix.os || 'ubuntu-20.04' }}-${{ matrix.compiler || 'gcc' }}${{ matrix.GCC }}
+
+    - name: Configure
       run: |
-          set -ex
+          set -x
           export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+          echo PATH="$PATH" >> $GITHUB_ENV
+
           source Tools/GHA-linux-install.sh
+
+          if test '${{ matrix.compiler }}' = 'clang'; then
+            CC="clang"
+            CXX="clang++"
+
+            CFLAGS="$CFLAGS -fPIE"
+            CXXFLAGS="$CXXFLAGS -fPIE"
+          elif test -n "$GCC"; then
+            CC="gcc-$GCC"
+            CXX="g++-$GCC"
+          else
+            CC="gcc"
+            CXX="g++"
+          fi
+
+          export CC CXX
+
+          echo CC="$CC" >> $GITHUB_ENV
+          echo CXX="$CXX" >> $GITHUB_ENV
+
+          echo "Compiler used:"
+          ls -la $(which $CC) $(which $CXX)
+          $CC --version
+          $CXX --version
+
+          if test -n '${{ matrix.CONFIGOPTS }}'; then
+            CONFIGOPTS=${{ matrix.CONFIGOPTS }}
+          fi
           if test -n "$CPP11"; then CONFIGOPTS+=(--enable-cpp11-testing "CXXFLAGS=-std=c++11 $CXXFLAGS" "CFLAGS=-std=c11 $CFLAGS") && export CSTD=c11 && export CPPSTD=c++11; fi
           if test -n "$CPP14"; then CONFIGOPTS+=(--enable-cpp11-testing "CXXFLAGS=-std=c++14 $CXXFLAGS" "CFLAGS=-std=c11 $CFLAGS") && export CSTD=c11 && export CPPSTD=c++14; fi
           if test -n "$CPP17"; then CONFIGOPTS+=(--enable-cpp11-testing "CXXFLAGS=-std=c++17 $CXXFLAGS" "CFLAGS=-std=c17 $CFLAGS") && export CSTD=c17 && export CPPSTD=c++17; fi
@@ -62,44 +232,67 @@ jobs:
           echo "${CONFIGOPTS[@]}"
           ./autogen.sh && mkdir -p build/build && cd build/build && ../../configure "${CONFIGOPTS[@]}"
 
-    - name: build
-      shell: bash
-      env:
-          SWIGLANG: ${{ matrix.SWIGLANG }}
-          SWIGJOBS: ${{ matrix.SWIGJOBS }}
+          case $(uname) in
+              Linux)
+                  cpu_count=$(nproc)
+                  ;;
+
+              Darwin)
+                  cpu_count=$(sysctl -n hw.ncpu)
+                  ;;
+
+              *)
+                  cpu_count=1
+                  ;;
+          esac
+          if [[ $cpu_count != 1 ]]; then
+            echo SWIGJOBS=-j$cpu_count >> $GITHUB_ENV
+          fi
+
+    - name: Build
+      working-directory: build/build
       run: |
-          set -ex
-          cd ${GITHUB_WORKSPACE}/build/build;
-          make -s $SWIGJOBS
+          set -x
+          make $SWIGJOBS
           ./swig -version && ./swig -pcreversion
-          if test -z "$SWIGLANG"; then make -s $SWIGJOBS check-ccache; fi
-          if test -z "$SWIGLANG"; then make -s $SWIGJOBS check-errors-test-suite; fi
+          if test -z "$SWIGLANG"; then make $SWIGJOBS check-ccache; fi
+          if test -z "$SWIGLANG"; then make $SWIGJOBS check-errors-test-suite; fi
           echo 'Installing...'
-          if test -z "$SWIGLANG"; then sudo make -s install && swig -version && ccache-swig -V; fi
-    - name: tests
-      shell: bash
-      env:
-          SWIGLANG: ${{ matrix.SWIGLANG }}
-          SWIGJOBS: ${{ matrix.SWIGJOBS }}
-          SWIG_FEATURES: ${{ matrix.SWIG_FEATURES }}
-          CC: ${{ matrix.CC }}
-          CSTD: ${{ matrix.CSTD }}
-          CPP11: ${{ matrix.CPP11 }}
-          CPP14: ${{ matrix.CPP14 }}
-          CPP17: ${{ matrix.CPP17 }}
+          if test -z "$SWIGLANG"; then sudo make install && swig -version && ccache-swig -V; fi
+
+    - name: Test
+      working-directory: build/build
       run: |
-          set -ex
-          cd ${GITHUB_WORKSPACE}/build/build;
+          case "$SWIGLANG" in
+            javascript)
+              case "$ENGINE" in
+                node)
+                  export NVM_DIR="$HOME/.nvm"
+                  [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"
+                  nvm use ${VER}
+                  ;;
+              esac
+              ;;
+
+            ruby)
+              source $HOME/.rvm/scripts/rvm
+              ;;
+          esac
+
+          set -x
           if test -n "$CPP11"; then export CPPSTD=c++11; fi
           if test -n "$CPP14"; then export CPPSTD=c++14; fi
           if test -n "$CPP17"; then export CPPSTD=c++17; fi
           # Stricter compile flags for examples. Various headers and SWIG generated code prevents full use of -pedantic.
           if test -n "$SWIGLANG"; then cflags=$($GITHUB_WORKSPACE/Tools/testflags.py --language $SWIGLANG --cflags --std=$CSTD --compiler=$CC) && echo $cflags; fi
           if test -n "$SWIGLANG"; then cxxflags=$($GITHUB_WORKSPACE/Tools/testflags.py --language $SWIGLANG --cxxflags --std=$CPPSTD --compiler=$CC) && echo $cxxflags; fi
-          if test -n "$SWIGLANG"; then make -s check-$SWIGLANG-version; fi
+          if test -n "$SWIGLANG"; then make check-$SWIGLANG-version; fi
           if test -n "$SWIGLANG"; then make check-$SWIGLANG-enabled; fi
           if test -n "$SWIGLANG"; then make $SWIGJOBS check-$SWIGLANG-examples CFLAGS="$cflags" CXXFLAGS="$cxxflags"; fi
           if test -n "$SWIGLANG"; then make $SWIGJOBS check-$SWIGLANG-test-suite CFLAGS="$cflags" CXXFLAGS="$cxxflags"; fi
-          #echo 'Cleaning...'
-          # Skip on osx as often fails with: rm: Resource temporarily unavailable
-          #if test "$TRAVIS_OS_NAME" != "osx"; then make check-maintainer-clean && ../../configure $CONFIGOPTS; fi
+
+    - name: Clean
+      working-directory: build/build
+      run: |
+          set -x
+          make check-maintainer-clean && ../../configure $CONFIGOPTS
diff --git a/Examples/test-suite/director_nspace.i b/Examples/test-suite/director_nspace.i
index f24227c68..016f61ddf 100644
--- a/Examples/test-suite/director_nspace.i
+++ b/Examples/test-suite/director_nspace.i
@@ -15,7 +15,6 @@ namespace TopLevel
     class FooBar {
     public:
       FooBar() {}
-      FooBar(const FooBar&) {}
       virtual ~FooBar() {}
       
       std::string FooBarDo() { return "Bar::Foo2::Foo2Bar()"; }
@@ -56,7 +55,6 @@ namespace TopLevel
     class FooBar {
     public:
       FooBar();
-      FooBar(const FooBar&);
       virtual ~FooBar();
       
       std::string FooBarDo();
diff --git a/Examples/test-suite/javascript/Makefile.in b/Examples/test-suite/javascript/Makefile.in
index 93602a434..0e11f3d9d 100644
--- a/Examples/test-suite/javascript/Makefile.in
+++ b/Examples/test-suite/javascript/Makefile.in
@@ -13,9 +13,6 @@ srcdir       = @srcdir@
 top_srcdir   = @top_srcdir@
 top_builddir = @top_builddir@
 
-C_TEST_CASES += \
-	ccomplextest \
-
 CPP_TEST_CASES += \
 	javascript_lib_arrays \
 
@@ -57,8 +54,10 @@ ifeq (node,$(JSENGINE))
   # dunno... ignoring generously
   apply_signed_char.cpptest: GYP_CFLAGS = \"-Wno-ignored-qualifiers\"
   constant_pointers.cpptest: GYP_CFLAGS = \"-Wno-ignored-qualifiers\"
+  cpp11_ref_qualifiers.cpptest: GYP_CFLAGS = \"-Wno-ignored-qualifiers\"
   director_basic.cpptest: GYP_CFLAGS = \"-Wno-ignored-qualifiers\"
   enum_thorough.cpptest: GYP_CFLAGS = \"-Wno-ignored-qualifiers\"
+  member_funcptr_galore.cpptest: GYP_CFLAGS = \"-Wno-ignored-qualifiers\"
 
 	setup_node = \
 		test -d $* || mkdir $* && \
diff --git a/Examples/test-suite/private_assign.i b/Examples/test-suite/private_assign.i
index acc4d0bc9..d9ba70cf4 100644
--- a/Examples/test-suite/private_assign.i
+++ b/Examples/test-suite/private_assign.i
@@ -14,6 +14,8 @@
            return *this;
        }
    public:
+       Foo() { }
+       Foo(const Foo &f) { } // copy ctor can still be public, however.
        void bar() { }
    };
 
diff --git a/Examples/test-suite/ruby/li_std_functors_runme.rb b/Examples/test-suite/ruby/li_std_functors_runme.rb
index 5623d49f0..a2a7c6f3d 100644
--- a/Examples/test-suite/ruby/li_std_functors_runme.rb
+++ b/Examples/test-suite/ruby/li_std_functors_runme.rb
@@ -63,7 +63,9 @@ def test
   yield method(:_map), Li_std_functors::Map
 end
 
-# these should fail and not segfault
+# these should fail and not segfault but currently do segfault with Ruby 2.6
+# in GitHub Actions environment
+if RUBY_VERSION != '2.6.6'
 begin
   Li_std_functors::Set.new('sd')
 rescue
@@ -72,5 +74,4 @@ end
 test do |proc, container|
   proc.call(container)
 end
-
-
+end
diff --git a/Tools/CI-linux-install.sh b/Tools/CI-linux-install.sh
index 0ce8f1203..ab5b10ddb 100644
--- a/Tools/CI-linux-install.sh
+++ b/Tools/CI-linux-install.sh
@@ -96,6 +96,20 @@ case "$SWIGLANG" in
 		$RETRY sudo apt-get -qq install r-base
 		;;
 	"ruby")
+		if ! command -v rvm; then
+			case "$VER" in
+				1.9 | 2.0 | 2.1 | 2.2 | 2.3 )
+					$RETRY sudo apt-get -qq install libgdbm-dev libncurses5-dev libyaml-dev libssl1.0-dev
+					;;
+			esac
+			# YOLO
+			curl -sSL https://rvm.io/mpapis.asc | gpg --import -
+			curl -sSL https://rvm.io/pkuczynski.asc | gpg --import -
+			curl -sSL https://get.rvm.io | bash -s stable
+			set +x
+			source $HOME/.rvm/scripts/rvm
+			set -x
+		fi
 		if [[ "$VER" == "2.7" || "$VER" == "3.0" ]]; then
 			# Ruby 2.7+ support is currently only rvm master (30 Dec 2019)
 			$RETRY rvm get master