--- a/.github/workflows/make.yaml	Thu Jan 18 13:56:36 2024 -0500
+++ b/.github/workflows/make.yaml	Thu Jan 18 20:15:21 2024 +0100
@@ -14,7 +14,7 @@
       matrix:
         # For available GitHub-hosted runners, see:
         # https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
-        os: [ubuntu-22.04, ubuntu-20.04]
+        os: [ubuntu-22.04]
         compiler: [gcc, clang]
         include:
           - compiler: gcc
@@ -30,15 +30,9 @@
           # "ccache" on Ubuntu 20.04 doesn't compress the cache.
           # Clang seems to generally require less cache size (smaller object files?).
           - ccache-max: 1.2G
-          - os: ubuntu-20.04
-            compiler: gcc
-            ccache-max: 6G
           - os: ubuntu-22.04
             compiler: gcc
             ccache-max: 1.2G
-          - os: ubuntu-20.04
-            compiler: clang
-            ccache-max: 3G
           - os: ubuntu-22.04
             compiler: clang
             ccache-max: 400M
@@ -468,7 +462,7 @@
 
       matrix:
         # For available GitHub-hosted runners, see: https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
-        os: [macos-13, macos-12]
+        os: [macos-13]
         # Most (or all) homebrew packages are compiled with clang and link
         # against libc++.  So we also use clang to avoid issues with symbols
         # that don't match.
@@ -489,13 +483,6 @@
             qt-cppflags: "-I/usr/local/opt/qt@6/include/QtCore -I/usr/local/opt/qt@6/include/QtGui -I/usr/local/opt/qt@6/include/QtHelp -I/usr/local/opt/qt@6/include/QtNetwork -I/usr/local/opt/qt@6/include/QtOpenGL -I/usr/local/opt/qt@6/include/QtOpenGLWidgets -I/usr/local/opt/qt@6/include/QtPrintSupport -I/usr/local/opt/qt@6/include/QtSql -I/usr/local/opt/qt@6/include/QtWidgets -I/usr/local/opt/qt@6/include/QtXml -I/usr/local/opt/qt@6/include/QtCore5Compat"
             qt-ldflags: "-F/usr/local/opt/qt@6/Frameworks"
             qt-libs: "-framework QtCore -framework QtGui -framework QtHelp -framework QtNetwork -framework QtOpenGL -framework QtOpenGLWidgets -framework QtPrintSupport -framework QtSql -framework QtWidgets -framework QtXml -framework QtCore5Compat"
-          - os: macos-13
-            qt: "5"
-            cc: "clang"
-            cxx: "clang++"
-            # SUNDIALS >= 6.5.0 doesn't compile with the default flags determined
-            # by the configure script. Set CXX manually to enable building with it.
-            cxx-compiler-flags: "-std=gnu++14"
 
     env:
       CC: ${{ matrix.cc }}
@@ -718,7 +705,7 @@
       matrix:
         # For available GitHub-hosted runners, see: https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
         os: [windows-latest]
-        msystem: [MINGW64, CLANG64]
+        msystem: [MINGW64]
         include:
           - msystem: MINGW64
             mingw-prefix: mingw64
@@ -729,22 +716,6 @@
             extra-config-flags: ""
             ccache-max: 0.9G
             allow-error: false
-          - msystem: CLANG64
-            mingw-prefix: clang64
-            target-prefix: mingw-w64-clang-x86_64
-            cc: clang
-            # It looks like we and graphicsmagick++ aren't ready for C++17 yet.
-            cxx: "clang++ -std=gnu++14"
-            f77: flang
-            # Clang seems to require a different set of dllexport attributes than GCC.
-            # autoconf and libtool still need help to correctly invoke flang.
-            extra-config-flags:
-              --disable-lib-visibility-flags
-              ac_cv_f77_compiler_gnu=yes
-              lt_cv_prog_gnu_ld=yes
-            ccache-max: 400M
-            # This configuration is not fully supported yet
-            allow-error: true
 
     env:
       CHERE_INVOKING: 1
@@ -980,287 +951,3 @@
           export PATH="/c/octave/pkg/${{ matrix.mingw-prefix }}/bin:$PATH"
           mkoctfile --link-stand-alone embedded.cc -o embedded
           ./embedded.exe
-
-      - name: compress build artifact
-        if: matrix.msystem == 'MINGW64'
-        continue-on-error: true
-        run: |
-          cd /c/octave/pkg
-          tar -cvzf octave.tar.gz *
-
-      - name: upload build artifact
-        if: matrix.msystem == 'MINGW64'
-        continue-on-error: true
-        uses: actions/upload-artifact@v3
-        with:
-          name: ${{ matrix.target-prefix }}-octave-${{ steps.ccache-prepare.outputs.timestamp }}
-          path: C:\octave\pkg\octave.tar.gz
-          retention-days: 7
-
-
-  cygwin:
-    runs-on: ${{ matrix.os }}
-
-    defaults:
-      run:
-        # Use Cygwin bash as default shell
-        shell: C:\cygwin\bin\bash.exe --login -eo pipefail -o igncr '{0}'
-
-    strategy:
-      # Allow other runners in the matrix to continue if some fail
-      fail-fast: false
-
-      matrix:
-        # For available GitHub-hosted runners, see: https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
-        os: [windows-latest]
-
-    env:
-      CHERE_INVOKING: "1"
-      CC:  gcc
-      CXX:  g++
-      F77:  gfortran
-      # ccache 3.1 doesn't read configuration files
-      CCACHE_COMPRESS: "1"
-
-    steps:
-      - name: get CPU name
-        shell: pwsh
-        run : |
-          Get-CIMInstance -Class Win32_Processor | Select-Object -Property Name
-
-      - name: checkout repository
-        # This must be done before installing Cygwin because their git is
-        # incompatible with this action.
-        uses: actions/checkout@v3
-
-      - name: install Cygwin build environment
-        uses: cygwin/cygwin-install-action@v2
-        with:
-          # The packages are listed in (alphabetically sorted) blocks:
-          # The first block is for mandatory dependencies.
-          # The second block is for optional dependencies needed when building from a release tarball.
-          # The third block is for additional dependencies needed when building from a repository checkout.
-          # The fourth block is for additional run-time dependencies (to run test suite) that aren't needed to build.
-
-          # FIXME: libklu-devel should depend on libbtf-devel.  Install it manually even if Octave doesn't explicitly use it.
-          packages: >-
-            autoconf
-            automake
-            make
-            gcc-g++
-            gcc-fortran
-            bison
-            dash
-            flex
-            gperf
-            libtool
-            liblapack-devel
-            libpcre2-devel
-            libreadline-devel
-
-            ghostscript
-            gnuplot-base
-            libamd-devel
-            libarpack-devel
-            libbtf-devel
-            libbz2-devel
-            libcamd-devel
-            libccolamd-devel
-            libcholmod-devel
-            libcolamd-devel
-            libcurl-devel
-            libcxsparse-devel
-            libfftw3-devel
-            libfltk-devel
-            libfontconfig-devel
-            libfreetype-devel
-            libGL-devel
-            libgl2ps-devel
-            libglpk-devel
-            libGLU-devel
-            libgomp1
-            libGraphicsMagick-devel
-            libhdf5-devel
-            libiconv-devel
-            libklu-devel
-            libportaudio-devel
-            libqhull-devel
-            libqrupdate-devel
-            libqscintilla2_qt5-devel
-            libQt5Core-devel
-            libQt5Gui-devel
-            libQt5Help-devel
-            libsndfile-devel
-            libsuitesparseconfig-devel
-            libsundials-devel
-            libspqr-devel
-            libumfpack-devel
-            qt5-doc-tools
-            rapidjson-devel
-
-            ccache
-            git
-            icoutils
-            rsvg
-            texinfo
-
-            unzip
-            zip
-
-      - name: prepare ccache
-        # create key with human readable timestamp
-        # used in action/cache/restore and action/cache/save steps
-        id: ccache-prepare
-        run: |
-          echo "ccachedir=$(cygpath -m ~/.ccache)" >> $GITHUB_OUTPUT
-          echo "key=ccache:${{ matrix.os }}:cygwin:${{ github.ref }}:$(date +"%Y-%m-%d_%H-%M-%S"):${{ github.sha }}" >> $GITHUB_OUTPUT
-
-      - name: restore ccache
-        # Setup a github cache used to maintain the ccache from one run to the next
-        uses: actions/cache/restore@v3.2.2
-        with:
-          path: ${{ steps.ccache-prepare.outputs.ccachedir }}
-          key: ${{ steps.ccache-prepare.outputs.key }}
-          restore-keys: |
-            ccache:${{ matrix.os }}:cygwin:${{ github.ref }}
-            ccache:${{ matrix.os }}:cygwin:refs/heads/default
-
-      - name: configure ccache
-        run: |
-          # work around issue with ccache calling itself recursively
-          [ -f /usr/bin/ccache.exe ] && mv /usr/bin/ccache.exe /usr/bin/ccache
-          which ccache
-          ccache -V
-          # ccache 3.1 doesn't read configuration files
-          # test -d ${{ steps.ccache-prepare.outputs.ccachedir }} || mkdir -p ${{ steps.ccache-prepare.outputs.ccachedir }}
-          # echo "max_size = 0.9G" > ${{ steps.ccache-prepare.outputs.ccachedir }}/ccache.conf
-          # echo "compression = true" >> ${{ steps.ccache-prepare.outputs.ccachedir }}/ccache.conf
-          # limit maximum cache size to avoid exceeding the total disk or cache quota
-          ccache -M 0.9G
-          ccache -s
-          # create ccache symlinks for all compilers
-          test -d /usr/lib/ccache/bin || mkdir -p /usr/lib/ccache/bin
-          ln -s /usr/bin/ccache /usr/lib/ccache/bin/${CC}.exe
-          ln -s /usr/bin/ccache /usr/lib/ccache/bin/${CXX}.exe
-          ln -s /usr/bin/ccache /usr/lib/ccache/bin/${F77}.exe
-          # prepend path to ccache symlinks to PATH
-          echo 'export PATH="/usr/lib/ccache/bin:$PATH"' >> ~/.bash_profile
-
-      - name: bootstrap
-        run: GNULIB_URL=https://github.com/coreutils/gnulib.git ./bootstrap
-
-      - name: configure
-        # FIXME: Fix building with Java support.  Override JAVA_HOME for now.
-        # FIXME: How do we get a working TeX environment in Cygwin?  Disable building the documentation for now.
-        run: |
-          echo $PATH
-          which $CC
-          echo $CC --version
-          $CC --version
-          which $CXX
-          echo $CXX --version
-          $CXX --version
-          which $F77
-          echo $F77 --version
-          $F77 --version
-          mkdir .build
-          cd .build && ../configure \
-            --libexecdir=/usr/lib \
-            --enable-shared \
-            --disable-java \
-            --disable-docs \
-            JAVA_HOME="" \
-            EGREP="grep -E" \
-            FLIBS="-lgfortran -lquadmath"
-
-      - name: build
-        # Spawning processes seems to have a big overhead on this platform.  Use a somewhat larger number of parallel processes to compensate for that.
-        run: |
-          EGREP="grep -E" make -C ./.build all -j8 V=1
-
-      - name: ccache status
-        continue-on-error: true
-        run: ccache -s
-
-      - name: save ccache
-        # Save the cache after we are done (successfully) building
-        uses: actions/cache/save@v3.2.2
-        with:
-          path: ${{ steps.ccache-prepare.outputs.ccachedir }}
-          key: ${{ steps.ccache-prepare.outputs.key }}
-
-      - name: check
-        # Continuing on error in this step means that jobs will be "green" even
-        # if the test suite crashes.  But if we don't continue, we'll loose the
-        # ccache.
-        # It would be nice if we could mark the job as "yellow" (and continue)
-        # in that case.  The second best thing is to display a warning in the
-        # job summary (see below).
-        continue-on-error: true
-        timeout-minutes: 60
-
-        # mkoctfile seems to have trouble when gcc is called via ccache.  So,
-        # remove the directory with the ccache wrappers from PATH.
-
-        run: |
-          export PATH=$(echo "$PATH" | sed -e "s|/usr/lib/ccache/bin:||g")
-          EGREP="grep -E" make -C ./.build check-tree-evaluator | tee ./test-suite.log
-
-      - name: display test suite log
-        continue-on-error: true
-        # Displaying the log shouldn't take long.  Cancel the step if it does.
-        timeout-minutes: 5
-        run: cat ./.build/test/fntests.log
-
-      - name: check with bytecode interpreter
-        timeout-minutes: 60
-        run: |
-          mv ./.build/test/fntests.log ./.build/test/fntests-no-bci.log
-          export PATH=$(echo "$PATH" | sed -e "s|/usr/lib/ccache/bin:||g")
-          EGREP="grep -E" make -C ./.build check-bytecode-evaluator | tee ./test-suite-bci.log
-
-      - name: display test suite log with bytecode interpreter
-        continue-on-error: true
-        # Displaying the log shouldn't take long. Cancel the step if it does.
-        timeout-minutes: 5
-        run: cat ./.build/test/fntests.log
-
-      - name: difference between logs with and without bytecode interpreter
-        continue-on-error: true
-        run: |
-          echo "::group::diff test-suite.log"
-          echo "diff -urN ./test-suite.log ./test-suite-bci.log"
-          diff -urN ./test-suite.log ./test-suite-bci.log || true
-          echo "::endgroup::"
-          echo "::group::diff fntests.log"
-          echo "diff -urN ./.build/test/fntests-no-bci.log ./.build/test/fntests.log"
-          diff -urN ./.build/test/fntests-no-bci.log ./.build/test/fntests.log || true
-          echo "::endgroup::"
-
-      - name: analyze test suite results
-        # Make sure the test summary lists 0 "FAIL"s and no "REGRESSION"
-        run: |
-          [ -n "$(grep -e "FAIL\s*0" ./test-suite.log)" ] || echo "::warning::At least one test failed"
-          [ -z "$(grep -e "REGRESSION" ./test-suite.log)" ] || echo "::warning::At least one regression in test suite"
-          [ -n "$(grep -e "FAIL\s*0" ./test-suite-bci.log)" ] || echo "::warning::At least one test failed with bytecode interpreter"
-          [ -z "$(grep -e "REGRESSION" ./test-suite-bci.log)" ] || echo "::warning::At least one regression in test suite with bytecode interpreter"
-          echo Finished analyzing test suite results.
-
-      - name: test history file creation
-        # see bug #62365
-        # Pipe to an interactive session to trigger appending the command to
-        # the history.  This will trigger the creation of a history file.
-        run: |
-          echo "history_file (make_absolute_filename ('./a/b/c/history')); disp ('test')" | ./.build/run-octave -i
-          [ -f ./a/b/c/history ] || echo "::warning::Creating history file failed"
-
-      - name: install
-        run: |
-          make -C ./.build install
-
-      - name: test stand-alone executable
-        run: |
-          export PATH=$(echo "$PATH" | sed -e "s|/usr/lib/ccache/bin:||g")
-          cd examples/code
-          mkoctfile --link-stand-alone embedded.cc -o embedded
-          ./embedded.exe