diff --git a/.appveyor.yml b/.appveyor.yml
deleted file mode 100644
index a943afc93..000000000
--- a/.appveyor.yml
+++ /dev/null
@@ -1,169 +0,0 @@
-version: 8.3.0-{build}
-
-image:
-- Visual Studio 2022
-
-environment:
-  STUDIO_VERSION_EDITION: Studio\2022\Community
-  MINGW_FOLDER: mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32
-  DJGPP_VER: 3.4
-  DJGPP_GCC_VER: 1220
-  DMC_VER: 857
-  WATCOM_VER: 2024-04-01
-  CMAKE_CONFIG: Debug
-  TEST_TARGET: check
-  matrix:
-  - TARGET: cmake
-    CMAKE_OPTIONS: -DCMAKE_BUILD_TYPE=Debug -DBUILD_SHARED_LIBS=OFF -Dbuild_tests=ON -Denable_cplusplus=ON -Denable_gc_assertions=ON -Werror=deprecated -Dwithout_libatomic_ops=ON
-  - TARGET: cmake
-    CMAKE_OPTIONS: -Dbuild_tests=ON -Denable_cplusplus=ON -Denable_throw_bad_alloc_library=OFF -Denable_gc_assertions=ON -Denable_gc_debug=ON -Denable_threads=OFF
-  - TARGET: cmake
-    CFLAGS_EXTRA: -DNO_MSGBOX_ON_ERROR -DNO_MPROTECT_VDB -DGC_READ_ENV_FILE
-    CMAKE_CONFIG: Release
-    CMAKE_OPTIONS: -DCMAKE_BUILD_TYPE=Release -Dbuild_tests=ON -Denable_cplusplus=ON -Denable_large_config=ON -Ddisable_gc_debug=ON -Denable_dynamic_pointer_mask=ON -Denable_rwlock=ON
-  - TARGET: cmake
-    CMAKE_CONFIG: Release
-    CMAKE_OPTIONS: -DCMAKE_BUILD_TYPE=MinSizeRel -Denable_parallel_mark=OFF
-  - TARGET: cmake
-    CMAKE_OPTIONS: -Dbuild_tests=ON -Denable_gc_assertions=ON -Denable_thread_local_alloc=OFF -Ddisable_single_obj_compilation=ON
-  - TARGET: cmake
-    CFLAGS_EXTRA: -DGC_DISABLE_INCREMENTAL
-    CMAKE_OPTIONS: -Dbuild_tests=ON -Denable_gc_assertions=ON -Denable_gcj_support=OFF -Denable_parallel_mark=OFF -Denable_thread_local_alloc=OFF -Denable_valgrind_tracking=ON
-  - TARGET: cmake
-    CMAKE_OPTIONS: -A Win32 -Dbuild_tests=ON -Denable_cplusplus=ON -Denable_gc_assertions=ON -Denable_large_config=ON
-  - TARGET: cmake
-    CMAKE_OPTIONS: -A ARM -Denable_cplusplus=ON -Denable_gc_assertions=ON
-  - TARGET: cmake
-    CMAKE_OPTIONS: -A ARM64 -DCMAKE_BUILD_TYPE=Release -Denable_cplusplus=ON
-    CMAKE_CONFIG: Release
-  - TARGET: nmake
-    ARCH: x86
-    NMAKE_OPTIONS: enable_static=1
-  - TARGET: nmake
-    ARCH: x64
-    CFLAGS_EXTRA: /J
-  - TARGET: nmake
-    ARCH: x86
-    NMAKE_OPTIONS: nodebug=1
-  - TARGET: nmake
-    ARCH: x64
-    NMAKE_OPTIONS: disable_threads=1
-  - TARGET: djgpp-no-make
-    CFLAGS_EXTRA: -O3 -DALL_INTERIOR_POINTERS -DNO_EXECUTE_PERMISSION -DENABLE_DISCLAIM -DGC_ATOMIC_UNCOLLECTABLE -DGC_GCJ_SUPPORT
-  - TARGET: dmc
-    CFLAGS_EXTRA: -s -DNO_MSGBOX_ON_ERROR
-  - TARGET: mingw-shared-no-make
-    CFLAGS_EXTRA: -D GC_THREADS -D GC_ASSERTIONS -D ENABLE_DISCLAIM -D GC_GCJ_SUPPORT -D GC_PREFER_MPROTECT_VDB -D GC_CALL=__stdcall -D GC_CALLBACK=__fastcall -D CONSOLE_LOG -D NO_MSGBOX_ON_ERROR -D USE_RWLOCK -D _WIN32_WINNT=0x0600
-  - TARGET: msys64
-  - TARGET: msys64
-    CFLAGS_EXTRA: -D GC_THREADS -D THREAD_LOCAL_ALLOC -D PARALLEL_MARK -D GC_ASSERTIONS -D EMPTY_GETENV_RESULTS -D GC_GCJ_SUPPORT -D USE_MUNMAP -D LARGE_CONFIG -D NO_MSGBOX_ON_ERROR
-    TEST_TARGET: check cord/de
-  - TARGET: msys64
-    CFLAGS_EXTRA: -O3 -march=native -D GC_THREADS -D GC_GCJ_SUPPORT -D GC_TIME_LIMIT=10 -D WINXP_USE_PERF_COUNTER -D NO_MSGBOX_ON_ERROR -D NO_TEST_ENDTHREADEX
-  - TARGET: msys64
-    CFLAGS_EXTRA: -D NO_MSGBOX_ON_ERROR
-  - TARGET: msys64
-    CFLAGS_EXTRA: -D GC_THREADS -D THREAD_LOCAL_ALLOC -D PARALLEL_MARK -D GC_ASSERTIONS -D GC_GCJ_SUPPORT -D NO_RETRY_GET_THREAD_CONTEXT
-  - TARGET: wcc
-    WCC_SYSTEM: DOS4GW
-    CFLAGS_EXTRA: -DSMALL_CONFIG
-    ENABLE_STATIC_OPT: "ENABLE_STATIC=1"
-    TEST_TARGET: check-deps
-  - TARGET: wcc
-    WCC_SYSTEM: OS2
-    CFLAGS_EXTRA: -DGC_ASSERTIONS
-    ENABLE_STATIC_OPT: "ENABLE_STATIC=1"
-    TEST_TARGET: check-deps
-    WCC_INC_SUBDIR: os2
-  - TARGET: wcc
-    WCC_SYSTEM: MSWIN32
-    CFLAGS_EXTRA: -DCONSOLE_LOG -DUSE_MMAP -DUSE_MUNMAP
-    WCC_INC_SUBDIR: nt
-  - TARGET: cygwin64
-    CONF_OPTIONS: --enable-cplusplus --enable-gc-debug
-  - TARGET: cygwin64
-    CONF_OPTIONS: --disable-threads
-    CFLAGS_EXTRA: -std=c11 -D USE_WINALLOC
-  - TARGET: cygwin64
-    CONF_OPTIONS: --enable-cplusplus
-    CFLAGS_EXTRA: -D GCTEST_PRINT_VERBOSE -D DONT_PROTECT_PTRFREE
-  - TARGET: cygwin64
-    CONF_OPTIONS: --enable-cplusplus --disable-munmap --enable-gc-assertions --enable-redirect-malloc
-  - TARGET: cygwin64
-    CFLAGS_EXTRA: -D GC_ALWAYS_MULTITHREADED -D LINT2 -D TEST_MANUAL_VDB
-    CONF_OPTIONS: --enable-cplusplus --enable-gc-assertions --enable-rwlock --disable-shared
-
-clone_depth: 50
-
-install:
-- cmd: git clone --depth=50 https://github.com/ivmai/libatomic_ops.git
-
-build_script:
-- cmd: if [%TARGET%]==[cmake] (
-    mkdir out && cd out
-    && cmake %CMAKE_OPTIONS% -Denable_werror=ON -DCFLAGS_EXTRA="%CFLAGS_EXTRA%" ..
-    && cmake --build . --config %CMAKE_CONFIG% --verbose --parallel )
-- cmd: if [%TARGET%]==[nmake] (
-    "C:\Program Files\Microsoft Visual %STUDIO_VERSION_EDITION%\VC\Auxiliary\Build\vcvarsall.bat" %ARCH%
-    && nmake /f NT_MAKEFILE %NMAKE_OPTIONS% CFLAGS_EXTRA="/WX %CFLAGS_EXTRA%" )
-- cmd: if [%TARGET%]==[cygwin64] (
-    C:\cygwin64\bin\bash -e -l -c
-      "cd /cygdrive/c/projects/bdwgc && ./autogen.sh
-       && ./configure %CONF_OPTIONS% --enable-werror && cat include/config.h
-       && make -j CFLAGS_EXTRA='%CFLAGS_EXTRA%'" )
-- cmd: if [%TARGET%]==[djgpp-no-make] (
-    appveyor DownloadFile "https://github.com/andrewwutw/build-djgpp/releases/download/v%DJGPP_VER%/djgpp-mingw-gcc%DJGPP_GCC_VER%-standalone.zip"
-    && 7z x -o.. djgpp-mingw-gcc%DJGPP_GCC_VER%-standalone.zip > nul
-    && ..\djgpp\setenv.bat
-    && gcc -I include -Werror -Wall -Wextra -Wpedantic %CFLAGS_EXTRA% -c extra/gc.c )
-- cmd: if [%TARGET%]==[dmc] (
-    appveyor DownloadFile "http://ftp.digitalmars.com/Digital_Mars_C++/Patch/dm%DMC_VER%c.zip"
-    && 7z x -o.. dm%DMC_VER%c.zip > nul && set "path=%cd%\..\dm\bin;%path%"
-    && make -f digimars.mak CFLAGS_EXTRA="-wx %CFLAGS_EXTRA%" )
-- cmd: if [%TARGET%]==[mingw-shared-no-make] (
-    set "path=C:\%MINGW_FOLDER%\bin;%path%"
-    && gcc -I include -D GC_BUILTIN_ATOMIC -D GC_DLL -Werror -Wall -Wextra -Wpedantic %CFLAGS_EXTRA% -shared -o gc.dll extra/gc.c )
-- cmd: if [%TARGET%]==[msys64] (
-    C:\msys64\usr\bin\bash -e -l -c
-      "cd /c/projects/bdwgc
-       && make -j -f Makefile.direct CC=gcc CFLAGS_EXTRA='-Werror -Wall -Wextra -Wpedantic %CFLAGS_EXTRA%'" )
-- cmd: if [%TARGET%]==[wcc] (
-    appveyor DownloadFile "https://github.com/open-watcom/open-watcom-v2/releases/download/%WATCOM_VER%-Build/ow-snapshot.tar.xz"
-    && 7z x ow-snapshot.tar.xz > nul && 7z x -o..\watcom ow-snapshot.tar > nul
-    && set "watcom=%cd%\..\watcom" && set "path=%cd%\..\watcom\binnt64"
-    && set "include=%cd%\..\watcom\h\%WCC_INC_SUBDIR%;%cd%\..\watcom\h"
-    && wmake -f WCC_MAKEFILE SYSTEM=%WCC_SYSTEM% %ENABLE_STATIC_OPT% CFLAGS_EXTRA="-we %CFLAGS_EXTRA%" )
-
-test_script:
-- cmd: if [%TARGET%]==[cmake] (
-    ctest --build-config %CMAKE_CONFIG% --verbose --parallel 4 )
-- cmd: if [%TARGET%]==[nmake] (
-    "C:\Program Files\Microsoft Visual %STUDIO_VERSION_EDITION%\VC\Auxiliary\Build\vcvarsall.bat" %ARCH%
-    && nmake /f NT_MAKEFILE %TEST_TARGET% %NMAKE_OPTIONS% CFLAGS_EXTRA="/WX %CFLAGS_EXTRA%"
-    && nmake /f NT_MAKEFILE clean )
-- cmd: if [%TARGET%]==[cygwin64] (
-    C:\cygwin64\bin\bash -e -l -c
-      "cd /cygdrive/c/projects/bdwgc
-       && make -j check-without-test-driver CFLAGS_EXTRA='%CFLAGS_EXTRA%'" )
-- cmd: if [%TARGET%]==[djgpp-no-make] (
-    ..\djgpp\setenv.bat
-    && gcc -I include -Werror -Wall -Wextra -Wpedantic %CFLAGS_EXTRA% -o cordtest.exe cord/tests/cordtest.c cord/*.c gc.o
-    && gcc -I include -Werror -Wall -Wextra -Wpedantic %CFLAGS_EXTRA% -v -o gctest.exe tests/gctest.c gc.o )
-- cmd: if [%TARGET%]==[dmc] (
-    set "path=%cd%\..\dm\bin;%path%"
-    && make -f digimars.mak %TEST_TARGET% CFLAGS_EXTRA="-wx %CFLAGS_EXTRA%"
-    && type gctest.gc.log cpptest.gc.log
-    && make -f digimars.mak clean )
-- cmd: if [%TARGET%]==[mingw-shared-no-make] (
-    set "path=C:\%MINGW_FOLDER%\bin;%path%"
-    && gcc -I include -D GC_BUILTIN_ATOMIC -D GC_DLL -Werror -Wall -Wextra -Wpedantic %CFLAGS_EXTRA% -o gctest.exe tests/gctest.c gc.dll
-    && gctest.exe )
-- cmd: if [%TARGET%]==[msys64] (
-    C:\msys64\usr\bin\bash -e -l -c
-      "cd /c/projects/bdwgc
-       && make -j -f Makefile.direct %TEST_TARGET% CC=gcc CURSES=-lgdi32 CFLAGS_EXTRA='-Werror -Wall -Wextra -Wpedantic %CFLAGS_EXTRA%'" )
-- cmd: if [%TARGET%]==[wcc] (
-    set "watcom=%cd%\..\watcom" && set "beginlibpath=%cd%\..\watcom\binp\dll"
-    && set "path=%cd%\..\watcom\binnt64;%cd%\..\watcom\binnt"
-    && wmake -f WCC_MAKEFILE %TEST_TARGET% SYSTEM=%WCC_SYSTEM% %ENABLE_STATIC_OPT% CFLAGS_EXTRA="-we %CFLAGS_EXTRA%"
-    && wmake -f WCC_MAKEFILE clean )
diff --git a/.github/workflows/CodeQL.yml b/.github/workflows/CodeQL.yml
deleted file mode 100644
index c53d1c638..000000000
--- a/.github/workflows/CodeQL.yml
+++ /dev/null
@@ -1,35 +0,0 @@
-# CodeQL workflow for GitHub code scanning.
-name: CodeQL
-
-on: [ push, pull_request ]
-
-jobs:
-  analyze:
-    name: Analyze
-    runs-on: ubuntu-latest
-    permissions:
-      actions: read
-      contents: read
-      security-events: write
-
-    strategy:
-      fail-fast: false
-      matrix:
-        language: [ 'c-cpp' ]
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Initialize CodeQL
-        uses: github/codeql-action/init@v3
-        with:
-          languages: ${{ matrix.language }}
-
-      - name: Autobuild
-        uses: github/codeql-action/autobuild@v3
-
-      - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@v3
-        with:
-          category: "/language:${{ matrix.language }}"
diff --git a/.github/workflows/cmake-build.yml b/.github/workflows/cmake-build.yml
deleted file mode 100644
index d4568e6ce..000000000
--- a/.github/workflows/cmake-build.yml
+++ /dev/null
@@ -1,114 +0,0 @@
-# This workflow is for CMake-based build/test running on multiple platforms.
-name: cmake build
-
-on: [push, pull_request]
-
-jobs:
-  build:
-    name: ${{ matrix.os }} ${{ matrix.c_compiler }} thr:${{ matrix.enable_threads }} rwlock:${{ matrix.enable_rwlock }} redir:${{ matrix.redirect_malloc }} dll:${{ matrix.shared_libs }} cpp:${{ matrix.enable_cplusplus }}
-    runs-on: ${{ matrix.os }}
-    timeout-minutes: 6
-
-    strategy:
-      # Deliver the feedback for all matrix combinations.
-      fail-fast: false
-
-      matrix:
-        os: [ macos-latest, ubuntu-latest, windows-latest ]
-        c_compiler: [ cl, clang, gcc ]
-        cxx_compiler: [ cl, clang++, g++ ]
-        enable_cplusplus: [ off, on ]
-        build_type: [ Release ]
-        disable_gc_debug: [ off ]
-        gc_assertions: [ on ]
-        large_config: [ on ]
-        enable_threads: [ off, on ]
-        enable_rwlock: [ off, on ]
-        redirect_malloc: [ off, on ]
-        shared_libs: [ off, on ]
-        exclude:
-        - os: macos-latest
-          c_compiler: cl
-        - os: macos-latest
-          c_compiler: gcc
-        - os: ubuntu-latest
-          c_compiler: cl
-        - enable_threads: off
-          enable_rwlock: on
-        - c_compiler: cl
-          cxx_compiler: clang++
-        - c_compiler: cl
-          cxx_compiler: g++
-        - c_compiler: clang
-          cxx_compiler: cl
-        - c_compiler: clang
-          cxx_compiler: g++
-        - c_compiler: gcc
-          cxx_compiler: cl
-        - c_compiler: gcc
-          cxx_compiler: clang++
-        - os: macos-latest
-          enable_cplusplus: off
-        - os: ubuntu-latest
-          enable_cplusplus: off
-        - os: windows-latest
-          c_compiler: cl
-          enable_cplusplus: off
-        - os: windows-latest # TODO: replacement operator cannot be inline
-          c_compiler: clang
-          enable_cplusplus: on
-        - os: windows-latest
-          c_compiler: gcc
-          enable_cplusplus: off
-        - os: windows-latest # TODO: support dependency on libatomic_ops
-          c_compiler: cl
-          enable_threads: on
-        include:
-        - os: windows-latest
-          c_compiler: gcc
-          cmake_generator_opt: '-G "Unix Makefiles"'
-        - os: windows-latest
-          c_compiler: clang
-          cmake_generator_opt: '-G "Unix Makefiles"'
-
-    steps:
-    - uses: actions/checkout@v4
-
-    - name: Set reusable strings
-      # Turn repeated input strings into step outputs.
-      id: strings
-      shell: bash
-      run: |
-        echo "build-output-dir=${{ github.workspace }}/build" >> "$GITHUB_OUTPUT"
-
-    - name: Configure CMake
-      # Configure CMake in a 'build' subdirectory.
-      run: >
-        cmake -B ${{ steps.strings.outputs.build-output-dir }}
-        ${{ matrix.cmake_generator_opt }}
-        -DBUILD_SHARED_LIBS=${{ matrix.shared_libs }}
-        -DCMAKE_C_COMPILER=${{ matrix.c_compiler }}
-        -DCMAKE_CXX_COMPILER=${{ matrix.cxx_compiler }}
-        -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
-        -Dbuild_tests=ON
-        -Ddisable_gc_debug=${{ matrix.disable_gc_debug }}
-        -Denable_cplusplus=${{ matrix.enable_cplusplus }}
-        -Denable_gc_assertions=${{ matrix.gc_assertions }}
-        -Denable_large_config=${{ matrix.large_config }}
-        -Denable_redirect_malloc=${{ matrix.redirect_malloc }}
-        -Denable_rwlock=${{ matrix.enable_rwlock }}
-        -Denable_threads=${{ matrix.enable_threads }}
-        -Denable_werror=ON
-        -Werror=dev
-        -S ${{ github.workspace }}
-
-    - name: Build
-      # Build the code with the given configuration.
-      run: >
-        cmake --build ${{ steps.strings.outputs.build-output-dir }}
-        --config ${{ matrix.build_type }} --verbose --parallel
-
-    - name: Test
-      working-directory: ${{ steps.strings.outputs.build-output-dir }}
-      # Execute tests defined by the CMake configuration.
-      run: ctest --build-config ${{ matrix.build_type }} --verbose --parallel 8
diff --git a/.github/workflows/zig-build.yml b/.github/workflows/zig-build.yml
index 7f9eae573..9f0f325e6 100644
--- a/.github/workflows/zig-build.yml
+++ b/.github/workflows/zig-build.yml
@@ -16,18 +16,21 @@ jobs:
         zig_version: [ "0.12.0" ]
         os: [ macos-latest, ubuntu-latest, windows-latest ]
         ttriple: [ native, native-native-msvc ]
+        enable_cplusplus: [ true ]
         gc_assertions: [ true ]
         large_config: [ false ]
-        enable_threads: [ false, true ]
+        enable_threads: [ true ] # false,
         disable_handle_fork: [ false ]
         enable_rwlock: [ false, true ]
-        redirect_malloc: [ false, true ]
-        enable_gc_debug: [ false, true ]
-        enable_munmap: [ false, true ]
-        parallel_mark: [ false, true ]
+        redirect_malloc: [ false ] # , true
+        enable_gc_debug: [ false ] # , true
+        enable_munmap: [ true ] # false,
+        parallel_mark: [ true ] # false,
         thread_local_alloc: [ false, true ]
         shared_libs: [ false, true ]
         exclude:
+        - ttriple: native-native-msvc # ?? remove
+          shared_libs: true
         - os: macos-latest
           ttriple: native-native-msvc
         - os: ubuntu-latest
@@ -93,6 +96,7 @@ jobs:
         zig build -Dtarget=${{ matrix.ttriple }}
         -DBUILD_SHARED_LIBS=${{ matrix.shared_libs }}
         -Ddisable_handle_fork=${{ matrix.disable_handle_fork }}
+        -Denable_cplusplus=${{ matrix.enable_cplusplus }}
         -Denable_gc_assertions=${{ matrix.gc_assertions }}
         -Denable_gc_debug=${{ matrix.enable_gc_debug }}
         -Denable_large_config=${{ matrix.large_config }}
diff --git a/.github/workflows/zig-cross-compile.yml b/.github/workflows/zig-cross-compile.yml
index eccd64422..ee0b7594f 100644
--- a/.github/workflows/zig-cross-compile.yml
+++ b/.github/workflows/zig-cross-compile.yml
@@ -14,6 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         zig_version: [ "0.12.0" ]
+        enable_cplusplus: [ true ]
         # Some of the triples are commented out just to speedup this workflow.
         ttriple: [
           aarch64-linux-gnu,
@@ -125,5 +126,6 @@ jobs:
         zig build -Dtarget=${{ matrix.ttriple }}
         -DBUILD_SHARED_LIBS=${{ matrix.shared_libs }}
         -DCFLAGS_EXTRA="${{ matrix.cflags_extra }}"
+        -Denable_cplusplus=${{ matrix.enable_cplusplus }}
         -Denable_threads=${{ matrix.enable_threads }}
         -Denable_werror
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index bfa15baba..000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,867 +0,0 @@
-language: cpp
-os: linux
-dist: jammy
-
-jobs:
-  include:
-  - compiler: clang
-    env:
-    - CONF_OPTIONS="--enable-cplusplus"
-    - GCTEST_WITH_MPROTECT_VDB=true
-    - NO_CLONE_LIBATOMIC_OPS=true
-  - compiler: gcc
-    env:
-    - CONF_OPTIONS="--enable-cplusplus"
-    - GCTEST_WITH_MPROTECT_VDB=true
-  - os: osx
-    env:
-    - CONF_OPTIONS="--enable-cplusplus"
-    - NO_CLONE_LIBATOMIC_OPS=true
-  - env:
-    - COVERITY_SCAN_BRANCH=1
-    addons:
-      coverity_scan:
-        project:
-          name: ivmai/bdwgc
-          version: 8.3.0
-        notification_email: ivmai@mail.ru
-        branch_pattern: master
-        build_command_prepend: "./configure --enable-cplusplus --disable-shared --enable-single-obj-compilation"
-        build_command: make -j check CFLAGS_EXTRA=-DLINT2
-  - addons:
-      apt:
-        packages:
-        - lcov
-    compiler: gcc
-    env:
-    - CONF_OPTIONS="--enable-gcov --enable-single-obj-compilation --enable-cplusplus --disable-shared --enable-gc-assertions --enable-valgrind-tracking"
-    - CFLAGS_EXTRA="-D USE_CUSTOM_SPECIFIC"
-    - CC_FOR_CHECK=g++
-    - MAKEFILE_TARGETS="all"
-    - MAKEFILE_TARGETS_CHECK="check"
-    - NO_CLONE_LIBATOMIC_OPS=true
-    - REPORT_COVERAGE=true
-    - TESTS_CUSTOM_RUN=true
-  - env:
-    - MAKEFILE_TARGETS="dist"
-  - os: osx
-    env:
-    - CSA_CHECK=true
-    - CFLAGS_EXTRA="-m32"
-  - compiler: clang
-    language: c
-    env:
-    - CSA_CHECK=true
-    - CFLAGS_EXTRA="-D ALL_INTERIOR_POINTERS -D CHECKSUMS -D DBG_HDRS_ALL -D DEBUG_THREADS -D ENABLE_TRACE -D GC_ALWAYS_MULTITHREADED -D GC_ASSERTIONS -D GC_ATOMIC_UNCOLLECTABLE -D GC_ENABLE_SUSPEND_THREAD -D GC_GCJ_SUPPORT -D GC_PRINT_BACK_HEIGHT -D GC_THREADS -D HANDLE_FORK -D JAVA_FINALIZATION -D KEEP_BACK_PTRS -D MAKE_BACK_GRAPH -D PARALLEL_MARK -D PRINT_BLACK_LIST -D THREAD_LOCAL_ALLOC -D USE_MMAP -D USE_MUNMAP"
-  - env:
-    - CPPCHECK_ENABLE="--enable=unusedFunction -I libatomic_ops/src extra/gc.c tests/*.c"
-  - env:
-    - CPPCHECK_ENABLE="--enable=unusedFunction --force -D GC_BUILTIN_ATOMIC *.cc cord/*.c cord/tests/*.c tests/*.c"
-    - CPPCHECK_OUT_FILTER="Z"
-    - NO_CLONE_LIBATOMIC_OPS=true
-  - env:
-    - CPPCHECK_ENABLE="-j4 --enable=all --disable=missingInclude,unusedFunction --force -U GC_PRIVATE_H -I libatomic_ops/src a*.c b*.c c*.c d*.c"
-    - CPPCHECK_OUT_FILTER="Z"
-  - env:
-    - CPPCHECK_ENABLE="-j4 --enable=all --disable=missingInclude,unusedFunction --force -U GC_PRIVATE_H -I libatomic_ops/src f*.c g*.c h*.c m*.c"
-    - CPPCHECK_OUT_FILTER="Z"
-  - env:
-    - CPPCHECK_ENABLE="-j4 --enable=all --disable=missingInclude,unusedFunction --force -U GC_PRIVATE_H -I libatomic_ops/src n*.c o*.c p*.c r*.c s*.c t*.c w*.c cord/*.c"
-  - env:
-    - CPPCHECK_ENABLE="-j4 --enable=all --disable=missingInclude,unusedFunction --force -I libatomic_ops/src *.cc cord/tests/*.c extra/ms*.c extra/*.cpp tests/*.c tests/*.cc tools/i*.c tools/t*.c"
-    - CPPCHECK_OUT_FILTER="Z"
-  - arch: arm64
-    compiler: clang
-  - arch: arm64
-    compiler: gcc
-  - arch: arm64
-    compiler: clang
-    env:
-    - CFLAGS_EXTRA="-O3"
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-    language: c
-    env:
-    - CFLAGS_EXTRA="-O3 -fsanitize=thread -fno-omit-frame-pointer"
-    - CONF_OPTIONS="--enable-static"
-    - NO_CLONE_LIBATOMIC_OPS=true
-  - compiler: clang
-    dist: focal
-    env:
-    - CFLAGS_EXTRA="-fsanitize=thread -D NO_INCREMENTAL -fno-omit-frame-pointer -D TEST_FORK_WITHOUT_ATFORK"
-    - CONF_OPTIONS="--enable-gc-assertions --enable-gc-debug --enable-handle-fork=manual --enable-large-config --without-libatomic-ops"
-  - compiler: clang
-    env:
-    - CFLAGS_EXTRA="-fsanitize=thread -D NO_INCREMENTAL -fno-omit-frame-pointer -D NTHREADS=0"
-    - CONF_OPTIONS="--disable-parallel-mark --disable-thread-local-alloc --disable-shared --enable-gc-assertions --without-libatomic-ops"
-  - compiler: clang
-    env:
-    - CFLAGS_EXTRA="-O3 -march=native -D NTHREADS=10"
-    - CONF_OPTIONS="--enable-cplusplus --enable-static --enable-single-obj-compilation"
-    - GCTEST_WITH_MPROTECT_VDB=true
-    - NO_CLONE_LIBATOMIC_OPS=true
-  - addons:
-      apt:
-        packages:
-        - gcc-multilib
-    compiler: clang
-    env:
-    - CFLAGS_EXTRA="-m32 -D _FORTIFY_SOURCE=2 -D GC_DISABLE_INCREMENTAL -std=gnu11"
-    - CONF_OPTIONS="--enable-gc-assertions --enable-gc-debug"
-    - NO_CLONE_LIBATOMIC_OPS=true
-  - compiler: gcc
-    env:
-    - CONF_OPTIONS="--enable-cplusplus --enable-gc-assertions --enable-static"
-    - CFLAGS_EXTRA="-D VERY_SMALL_CONFIG"
-    - NO_CLONE_LIBATOMIC_OPS=true
-  - addons:
-      apt:
-        packages:
-        - gcc-multilib
-    compiler: gcc
-    env:
-    - CFLAGS_EXTRA="-m32 -O3 -std=gnu11"
-    - CONF_OPTIONS="--disable-shared --enable-static --enable-single-obj-compilation"
-    - GCTEST_WITH_MPROTECT_VDB=true
-    - NO_CLONE_LIBATOMIC_OPS=true
-  - addons:
-      apt:
-        packages:
-        - gcc-8
-        - gcc-8-multilib
-        - gcc-multilib
-    compiler: gcc-8
-    dist: focal
-    language: c
-    env:
-    - CFLAGS_EXTRA="-mx32 -march=native -D _FORTIFY_SOURCE=2"
-    - CONF_OPTIONS="--enable-large-config --enable-gc-assertions"
-    - GCTEST_WITH_MPROTECT_VDB=true
-    - NO_CLONE_LIBATOMIC_OPS=true
-  - compiler: clang
-    env:
-    - CFLAGS_EXTRA="-x c++"
-    - CONF_OPTIONS="--enable-gc-assertions --enable-cplusplus --enable-gc-debug --disable-shared"
-    - MAKEFILE_TARGETS="all"
-    - NO_CLONE_LIBATOMIC_OPS=true
-  - compiler: gcc
-    env:
-    - CC_FOR_CHECK=g++
-    - CONF_OPTIONS="--enable-gc-assertions"
-    - MAKEFILE_TARGETS="all"
-    - MAKEFILE_TARGETS_CHECK="check"
-    - GCTEST_WITH_MPROTECT_VDB=true
-    - NO_CLONE_LIBATOMIC_OPS=true
-  - compiler: gcc
-    env:
-    - CC_FOR_CHECK=g++
-    - CFLAGS_EXTRA="-std=c++20"
-    - CONF_OPTIONS="--enable-cplusplus --enable-gc-assertions --enable-gc-debug"
-    - MAKEFILE_TARGETS="clean"
-    - MAKEFILE_TARGETS_CHECK="check"
-    - NO_CLONE_LIBATOMIC_OPS=true
-  - compiler: clang
-    env:
-    - CFLAGS_EXTRA="-O3 -Wall -Wextra -Werror -x c++"
-    - MAKEFILE_NAME=Makefile.direct
-    - MAKEFILE_TARGETS="cords"
-  - compiler: gcc
-    env:
-    - CC_FOR_CHECK=g++
-    - CFLAGS_EXTRA="-O3 -Wall -Wextra -Werror -D TEST_MANUAL_VDB"
-    - MAKEFILE_NAME=Makefile.direct
-    - MAKEFILE_TARGETS="cords"
-    - MAKEFILE_TARGETS_CHECK="cord/de check"
-  - addons:
-      apt:
-        packages:
-        - g++-mingw-w64
-        - gcc-mingw-w64
-    compiler: x86_64-w64-mingw32-gcc
-    language: c
-    env:
-    - CXX=x86_64-w64-mingw32-g++
-    - CONF_OPTIONS="--host=x86_64-w64-mingw32 --enable-cplusplus --disable-shared"
-    - MAKEFILE_TARGETS="all"
-  - addons:
-      apt:
-        packages:
-        - gcc-mingw-w64
-    compiler: x86_64-w64-mingw32-gcc
-    language: c
-    env:
-    - CONF_OPTIONS="--host=x86_64-w64-mingw32 --enable-gc-assertions --enable-gc-debug --enable-threads=pthreads"
-    - MAKEFILE_TARGETS="all"
-  - addons:
-      apt:
-        packages:
-        - gcc-mingw-w64
-    compiler: i686-w64-mingw32-gcc
-    language: c
-    env:
-    - CONF_OPTIONS="--host=i686-w64-mingw32"
-    - MAKEFILE_TARGETS="all"
-    - CFLAGS_EXTRA="-fno-omit-frame-pointer"
-  - dist: focal
-    env:
-    - MAKEFILE_TARGETS="distcheck"
-    - AUTOCONF_VER=2.72
-    - AUTOMAKE_VER=1.16.5
-    - LIBTOOL_VER=2.4.7
-    - M4_VER=1.4.19
-    - NO_CLONE_LIBATOMIC_OPS=true
-
-before_install:
-- if [[ "$CPPCHECK_ENABLE" != "" ]]; then
-    CPPCHECK_VER=2.13.3;
-    git clone --depth=3 https://github.com/danmar/cppcheck.git
-            ~/cppcheck -b $CPPCHECK_VER;
-    make --directory ~/cppcheck -j8 CXXFLAGS="-O3 -march=native -D NDEBUG";
-  fi
-- if [[ "$AUTOCONF_VER" != "" || "$AUTOMAKE_VER" != ""
-        || "$LIBTOOL_VER" != "" || "$M4_VER" != "" ]]; then
-    GNUTOOLS_ROOT=`pwd`/../gnu-tools;
-    export PATH=$GNUTOOLS_ROOT/bin:$PATH;
-    GNU_DOWNLOAD_SITE=https://ftp.gnu.org/gnu;
-  fi
-- if [[ "$M4_VER" != "" ]]; then
-    M4_XZ_URL=$GNU_DOWNLOAD_SITE/m4/m4-$M4_VER.tar.xz;
-    wget -O - $M4_XZ_URL | tar xf - --xz --directory ~;
-    (cd ~/m4-$M4_VER && ./configure --prefix=$GNUTOOLS_ROOT && make -j && make install);
-  fi
-- if [[ "$LIBTOOL_VER" != "" ]]; then
-    LIBTOOL_XZ_URL=$GNU_DOWNLOAD_SITE/libtool/libtool-$LIBTOOL_VER.tar.xz;
-    wget -O - $LIBTOOL_XZ_URL | tar xf - --xz --directory ~;
-    (cd ~/libtool-$LIBTOOL_VER && ./configure --prefix=$GNUTOOLS_ROOT && make -j && make install);
-  fi
-- if [[ "$AUTOCONF_VER" != "" ]]; then
-    AUTOCONF_XZ_URL=$GNU_DOWNLOAD_SITE/autoconf/autoconf-$AUTOCONF_VER.tar.xz;
-    wget -O - $AUTOCONF_XZ_URL | tar xf - --xz --directory ~;
-    (cd ~/autoconf-$AUTOCONF_VER && ./configure --prefix=$GNUTOOLS_ROOT && make -j && make install);
-  fi
-- if [[ "$AUTOMAKE_VER" != "" ]]; then
-    AUTOMAKE_XZ_URL=$GNU_DOWNLOAD_SITE/automake/automake-$AUTOMAKE_VER.tar.xz;
-    wget -O - $AUTOMAKE_XZ_URL | tar xf - --xz --directory ~;
-    (cd ~/automake-$AUTOMAKE_VER && ./configure --prefix=$GNUTOOLS_ROOT && make -j && make install);
-  fi
-- if [[ "$MAKEFILE_TARGETS" == *"dist"* ]]; then
-    autoconf --version;
-    automake --version;
-    m4 --version;
-    libtool --version || true;
-  fi
-- if [[ "$CMAKE_OPTIONS" != "" ]]; then
-    cmake --version;
-  fi
-- if [[ "$CONF_CFLAGS" == "" ]]; then CONF_CFLAGS="-g -O2"; fi
-- if [[ "$MAKEFILE_NAME" == "" ]]; then MAKEFILE_NAME=Makefile; fi
-- if [[ "$MAKEFILE_TARGETS" == "" ]]; then MAKEFILE_TARGETS="check"; fi
-
-install:
-- if [[ "$NO_CLONE_LIBATOMIC_OPS" != true ]]; then
-    git clone --depth=50 https://github.com/ivmai/libatomic_ops.git;
-  fi
-- if [[ "$CMAKE_OPTIONS" == "" ]]; then
-    ./autogen.sh;
-  fi
-- if [[ "$GNUTOOLS_ROOT" != "" ]]; then mv $GNUTOOLS_ROOT $GNUTOOLS_ROOT-x; fi
-- if [[ "$REPORT_COVERAGE" == true ]]; then gem install coveralls-lcov; fi
-
-script:
-- if [[ "$CSA_CHECK" != true && "$CMAKE_OPTIONS" == ""
-        && "$CPPCHECK_ENABLE" == "" && "$MAKEFILE_NAME" != "Makefile.direct"
-        && "$COVERITY_SCAN_BRANCH" != 1 ]]; then
-    CFLAGS="$CONF_CFLAGS" ./configure $CONF_OPTIONS --enable-werror &&
-    cat include/config.h;
-  fi
-- if [[ "$CSA_CHECK" != true && "$CMAKE_OPTIONS" == ""
-        && "$CPPCHECK_ENABLE" == "" && "$COVERITY_SCAN_BRANCH" != 1 ]]; then
-    make -j$MAKE_NPROC -f $MAKEFILE_NAME $MAKEFILE_TARGETS
-         CFLAGS_EXTRA="$CFLAGS_EXTRA" LDFLAGS="$LDFLAGS";
-  fi
-- if [[ "$CMAKE_OPTIONS" != "" ]]; then
-    cmake $CMAKE_OPTIONS -Dbuild_tests=ON -Denable_werror=ON -Werror=dev .
-    && cmake --build . $CMAKE_BUILD_OPTIONS --parallel;
-  fi
-- if [[ "$CMAKE_OPTIONS" != "" ]]; then
-    ctest --verbose --parallel 4;
-  fi
-- if [[ "$CC_FOR_CHECK" != "" ]]; then
-    make -f $MAKEFILE_NAME $MAKEFILE_TARGETS_CHECK CC=$CC_FOR_CHECK
-            CFLAGS_EXTRA="$CFLAGS_EXTRA";
-  fi
-- if [ -f cordtest.log ]; then cat cordtest.log; fi
-- if [ -f disclaim_bench.log ]; then cat disclaim_bench.log; fi
-- if [ -f disclaimtest.log ]; then cat disclaimtest.log; fi
-- if [ -f gctest.log ]; then cat gctest.log; fi
-- if [ -f threadkeytest.log ]; then cat threadkeytest.log; fi
-- if [ -f threadleaktest.log ]; then cat threadleaktest.log; fi
-- if [ -f weakmaptest.log ]; then cat weakmaptest.log; fi
-- if [[ "$CSA_CHECK" == true ]]; then
-    set -o pipefail; ${CC} --analyze -Xanalyzer -analyzer-output=text -Werror
-        -I include -I libatomic_ops/src $CFLAGS_EXTRA
-        *.c *.cc cord/*.c cord/tests/cordtest.c cord/tests/de.c extra/gc.c
-        extra/msvc_dbg.c extra/pcr_interface.c extra/real_malloc.c
-        tests/*.c tests/*.cc tools/*.c 2>&1 | tee clang-analyzer-output.log;
-    if [ -s clang-analyzer-output.log ]; then exit 1; fi;
-  fi
-- if [[ "$CPPCHECK_ENABLE" != "" ]]; then
-    if [[ "$CPPCHECK_OUT_FILTER" == "" ]]; then CPPCHECK_OUT_FILTER="c "; fi;
-    set -o pipefail; ~/cppcheck/cppcheck --error-exitcode=2 -D CPPCHECK
-        -I include $CPPCHECK_ENABLE |
-        grep --line-buffered "$CPPCHECK_OUT_FILTER";
-  fi
-- if [[ "$TESTS_CUSTOM_RUN" == true ]]; then
-    ASAN_OPTIONS="detect_leaks=1" UBSAN_OPTIONS="halt_on_error=1"
-        make check-without-test-driver;
-  fi
-- if [[ "$GCTEST_WITH_MPROTECT_VDB" == true ]]; then
-    GC_USE_GETWRITEWATCH=0 ./gctest;
-  fi
-
-after_success:
-- if [[ "$REPORT_COVERAGE" == true ]]; then
-    lcov --capture --base-directory . --directory . --output-file coverage.info;
-    lcov --remove coverage.info '/usr/*' 'cord/tests/*' 'libatomic_ops/*' 'tests/*' --output-file coverage.info;
-    lcov --list coverage.info;
-    coveralls-lcov --repo-token ${COVERALLS_TOKEN} coverage.info;
-    bash <(curl -s https://codecov.io/bash);
-  fi
-
-deploy:
-  provider: releases
-  edge: true
-  file: gc-*.tar.gz
-  file_glob: true
-  on:
-    condition: $MAKEFILE_TARGETS = distcheck
-    repo: ivmai/bdwgc
-    tags: true
diff --git a/build.zig b/build.zig
index 666764591..555662cfb 100644
--- a/build.zig
+++ b/build.zig
@@ -48,7 +48,8 @@ pub fn build(b: *std.Build) void {
     const default_enable_threads = !t.isWasm(); // both emscripten and wasi
 
     // Customize build by passing "-D<option_name>[=false]" in command line.
-    // TODO: support enable_cplusplus
+    const enable_cplusplus = b.option(bool, "enable_cplusplus",
+                                      "C++ support") orelse false;
     const build_shared_libs = b.option(bool, "BUILD_SHARED_LIBS",
                 "Build shared libraries (otherwise static ones)") orelse true;
     const build_cord = b.option(bool, "build_cord",
@@ -68,7 +69,9 @@ pub fn build(b: *std.Build) void {
         "Enable threads discovery in GC") orelse true;
     const enable_rwlock = b.option(bool, "enable_rwlock",
         "Enable reader mode of the allocator lock") orelse false;
-    // TODO: support enable_throw_bad_alloc_library
+    const enable_throw_bad_alloc_library = b.option(bool,
+        "enable_throw_bad_alloc_library",
+        "Turn on C++ gctba library build") orelse true;
     const enable_gcj_support = b.option(bool, "enable_gcj_support",
                                         "Support for gcj") orelse true;
     const enable_sigrt_signals = b.option(bool, "enable_sigrt_signals",
@@ -476,6 +479,24 @@ pub fn build(b: *std.Build) void {
         flags.append("-D NO_MPROTECT_VDB") catch unreachable;
     }
 
+    if (enable_cplusplus and enable_werror) {
+        if (build_shared_libs and t.os.tag == .windows or t.abi == .msvc) {
+            // Avoid "replacement operator new[] cannot be declared inline"
+            // warnings.
+            flags.appendSlice(&.{
+                "-Wno-inline-new-delete",
+            }) catch unreachable;
+        }
+        if (t.abi == .msvc) {
+            // TODO: as of zig 0.12,
+            // "argument unused during compilation: -nostdinc++" warning is
+            // reported if using MS compiler.
+            flags.appendSlice(&.{
+                "-Wno-unused-command-line-argument",
+            }) catch unreachable;
+        }
+    }
+
     if (build_cord and enable_werror and !enable_threads
         and (t.abi == .gnueabi or t.abi == .gnueabihf or t.abi == .musleabi
              or t.abi == .musleabihf)) {
@@ -501,6 +522,61 @@ pub fn build(b: *std.Build) void {
     gc.addIncludePath(b.path("include"));
     gc.linkLibC();
 
+    var gccpp = b.addStaticLibrary(.{
+        .name = "gccpp",
+        .target = target,
+        .optimize = optimize,
+    });
+    var gctba = b.addStaticLibrary(.{
+        .name = "gctba",
+        .target = target,
+        .optimize = optimize,
+    });
+    if (enable_cplusplus) {
+        if (build_shared_libs) {
+            gccpp = b.addSharedLibrary(.{
+                .name = "gccpp",
+                .target = target,
+                .optimize = optimize,
+            });
+        }
+        var gccpp_src_files = std.ArrayList([]const u8).init(b.allocator);
+        defer gccpp_src_files.deinit();
+        gccpp_src_files.appendSlice(&.{
+            "gc_badalc.cc",
+            "gc_cpp.cc",
+        }) catch unreachable;
+        gccpp.addCSourceFiles(.{
+            .files = gccpp_src_files.items,
+            .flags = flags.items,
+        });
+        gccpp.addIncludePath(b.path("include"));
+        gccpp.linkLibrary(gc);
+        linkLibCpp(gccpp);
+        if (enable_throw_bad_alloc_library) {
+            // The same as gccpp but contains only gc_badalc.
+            if (build_shared_libs) {
+                gctba = b.addSharedLibrary(.{
+                    .name = "gctba",
+                    .target = target,
+                    .optimize = optimize,
+                });
+            }
+            var gctba_src_files = std.ArrayList([]const u8).init(b.allocator);
+            defer gctba_src_files.deinit();
+            gctba_src_files.appendSlice(&.{
+                "gc_badalc.cc",
+            }) catch unreachable;
+            gctba.addCSourceFiles(.{
+                .files = gctba_src_files.items,
+                .flags = flags.items,
+            });
+            gctba.addIncludePath(b.path("include"));
+            gctba.linkLibrary(gc);
+            linkLibCpp(gctba);
+       }
+    }
+
     var cord = b.addStaticLibrary(.{
         .name = "cord",
         .target = target,
@@ -542,6 +618,17 @@ pub fn build(b: *std.Build) void {
         installHeader(b, gc, "gc/gc_version.h");
         installHeader(b, gc, "gc/javaxfc.h");
         installHeader(b, gc, "gc/leak_detector.h");
+        if (enable_cplusplus) {
+            installHeader(b, gccpp, "gc_cpp.h");
+            installHeader(b, gccpp, "gc/gc_allocator.h");
+            installHeader(b, gccpp, "gc/gc_cpp.h");
+            if (enable_throw_bad_alloc_library) {
+                // The same headers as gccpp library has.
+                installHeader(b, gctba, "gc_cpp.h");
+                installHeader(b, gctba, "gc/gc_allocator.h");
+                installHeader(b, gctba, "gc/gc_cpp.h");
+            }
+        }
         if (enable_disclaim) {
             installHeader(b, gc, "gc/gc_disclaim.h");
         }
@@ -560,6 +647,12 @@ pub fn build(b: *std.Build) void {
     }
 
     b.installArtifact(gc);
+    if (enable_cplusplus) {
+        b.installArtifact(gccpp);
+        if (enable_throw_bad_alloc_library) {
+            b.installArtifact(gctba);
+        }
+    }
     if (build_cord) {
         b.installArtifact(cord);
     }
@@ -595,6 +688,10 @@ pub fn build(b: *std.Build) void {
                     "threadkeytest", "tests/threadkey.c");
         }
     }
+    if (enable_cplusplus) {
+        addTestExt(b, gc, gccpp, test_step, flags,
+                   "cpptest", "tests/cpp.cc");
+    }
     if (enable_disclaim) {
         addTest(b, gc, test_step, flags,
                 "disclaim_bench", "tests/disclaim_bench.c");
@@ -603,6 +700,17 @@ pub fn build(b: *std.Build) void {
     }
 }
 
+fn linkLibCpp(lib: *std.Build.Step.Compile) void {
+    const t = lib.rootModuleTarget();
+    if (t.abi != .msvc) {
+        lib.linkLibCpp();
+    } else {
+        // TODO: as of zig 0.12, "unable to build libcxxabi" warning is
+        // reported if linking C++ code using MS compiler.
+        lib.linkLibC();
+    }
+}
+
 fn addTest(b: *std.Build, gc: *std.Build.Step.Compile,
            test_step: *std.Build.Step, flags: std.ArrayList([]const u8),
            testname: []const u8, filename: []const u8) void {