fluent · mabrarov · Apr 4, 2026 · Apr 4, 2026 · Jan 25, 2026 · Jan 25, 2026
@@ -413,6 +413,26 @@ jobs:
           username: ${{ inputs.username }}
           password: ${{ secrets.token }}
 
+      # https://github.com/actions/runner-images/issues/12199
+      # https://github.com/moby/moby/issues/48093
+      # https://support.microsoft.com/en-us/topic/gettemppath-changes-in-windows-february-cumulative-update-preview-4cc631fb-9d97-4118-ab6d-f643cd0a7259#ID0EDF
+      - name: Change system temp directory to the drive having sufficient disk space
+        id: relocate-system-temp-dir
+        run: |
+          $ErrorActionPreference = "Stop"
+          if (Test-Path -Path "D:\") {
+            $newSystemTempDir = "D:\SystemTemp"
+            New-Item -ItemType Directory -Path "${newSystemTempDir}" -Force
+            $acl = New-Object System.Security.AccessControl.DirectorySecurity
+            $acl.SetSecurityDescriptorSddlForm("O:SYG:SYD:PAI(A;OICI;FA;;;SY)(A;OICI;FA;;;BA)")
+            Set-Acl "${newSystemTempDir}" -AclObject ${acl}
+            [Environment]::SetEnvironmentVariable("SYSTEMTEMP", "${newSystemTempDir}", [EnvironmentVariableTarget]::Machine)
+            Restart-Service docker
+          } else {
+            Write-Warning "Drive D doesn't exist, so there is no disk to relocate system temp directory"
+          }
+        shell: pwsh
+
       - name: Pull the last release image to speed up the build with a cache
         continue-on-error: true
         run: |

@@ -108,6 +108,26 @@ jobs:
             flavor: |
               suffix=-windows-${{ matrix.windows-base-version }}
 
+        # https://github.com/actions/runner-images/issues/12199
+        # https://github.com/moby/moby/issues/48093
+        # https://support.microsoft.com/en-us/topic/gettemppath-changes-in-windows-february-cumulative-update-preview-4cc631fb-9d97-4118-ab6d-f643cd0a7259#ID0EDF
+        - name: Change system temp directory to the drive having sufficient disk space
+          id: relocate-system-temp-dir
+          run: |
+            $ErrorActionPreference = "Stop"
+            if (Test-Path -Path "D:\") {
+              $newSystemTempDir = "D:\SystemTemp"
+              New-Item -ItemType Directory -Path "${newSystemTempDir}" -Force
+              $acl = New-Object System.Security.AccessControl.DirectorySecurity
+              $acl.SetSecurityDescriptorSddlForm("O:SYG:SYD:PAI(A;OICI;FA;;;SY)(A;OICI;FA;;;BA)")
+              Set-Acl "${newSystemTempDir}" -AclObject ${acl}
+              [Environment]::SetEnvironmentVariable("SYSTEMTEMP", "${newSystemTempDir}", [EnvironmentVariableTarget]::Machine)
+              Restart-Service docker
+            } else {
+              Write-Warning "Drive D doesn't exist, so there is no disk to relocate system temp directory"
+            }
+          shell: pwsh
+
         - name: Build the windows images
           id: build
           run: |

@@ -56,33 +56,52 @@ if(CMAKE_SYSTEM_NAME MATCHES "Linux")
   endif()
 endif()
 
+set(FLB_EXTRA_CMAKE_CXX_FLAGS)
+set(FLB_EXTRA_CMAKE_CXX_LINK_FLAGS)
+
+# For consistency with MSVC debug C/C++ runtime (/MTd and /MDd options),
+# which is used for the Debug build and which automatically adds _DEBUG.
+add_compile_definitions($<$<CONFIG:Debug>:_DEBUG>)
+
 # Update CFLAGS
 if (MSVC)
+  # Use static C runtime
+  if (NOT (CMAKE_VERSION VERSION_LESS "3.15"))
+    set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
+  endif()
+  add_compile_options(/MT$<$<CONFIG:Debug>:d>)
+  # Replace (/|-)MD(d?) with (/|-)MT(d?) to avoid D9025 warning
+  foreach(config_type ${CMAKE_CONFIGURATION_TYPES} ${CMAKE_BUILD_TYPE} Debug Release RelWithDebInfo MinSizeRel)
+    string(TOUPPER ${config_type} upper_config_type)
+    set(flag_var "CMAKE_C_FLAGS_${upper_config_type}")
+    string(REGEX REPLACE "(^| |\\t|\\r|\\n)(-|/)(MD)(d?)($| |\\t|\\r|\\n)" "\\1\\2MT\\4\\5" ${flag_var} "${${flag_var}}")
+  endforeach()
+  set(flag_var)
+  set(upper_config_type)
+  set(config_type)
+
+  # Make compiler aware of source code using UTF-8 encoding
+  add_compile_options(/utf-8)
+
   add_definitions(-D_CRT_SECURE_NO_WARNINGS)
   add_definitions(-D_CRT_NONSTDC_NO_WARNINGS)
 
   # Use custom CFLAGS for MSVC
   #
   #   /Zi ...... Generate pdb files.
-  #   /MT ...... Static link C runtimes.
   #   /wd4711 .. C4711 (function selected for inline expansion)
   #   /wd4100 .. C4100 (unreferenced formal parameter)
   #   /wd5045 .. C5045 (Spectre mitigation)
   #
   # Restore /OPT:REF after setting /Debug, enable /OPT:ICF for 64-bit
   # builds per Microsoft recommended best practices.
-  set(CMAKE_C_FLAGS "/DWIN32 /D_WINDOWS /DNDEBUG /O2 /Zi /wd4100 /wd4711 /wd5045")
+  set(CMAKE_C_FLAGS "/DWIN32 /D_WINDOWS /Zi /wd4100 /wd4711 /wd5045")
   set(CMAKE_EXE_LINKER_FLAGS "/DEBUG /OPT:REF /INCREMENTAL:NO")
   set(CMAKE_SHARED_LINKER_FLAGS "/DEBUG /OPT:REF /INCREMENTAL:NO")
-  set(CMAKE_BUILD_TYPE None)
   if (CMAKE_SIZEOF_VOID_P EQUAL 8)
     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /OPT:ICF")
     set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /OPT:ICF")
   endif()
-
-  # Use add_compile_options() to set /MT since Visual Studio
-  # Generator does not notice /MT in CMAKE_C_FLAGS.
-  add_compile_options(/MT)
 else()
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
   if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
@@ -104,17 +123,23 @@ else()
   endif()
 endif()
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__FLB_FILENAME__=__FILE__")
+add_compile_definitions(__FLB_FILENAME__=__FILE__)
 
 if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "armv7l")
   set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -latomic")
-  set(CMAKE_CXX_LINK_FLAGS "${CMAKE_CXX_LINK_FLAGS} -latomic")
+  # CMAKE_CXX_LINK_FLAGS will be extended with FLB_EXTRA_CMAKE_CXX_LINK_FLAGS,
+  # when / if C++ language support will be enabled.
+  # Until C++ language support is enabled, CMAKE_CXX_LINK_FLAGS is empty / undefined.
+  set(FLB_EXTRA_CMAKE_CXX_LINK_FLAGS "${FLB_EXTRA_CMAKE_CXX_LINK_FLAGS} -latomic")
 endif()
 if(${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
   set(FLB_SYSTEM_FREEBSD On)
   add_definitions(-DFLB_SYSTEM_FREEBSD)
   set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -lutil")
-  set(CMAKE_CXX_LINK_FLAGS "${CMAKE_CXX_LINK_FLAGS} -lutil")
+  # CMAKE_CXX_LINK_FLAGS will be extended with FLB_EXTRA_CMAKE_CXX_LINK_FLAGS,
+  # when / if C++ language support will be enabled.
+  # Until C++ language support is enabled, CMAKE_CXX_LINK_FLAGS is empty / undefined.
+  set(FLB_EXTRA_CMAKE_CXX_LINK_FLAGS "${FLB_EXTRA_CMAKE_CXX_LINK_FLAGS} -lutil")
 endif()
 
 # *BSD is not supported platform for wasm-micro-runtime except for FreeBSD.
@@ -525,9 +550,12 @@ if(FLB_UNICODE_ENCODER)
 endif()
 
 if(FLB_COVERAGE)
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -O0 --coverage -fprofile-arcs -ftest-coverage")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -O0 --coverage -fprofile-arcs -ftest-coverage -fprofile-update=atomic")
   if (FLB_UNICODE_ENCODER)
-    set(CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS} -g -O0 --coverage -fprofile-arcs -ftest-coverage")
+    # CMAKE_CXX_FLAGS will be extended with FLB_EXTRA_CMAKE_CXX_FLAGS,
+    # when / if C++ language support will be enabled.
+    # Until C++ language support is enabled, CMAKE_CXX_FLAGS is empty / undefined.
+    set(FLB_EXTRA_CMAKE_CXX_FLAGS "${FLB_EXTRA_CMAKE_CXX_FLAGS} -g -O0 --coverage -fprofile-arcs -ftest-coverage -fprofile-update=atomic")
   endif()
   set(CMAKE_BUILD_TYPE "Debug")
 endif()
@@ -544,9 +572,7 @@ if(FLB_COMPILER_STRICT_POINTER_TYPES)
 endif()
 
 # Enable Debug symbols if specified
-if(MSVC)
-  set(CMAKE_BUILD_TYPE None)  # Avoid flag conflicts (See CMakeList.txt:L18)
-elseif(FLB_RELEASE)
+if(FLB_RELEASE)
   set(CMAKE_BUILD_TYPE "RelWithDebInfo")
 elseif(FLB_DEBUG)
   set(CMAKE_BUILD_TYPE "Debug")
@@ -665,6 +691,12 @@ endif()
 
 # MPack
 add_definitions(-DMPACK_EXTENSIONS=1)
+# MPack read / write tracking seems to have issues with nested types,
+# so it needs to be disabled explicitly, because otherwise MPack
+# read / write tracking is automatically enabled for the Debug build
+# (when _DEBUG macro is defined) with some compilers, like MSVC
+# (refer to https://learn.microsoft.com/en-us/cpp/c-runtime-library/debug).
+add_definitions(-DMPACK_READ_TRACKING=0 -DMPACK_WRITE_TRACKING=0)
 add_subdirectory(${FLB_PATH_LIB_MPACK} EXCLUDE_FROM_ALL)
 
 # Miniz (zip)
@@ -757,13 +789,30 @@ if(FLB_UTF8_ENCODER)
   add_subdirectory(${FLB_PATH_LIB_TUTF8E} EXCLUDE_FROM_ALL)
 endif()
 
+# All cases when C++ language support is needed should be checked here
+if((FLB_UNICODE_ENCODER AND FLB_USE_SIMDUTF) OR FLB_RIPSER)
+  enable_language(CXX)
+
+  # Perform delayed modification / extension of CMAKE_CXX_* variables.
+  if(MSVC)
+    # Replace (/|-)MD(d?) with (/|-)MT(d?) to avoid D9025 warning
+    foreach(config_type ${CMAKE_CONFIGURATION_TYPES} ${CMAKE_BUILD_TYPE} Debug Release RelWithDebInfo MinSizeRel)
+      string(TOUPPER ${config_type} upper_config_type)
+      set(flag_var "CMAKE_CXX_FLAGS_${upper_config_type}")
+      string(REGEX REPLACE "(^| |\\t|\\r|\\n)(-|/)(MD)(d?)($| |\\t|\\r|\\n)" "\\1\\2MT\\4\\5" ${flag_var} "${${flag_var}}")
+    endforeach()
+    set(flag_var)
+    set(upper_config_type)
+    set(config_type)
+  endif()
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}${FLB_EXTRA_CMAKE_CXX_FLAGS}")
+  set(CMAKE_CXX_LINK_FLAGS "${CMAKE_CXX_LINK_FLAGS}${FLB_EXTRA_CMAKE_CXX_LINK_FLAGS}")
+
+  set(CMAKE_CXX_STANDARD 11)
+endif()
+
 # simdutf
 if(FLB_UNICODE_ENCODER AND FLB_USE_SIMDUTF)
-  if (NOT FLB_USE_SIMDUTF)
-    message(FATAL_ERROR "FLB_UNICODE_ENCODER requires FLB_USE_SIMDUTF")
-  endif()
-  enable_language(CXX)
-  set (CMAKE_CXX_STANDARD 11)
   add_subdirectory(${FLB_PATH_LIB_SIMDUTF} EXCLUDE_FROM_ALL)
   FLB_DEFINITION(FLB_HAVE_UNICODE_ENCODER)
 endif()
@@ -823,7 +872,9 @@ macro(MK_SET_OPTION option value)
   set(${option} ${value} CACHE INTERNAL "" FORCE)
 endmacro()
 MK_SET_OPTION(MK_SYSTEM_MALLOC    ON)
-MK_SET_OPTION(MK_DEBUG            ON)
+if(NOT MSVC)
+  MK_SET_OPTION(MK_DEBUG          ON)
+endif()
 
 # Monkey backend event loop
 if (FLB_EVENT_LOOP_EPOLL)
@@ -920,8 +971,6 @@ endif()
 
 # ripser
 if(FLB_RIPSER)
-  enable_language(CXX)
-  set (CMAKE_CXX_STANDARD 11)
   add_subdirectory(${FLB_PATH_LIB_RIPSER} EXCLUDE_FROM_ALL)
   FLB_DEFINITION(FLB_HAVE_RIPSER)
 endif()

@@ -746,54 +746,54 @@ The following steps have been tested on a Windows Server 2022 Datacenter edition
 2. **Install Flex and Bison**
     1. Create a new file called `setup-flex-bison.ps1` and paste the following script:
 
-    ```powershell
-    # Define variables for Flex and Bison
-    $flexBisonUrl = "https://sourceforge.net/projects/winflexbison/files/win_flex_bison3-latest.zip/download"
-    $downloadPath = "$env:TEMP\win_flex_bison.zip"
-    $extractPath = "C:\win_flex_bison"
-    $flexExe = "flex.exe"
-    $bisonExe = "bison.exe"
-
-    # Step 2: Download and Setup Flex and Bison
-    Write-Output "Downloading win_flex_bison..."
-    Invoke-WebRequest -Uri $flexBisonUrl -OutFile $downloadPath
-
-    # Create the extract directory if it does not exist
-    If (!(Test-Path -Path $extractPath)) {
-        New-Item -ItemType Directory -Path $extractPath
-    }
+        ```powershell
+        # Define variables for Flex and Bison
+        $flexBisonUrl = "https://sourceforge.net/projects/winflexbison/files/win_flex_bison3-latest.zip/download"
+        $downloadPath = "$env:TEMP\win_flex_bison.zip"
+        $extractPath = "C:\win_flex_bison"
+        $flexExe = "flex.exe"
+        $bisonExe = "bison.exe"
+
+        # Step 2: Download and Setup Flex and Bison
+        Write-Output "Downloading win_flex_bison..."
+        Invoke-WebRequest -Uri $flexBisonUrl -OutFile $downloadPath
+
+        # Create the extract directory if it does not exist
+        If (!(Test-Path -Path $extractPath)) {
+            New-Item -ItemType Directory -Path $extractPath
+        }
 
-    # Extract the zip file
-    Write-Output "Extracting win_flex_bison..."
-    Add-Type -AssemblyName System.IO.Compression.FileSystem
-    [System.IO.Compression.ZipFile]::ExtractToDirectory($downloadPath, $extractPath)
-
-    # Rename the executables
-    Write-Output "Renaming executables..."
-    Rename-Item "$extractPath\win_flex.exe" "$extractPath\$flexExe" -Force
-    Rename-Item "$extractPath\win_bison.exe" "$extractPath\$bisonExe" -Force
-
-    # Add Flex and Bison path to system environment variables
-    Write-Output "Adding Flex and Bison path to environment variables..."
-    $envPath = [System.Environment]::GetEnvironmentVariable("Path", "Machine")
-    If ($envPath -notlike "*$extractPath*") {
-        [System.Environment]::SetEnvironmentVariable("Path", "$envPath;$extractPath", "Machine")
-        Write-Output "Path updated. Please restart your command prompt to apply changes."
-    } else {
-        Write-Output "Path already contains the Flex and Bison directory."
-    }
+        # Extract the zip file
+        Write-Output "Extracting win_flex_bison..."
+        Add-Type -AssemblyName System.IO.Compression.FileSystem
+        [System.IO.Compression.ZipFile]::ExtractToDirectory($downloadPath, $extractPath)
+
+        # Rename the executables
+        Write-Output "Renaming executables..."
+        Rename-Item "$extractPath\win_flex.exe" "$extractPath\$flexExe" -Force
+        Rename-Item "$extractPath\win_bison.exe" "$extractPath\$bisonExe" -Force
+
+        # Add Flex and Bison path to system environment variables
+        Write-Output "Adding Flex and Bison path to environment variables..."
+        $envPath = [System.Environment]::GetEnvironmentVariable("Path", "Machine")
+        If ($envPath -notlike "*$extractPath*") {
+            [System.Environment]::SetEnvironmentVariable("Path", "$envPath;$extractPath", "Machine")
+            Write-Output "Path updated. Please restart your command prompt to apply changes."
+        } else {
+            Write-Output "Path already contains the Flex and Bison directory."
+        }
 
-    # Cleanup
-    Remove-Item $downloadPath
+        # Cleanup
+        Remove-Item $downloadPath
 
-    Write-Output "Flex and Bison setup complete."
-    ```
+        Write-Output "Flex and Bison setup complete."
+        ```
 
     2. Run the Script: Open PowerShell as administrator.
 
-    ```powershell
-    .\setup-flex-bison.ps1
-    ```
+        ```powershell
+        .\setup-flex-bison.ps1
+        ```
 
     3. Restart the command prompt: After the script completes, restart your command prompt or Visual Studio for the changes to take effect.
 
@@ -853,7 +853,7 @@ The following steps have been tested on a Windows Server 2022 Datacenter edition
 7. **Run the binary build**
 
     ```bash
-    cmake --build . --parallel 4 --clean-first
+    cmake --build . --config Release --parallel 4 --clean-first
     ```
 
     **Notes**:

@@ -47,10 +47,7 @@ RUN $msvs_build_tools_dist_name=\"vs_buildtools.exe\"; `
       \"--channelUri ${msvs_build_tools_channel}\", `
       \"--installChannelUri ${msvs_build_tools_channel}\", `
       '--add Microsoft.VisualStudio.Workload.VCTools', `
-      '--add Microsoft.VisualStudio.Workload.MSBuildTools', `
       '--add Microsoft.VisualStudio.Component.VC.Tools.x86.x64', `
-      '--add Microsoft.VisualStudio.Component.VC.CoreBuildTools', `
-      '--add Microsoft.VisualStudio.Component.VC.MSVC.143', `
       '--add Microsoft.VisualStudio.Component.Windows10SDK.19041' `
       -NoNewWindow -Wait -PassThru; `
     if (${p}.ExitCode -ne 0 -and ${p}.ExitCode -ne 3010) { `
@@ -94,6 +91,26 @@ RUN if ([System.Version] \"${env:CMAKE_VERSION}\" -ge [System.Version] \"3.20.0\
     Write-Host \"${env:PATH}\"; `
     [Environment]::SetEnvironmentVariable(\"PATH\", \"${env:PATH}\", [EnvironmentVariableTarget]::Machine);
 
+ENV NINJA_HOME="C:\ninja"
+ARG NINJA_VERSION="1.13.2"
+ARG NINJA_URL="https://github.com/ninja-build/ninja/releases/download"
+
+RUN $ninja_dist_name=\"ninja-win.zip\"; `
+    $ninja_dist=\"${env:TMP}\${ninja_dist_name}\"; `
+    $ninja_download_url=\"${env:NINJA_URL}/v${env:NINJA_VERSION}/${ninja_dist_name}\"; `
+    Write-Host \"Downloading Ninja...\"; `
+    Write-Host \"${ninja_download_url} -> ${ninja_dist}\"; `
+    Invoke-WebRequest -OutFile \"${ninja_dist}\" \"${ninja_download_url}\"; `
+    New-Item -Path \"${env:NINJA_HOME}\" -ItemType \"directory\"; `
+    Write-Host \"Extracting Ninja...\"; `
+    Write-Host \"${ninja_dist} -> ${env:NINJA_HOME}\"; `
+    Expand-Archive \"${ninja_dist}\" -Destination \"${env:NINJA_HOME}\"; `
+    Remove-Item -Force \"${ninja_dist}\"; `
+    $env:PATH=\"${env:PATH};${env:NINJA_HOME}\"; `
+    Write-Host \"Setting PATH...\"; `
+    Write-Host \"${env:PATH}\"; `
+    [Environment]::SetEnvironmentVariable(\"PATH\", \"${env:PATH}\", [EnvironmentVariableTarget]::Machine);
+
 ENV WIN_FLEX_BISON_VERSION="2.5.22" `
     WIN_FLEX_BISON_HOME="C:\WinFlexBison" `
     WIN_FLEX_BISON_DOWNLOAD_URL="https://github.com/lexxmark/winflexbison/releases/download"
@@ -181,17 +198,16 @@ COPY . /src/
 ARG BUILD_PARALLEL=1
 SHELL ["cmd", "/S", "/C"]
 RUN call "%MSVS_HOME%\VC\Auxiliary\Build\vcvars64.bat" && `
-    cmake -G "NMake Makefiles" `
+    cmake -G "Ninja" `
       -DOPENSSL_ROOT_DIR='C:\dev\vcpkg\packages\openssl_x64-windows-static' `
       -DFLB_LIBYAML_DIR='C:\dev\vcpkg\packages\libyaml_x64-windows-static' `
       -DFLB_SIMD=On `
-      -DCMAKE_BUILD_TYPE=Release `
       -DFLB_SHARED_LIB=Off `
       -DFLB_EXAMPLES=Off `
       -DFLB_DEBUG=Off `
       -DFLB_RELEASE=On `
       ..\ && `
-    cmake --build . --config Release -j "%BUILD_PARALLEL%"
+    cmake --build . -j "%BUILD_PARALLEL%"
 
 SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]