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Merge pull request #4554 from facebook/no_legacy
Remove legacy support by default
2 parents e00ddf6 + 1dae4f0 commit ae9f20c

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15 files changed

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‎CHANGELOG‎

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v1.6.0 (Dec 2025)
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api: legacy format support is now disabled by default
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build: `ZSTD_LEGACY_SUPPORT` defaults to `0` in Makefile and CMake
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V1.5.7 (Feb 2025)
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fix: compression bug in 32-bit mode associated with long-lasting sessions
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api: new method `ZSTD_compressSequencesAndLiterals()` (#4217, #4232)

‎build/VS2008/zstd/zstd.vcproj‎

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Name="VCCLCompilerTool"
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Optimization="0"
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AdditionalIncludeDirectories="$(SolutionDir)..\..\lib;$(SolutionDir)..\..\lib\common;$(SolutionDir)..\..\lib\legacy;$(SolutionDir)..\..\lib\dictBuilder;$(SolutionDir)..\..\lib\compress"
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PreprocessorDefinitions="ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;_DEBUG;_CONSOLE"
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PreprocessorDefinitions="ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;_DEBUG;_CONSOLE"
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MinimalRebuild="true"
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BasicRuntimeChecks="3"
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RuntimeLibrary="3"
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EnableIntrinsicFunctions="true"
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OmitFramePointers="true"
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AdditionalIncludeDirectories="$(SolutionDir)..\..\lib;$(SolutionDir)..\..\lib\common;$(SolutionDir)..\..\lib\legacy;$(SolutionDir)..\..\lib\dictBuilder;$(SolutionDir)..\..\lib\compress"
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PreprocessorDefinitions="ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;NDEBUG;_CONSOLE"
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PreprocessorDefinitions="ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;NDEBUG;_CONSOLE"
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RuntimeLibrary="0"
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EnableFunctionLevelLinking="true"
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UsePrecompiledHeader="0"
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Name="VCCLCompilerTool"
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Optimization="0"
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AdditionalIncludeDirectories="$(SolutionDir)..\..\lib;$(SolutionDir)..\..\lib\common;$(SolutionDir)..\..\lib\legacy;$(SolutionDir)..\..\lib\dictBuilder;$(SolutionDir)..\..\lib\compress"
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PreprocessorDefinitions="ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;_DEBUG;_CONSOLE"
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PreprocessorDefinitions="ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;_DEBUG;_CONSOLE"
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MinimalRebuild="true"
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BasicRuntimeChecks="3"
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RuntimeLibrary="3"
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EnableIntrinsicFunctions="true"
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OmitFramePointers="true"
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AdditionalIncludeDirectories="$(SolutionDir)..\..\lib;$(SolutionDir)..\..\lib\common;$(SolutionDir)..\..\lib\legacy;$(SolutionDir)..\..\lib\dictBuilder;$(SolutionDir)..\..\lib\compress"
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PreprocessorDefinitions="ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;NDEBUG;_CONSOLE"
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PreprocessorDefinitions="ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;NDEBUG;_CONSOLE"
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RuntimeLibrary="0"
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EnableFunctionLevelLinking="true"
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UsePrecompiledHeader="0"

‎build/VS2008/zstdlib/zstdlib.vcproj‎

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Name="VCCLCompilerTool"
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Optimization="0"
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AdditionalIncludeDirectories="$(SolutionDir)..\..\lib;$(SolutionDir)..\..\lib\common;$(SolutionDir)..\..\lib\legacy;$(SolutionDir)..\..\programs\legacy;$(SolutionDir)..\..\lib\dictBuilder"
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PreprocessorDefinitions="ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;_DEBUG;_CONSOLE"
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PreprocessorDefinitions="ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;_DEBUG;_CONSOLE"
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MinimalRebuild="true"
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BasicRuntimeChecks="3"
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RuntimeLibrary="3"
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EnableIntrinsicFunctions="true"
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OmitFramePointers="true"
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AdditionalIncludeDirectories="$(SolutionDir)..\..\lib;$(SolutionDir)..\..\lib\common;$(SolutionDir)..\..\lib\legacy;$(SolutionDir)..\..\programs\legacy;$(SolutionDir)..\..\lib\dictBuilder"
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PreprocessorDefinitions="ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;NDEBUG;_CONSOLE"
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PreprocessorDefinitions="ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;NDEBUG;_CONSOLE"
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RuntimeLibrary="0"
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EnableFunctionLevelLinking="true"
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UsePrecompiledHeader="0"
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Name="VCCLCompilerTool"
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Optimization="0"
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AdditionalIncludeDirectories="$(SolutionDir)..\..\lib;$(SolutionDir)..\..\lib\common;$(SolutionDir)..\..\lib\legacy;$(SolutionDir)..\..\programs\legacy;$(SolutionDir)..\..\lib\dictBuilder"
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PreprocessorDefinitions="ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;_DEBUG;_CONSOLE"
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PreprocessorDefinitions="ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;_DEBUG;_CONSOLE"
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MinimalRebuild="true"
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BasicRuntimeChecks="3"
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RuntimeLibrary="3"
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EnableIntrinsicFunctions="true"
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OmitFramePointers="true"
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AdditionalIncludeDirectories="$(SolutionDir)..\..\lib;$(SolutionDir)..\..\lib\common;$(SolutionDir)..\..\lib\legacy;$(SolutionDir)..\..\programs\legacy;$(SolutionDir)..\..\lib\dictBuilder"
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PreprocessorDefinitions="ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;NDEBUG;_CONSOLE"
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PreprocessorDefinitions="ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;NDEBUG;_CONSOLE"
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RuntimeLibrary="0"
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EnableFunctionLevelLinking="true"
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UsePrecompiledHeader="0"

‎build/VS2010/libzstd-dll/libzstd-dll.vcxproj‎

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</PrecompiledHeader>
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<WarningLevel>Level4</WarningLevel>
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<Optimization>Disabled</Optimization>
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<PreprocessorDefinitions>ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;_DEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<PreprocessorDefinitions>ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;_DEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
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<RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
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<DebugInformationFormat>EditAndContinue</DebugInformationFormat>
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</PrecompiledHeader>
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<WarningLevel>Level4</WarningLevel>
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<Optimization>Disabled</Optimization>
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<PreprocessorDefinitions>ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;_DEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<PreprocessorDefinitions>ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;_DEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<TreatWarningAsError>true</TreatWarningAsError>
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<BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
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<RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
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<Optimization>MaxSpeed</Optimization>
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<FunctionLevelLinking>true</FunctionLevelLinking>
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<IntrinsicFunctions>true</IntrinsicFunctions>
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<PreprocessorDefinitions>ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;NDEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<PreprocessorDefinitions>ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;NDEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<EnablePREfast>false</EnablePREfast>
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<RuntimeLibrary>MultiThreaded</RuntimeLibrary>
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<DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
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<Optimization>MaxSpeed</Optimization>
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<FunctionLevelLinking>true</FunctionLevelLinking>
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<IntrinsicFunctions>true</IntrinsicFunctions>
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<PreprocessorDefinitions>ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;NDEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<PreprocessorDefinitions>ZSTD_DLL_EXPORT=1;ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;NDEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<TreatWarningAsError>false</TreatWarningAsError>
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<EnablePREfast>false</EnablePREfast>
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<RuntimeLibrary>MultiThreaded</RuntimeLibrary>

‎build/VS2010/libzstd/libzstd.vcxproj‎

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</PrecompiledHeader>
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<WarningLevel>Level4</WarningLevel>
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<Optimization>Disabled</Optimization>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;_DEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;_DEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
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<RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
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<DebugInformationFormat>EditAndContinue</DebugInformationFormat>
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</PrecompiledHeader>
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<WarningLevel>Level4</WarningLevel>
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<Optimization>Disabled</Optimization>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;_DEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;_DEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<TreatWarningAsError>true</TreatWarningAsError>
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<BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
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<RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
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<Optimization>MaxSpeed</Optimization>
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<FunctionLevelLinking>true</FunctionLevelLinking>
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<IntrinsicFunctions>true</IntrinsicFunctions>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;NDEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;NDEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<EnablePREfast>false</EnablePREfast>
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<RuntimeLibrary>MultiThreaded</RuntimeLibrary>
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<DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
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<Optimization>MaxSpeed</Optimization>
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<FunctionLevelLinking>true</FunctionLevelLinking>
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<IntrinsicFunctions>true</IntrinsicFunctions>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;NDEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;NDEBUG;_CONSOLE;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<TreatWarningAsError>false</TreatWarningAsError>
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<EnablePREfast>false</EnablePREfast>
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<RuntimeLibrary>MultiThreaded</RuntimeLibrary>

‎build/VS2010/zstd/zstd.vcxproj‎

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</PrecompiledHeader>
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<WarningLevel>Level4</WarningLevel>
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<Optimization>Disabled</Optimization>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<TreatWarningAsError>true</TreatWarningAsError>
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<EnablePREfast>false</EnablePREfast>
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<EnableEnhancedInstructionSet>$(InstructionSet)</EnableEnhancedInstructionSet>
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</PrecompiledHeader>
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<WarningLevel>Level4</WarningLevel>
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<Optimization>Disabled</Optimization>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<TreatWarningAsError>true</TreatWarningAsError>
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<EnablePREfast>false</EnablePREfast>
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<EnableEnhancedInstructionSet>$(InstructionSet)</EnableEnhancedInstructionSet>
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<Optimization>MaxSpeed</Optimization>
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<FunctionLevelLinking>true</FunctionLevelLinking>
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<IntrinsicFunctions>true</IntrinsicFunctions>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<EnablePREfast>false</EnablePREfast>
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<TreatWarningAsError>false</TreatWarningAsError>
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<RuntimeLibrary>MultiThreaded</RuntimeLibrary>
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<Optimization>MaxSpeed</Optimization>
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<FunctionLevelLinking>true</FunctionLevelLinking>
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<IntrinsicFunctions>true</IntrinsicFunctions>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=5;WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<PreprocessorDefinitions>ZSTD_MULTITHREAD=1;ZSTD_LEGACY_SUPPORT=0;WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<TreatWarningAsError>false</TreatWarningAsError>
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<EnablePREfast>false</EnablePREfast>
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<RuntimeLibrary>MultiThreaded</RuntimeLibrary>

‎build/cmake/CMakeModules/ZstdOptions.cmake‎

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# ZSTD Build Options Configuration
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# ################################################################
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# Legacy support configuration
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option(ZSTD_LEGACY_SUPPORT "Enable legacy format support" ON)
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# Legacy support configuration (disabled by default)
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option(ZSTD_LEGACY_SUPPORT "Enable legacy format support" OFF)
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if(ZSTD_LEGACY_SUPPORT)
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message(STATUS "ZSTD_LEGACY_SUPPORT enabled")

‎build/meson/meson_options.txt‎

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# Read guidelines from https://wiki.gnome.org/Initiatives/GnomeGoals/MesonPorting
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option('legacy_level', type: 'integer', min: 0, max: 7, value: 5,
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description: 'Support any legacy format: 7 to 1 for v0.7+ to v0.1+')
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option('legacy_level', type: 'integer', min: 0, max: 7, value: 0,
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description: 'Support legacy format: 0=disabled, 1-7=support v0.1+ to v0.7+')
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option('debug_level', type: 'integer', min: 0, max: 9, value: 1,
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description: 'Enable run-time debug. See lib/common/debug.h')
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option('backtrace', type: 'feature', value: 'disabled',

‎lib/BUCK‎

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srcs=glob(['legacy/*.c']),
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deps=[':common'],
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exported_preprocessor_flags=[
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'-DZSTD_LEGACY_SUPPORT=4',
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'-DZSTD_LEGACY_SUPPORT=0',
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],
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)
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‎lib/README.md‎

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- `make` : generates both static and dynamic libraries
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- `make install` : install libraries, headers and pkg-config in local system directories
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`libzstd` default scope is extensive, including compression, decompression, dictionary builder,
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and support for decoding legacy formats >= v0.5.0 by default.
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`libzstd` default scope includes compression, decompression, and dictionary builder.
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Note: starting v1.6.0, support for decoding legacy formats is disabled by default.
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See _modular build_ below to learn how to enable it.
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The scope can be reduced on demand (see paragraph _modular build_).
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#### Multiarch Support
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Specifying a number limits versions supported to that version onward.
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For example, `ZSTD_LEGACY_SUPPORT=2` means : "support legacy formats >= v0.2.0".
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Conversely, `ZSTD_LEGACY_SUPPORT=0` means "do __not__ support legacy formats".
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By default, this build macro is set as `ZSTD_LEGACY_SUPPORT=5`.
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By default, this build macro is set as `ZSTD_LEGACY_SUPPORT=0` (disabled).
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Decoding supported legacy format is a transparent capability triggered within decompression functions.
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It's also allowed to invoke legacy API directly, exposed in `lib/legacy/zstd_legacy.h`.
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Each version does also provide its own set of advanced API.

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