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zstd support
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121
ext/zstd/CMakeModules/AddZstdCompilationFlags.cmake
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121
ext/zstd/CMakeModules/AddZstdCompilationFlags.cmake
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include(CheckCXXCompilerFlag)
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include(CheckCCompilerFlag)
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# VERSION_GREATER_EQUAL requires CMake 3.7 or later.
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# https://cmake.org/cmake/help/latest/command/if.html#version-greater-equal
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if (CMAKE_VERSION VERSION_LESS 3.18)
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set(ZSTD_HAVE_CHECK_LINKER_FLAG false)
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else ()
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set(ZSTD_HAVE_CHECK_LINKER_FLAG true)
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endif ()
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if (ZSTD_HAVE_CHECK_LINKER_FLAG)
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include(CheckLinkerFlag)
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endif()
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function(EnableCompilerFlag _flag _C _CXX _LD)
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string(REGEX REPLACE "\\+" "PLUS" varname "${_flag}")
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string(REGEX REPLACE "[^A-Za-z0-9]+" "_" varname "${varname}")
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string(REGEX REPLACE "^_+" "" varname "${varname}")
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string(TOUPPER "${varname}" varname)
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if (_C)
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CHECK_C_COMPILER_FLAG(${_flag} C_FLAG_${varname})
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if (C_FLAG_${varname})
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_flag}" PARENT_SCOPE)
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endif ()
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endif ()
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if (_CXX)
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CHECK_CXX_COMPILER_FLAG(${_flag} CXX_FLAG_${varname})
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if (CXX_FLAG_${varname})
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}" PARENT_SCOPE)
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endif ()
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endif ()
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if (_LD)
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# We never add a linker flag with CMake < 3.18. We will
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# implement CHECK_LINKER_FLAG() like feature for CMake < 3.18
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# or require CMake >= 3.18 when we need to add a required
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# linker flag in future.
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#
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# We also skip linker flags check for MSVC compilers (which includes
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# clang-cl) since currently check_linker_flag() doesn't give correct
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# results for this configuration,
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# see: https://gitlab.kitware.com/cmake/cmake/-/issues/22023
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if (ZSTD_HAVE_CHECK_LINKER_FLAG AND NOT MSVC)
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CHECK_LINKER_FLAG(C ${_flag} LD_FLAG_${varname})
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else ()
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set(LD_FLAG_${varname} false)
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endif ()
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if (LD_FLAG_${varname})
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set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${_flag}" PARENT_SCOPE)
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set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${_flag}" PARENT_SCOPE)
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endif ()
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endif ()
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endfunction()
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macro(ADD_ZSTD_COMPILATION_FLAGS)
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if (CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang" OR MINGW) #Not only UNIX but also WIN32 for MinGW
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# It's possible to select the exact standard used for compilation.
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# It's not necessary, but can be employed for specific purposes.
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# Note that zstd source code is compatible with both C++98 and above
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# and C-gnu90 (c90 + long long + variadic macros ) and above
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# EnableCompilerFlag("-std=c++11" false true) # Set C++ compilation to c++11 standard
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# EnableCompilerFlag("-std=c99" true false) # Set C compiation to c99 standard
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if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND MSVC)
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# clang-cl normally maps -Wall to -Weverything.
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EnableCompilerFlag("/clang:-Wall" true true false)
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else ()
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EnableCompilerFlag("-Wall" true true false)
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endif ()
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EnableCompilerFlag("-Wextra" true true false)
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EnableCompilerFlag("-Wundef" true true false)
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EnableCompilerFlag("-Wshadow" true true false)
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EnableCompilerFlag("-Wcast-align" true true false)
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EnableCompilerFlag("-Wcast-qual" true true false)
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EnableCompilerFlag("-Wstrict-prototypes" true false false)
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# Enable asserts in Debug mode
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if (CMAKE_BUILD_TYPE MATCHES "Debug")
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EnableCompilerFlag("-DDEBUGLEVEL=1" true true false)
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endif ()
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# Add noexecstack flags
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# LDFLAGS
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EnableCompilerFlag("-z noexecstack" false false true)
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# CFLAGS & CXXFLAGS
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EnableCompilerFlag("-Qunused-arguments" true true false)
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EnableCompilerFlag("-Wa,--noexecstack" true true false)
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elseif (MSVC) # Add specific compilation flags for Windows Visual
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set(ACTIVATE_MULTITHREADED_COMPILATION "ON" CACHE BOOL "activate multi-threaded compilation (/MP flag)")
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if (CMAKE_GENERATOR MATCHES "Visual Studio" AND ACTIVATE_MULTITHREADED_COMPILATION)
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EnableCompilerFlag("/MP" true true false)
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endif ()
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# UNICODE SUPPORT
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EnableCompilerFlag("/D_UNICODE" true true false)
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EnableCompilerFlag("/DUNICODE" true true false)
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# Enable asserts in Debug mode
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if (CMAKE_BUILD_TYPE MATCHES "Debug")
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EnableCompilerFlag("/DDEBUGLEVEL=1" true true false)
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endif ()
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endif ()
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# Remove duplicates compilation flags
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foreach (flag_var CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
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CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO
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CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
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CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
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if( ${flag_var} )
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separate_arguments(${flag_var})
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string(REPLACE ";" " " ${flag_var} "${${flag_var}}")
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endif()
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endforeach ()
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if (MSVC AND ZSTD_USE_STATIC_RUNTIME)
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foreach (flag_var CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
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CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO
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CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
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CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
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if ( ${flag_var} )
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string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
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endif()
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endforeach ()
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endif ()
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endmacro()
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