1 include(CheckCXXCompilerFlag)
2 include(CheckCCompilerFlag)
3 # VERSION_GREATER_EQUAL requires CMake 3.7 or later.
4 # https://cmake.org/cmake/help/latest/command/if.html#version-greater-equal
5 if (CMAKE_VERSION VERSION_LESS 3.18)
6 set(ZSTD_HAVE_CHECK_LINKER_FLAG false)
8 set(ZSTD_HAVE_CHECK_LINKER_FLAG true)
10 if (ZSTD_HAVE_CHECK_LINKER_FLAG)
11 include(CheckLinkerFlag)
14 function(EnableCompilerFlag _flag _C _CXX _LD)
15 string(REGEX REPLACE "\\+" "PLUS" varname "${_flag}")
16 string(REGEX REPLACE "[^A-Za-z0-9]+" "_" varname "${varname}")
17 string(REGEX REPLACE "^_+" "" varname "${varname}")
18 string(TOUPPER "${varname}" varname)
20 CHECK_C_COMPILER_FLAG(${_flag} C_FLAG_${varname})
21 if (C_FLAG_${varname})
22 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_flag}" PARENT_SCOPE)
26 CHECK_CXX_COMPILER_FLAG(${_flag} CXX_FLAG_${varname})
27 if (CXX_FLAG_${varname})
28 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}" PARENT_SCOPE)
32 # We never add a linker flag with CMake < 3.18. We will
33 # implement CHECK_LINKER_FLAG() like feature for CMake < 3.18
34 # or require CMake >= 3.18 when we need to add a required
35 # linker flag in future.
37 # We also skip linker flags check for MSVC compilers (which includes
38 # clang-cl) since currently check_linker_flag() doesn't give correct
39 # results for this configuration,
40 # see: https://gitlab.kitware.com/cmake/cmake/-/issues/22023
41 if (ZSTD_HAVE_CHECK_LINKER_FLAG AND NOT MSVC)
42 CHECK_LINKER_FLAG(C ${_flag} LD_FLAG_${varname})
44 set(LD_FLAG_${varname} false)
46 if (LD_FLAG_${varname})
47 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${_flag}" PARENT_SCOPE)
48 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${_flag}" PARENT_SCOPE)
53 macro(ADD_ZSTD_COMPILATION_FLAGS)
54 if (CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang" OR MINGW) #Not only UNIX but also WIN32 for MinGW
55 # It's possible to select the exact standard used for compilation.
56 # It's not necessary, but can be employed for specific purposes.
57 # Note that zstd source code is compatible with both C++98 and above
58 # and C-gnu90 (c90 + long long + variadic macros ) and above
59 # EnableCompilerFlag("-std=c++11" false true) # Set C++ compilation to c++11 standard
60 # EnableCompilerFlag("-std=c99" true false) # Set C compiation to c99 standard
61 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND MSVC)
62 # clang-cl normally maps -Wall to -Weverything.
63 EnableCompilerFlag("/clang:-Wall" true true false)
65 EnableCompilerFlag("-Wall" true true false)
67 EnableCompilerFlag("-Wextra" true true false)
68 EnableCompilerFlag("-Wundef" true true false)
69 EnableCompilerFlag("-Wshadow" true true false)
70 EnableCompilerFlag("-Wcast-align" true true false)
71 EnableCompilerFlag("-Wcast-qual" true true false)
72 EnableCompilerFlag("-Wstrict-prototypes" true false false)
73 # Enable asserts in Debug mode
74 if (CMAKE_BUILD_TYPE MATCHES "Debug")
75 EnableCompilerFlag("-DDEBUGLEVEL=1" true true false)
77 # Add noexecstack flags
79 EnableCompilerFlag("-z noexecstack" false false true)
81 EnableCompilerFlag("-Qunused-arguments" true true false)
82 EnableCompilerFlag("-Wa,--noexecstack" true true false)
83 elseif (MSVC) # Add specific compilation flags for Windows Visual
85 set(ACTIVATE_MULTITHREADED_COMPILATION "ON" CACHE BOOL "activate multi-threaded compilation (/MP flag)")
86 if (CMAKE_GENERATOR MATCHES "Visual Studio" AND ACTIVATE_MULTITHREADED_COMPILATION)
87 EnableCompilerFlag("/MP" true true false)
91 EnableCompilerFlag("/D_UNICODE" true true false)
92 EnableCompilerFlag("/DUNICODE" true true false)
93 # Enable asserts in Debug mode
94 if (CMAKE_BUILD_TYPE MATCHES "Debug")
95 EnableCompilerFlag("/DDEBUGLEVEL=1" true true false)
99 # Remove duplicates compilation flags
100 foreach (flag_var CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
101 CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO
102 CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
103 CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
105 separate_arguments(${flag_var})
106 string(REPLACE ";" " " ${flag_var} "${${flag_var}}")
110 if (MSVC AND ZSTD_USE_STATIC_RUNTIME)
111 foreach (flag_var CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
112 CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO
113 CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
114 CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
116 string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")