1 # Distributed under the OSI-approved BSD 3-Clause License. See accompanying
2 # file Copyright.txt or https://cmake.org/licensing for details.
4 #-----------------------------------------------------------------------------
5 # set some special flags for different compilers
7 if(WIN32 AND CMAKE_C_COMPILER_ID STREQUAL "Intel")
11 if(WIN32 AND CMAKE_C_COMPILER_ID STREQUAL "Clang"
12 AND "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
13 set(_CLANG_MSVC_WINDOWS 1)
16 # Disable deprecation warnings for standard C functions.
17 # really only needed for newer versions of VS, but should
18 # not hurt other versions, and this will work into the
20 if(MSVC OR _INTEL_WINDOWS OR _CLANG_MSVC_WINDOWS)
21 add_compile_definitions(_CRT_SECURE_NO_DEPRECATE _CRT_NONSTDC_NO_DEPRECATE)
26 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_CXX_LINKER_WRAPPER_FLAG}-stack:10000000")
29 # MSVC 14.28 enables C5105, but the Windows SDK 10.0.18362.0 triggers it.
30 if(CMAKE_C_COMPILER_ID STREQUAL "MSVC" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 19.28)
31 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -wd5105")
32 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -wd5105")
35 if(_CLANG_MSVC_WINDOWS AND "x${CMAKE_CXX_COMPILER_FRONTEND_VARIANT}" STREQUAL "xGNU")
36 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Xlinker -stack:20000000")
39 #silence duplicate symbol warnings on AIX
40 if(CMAKE_SYSTEM_NAME MATCHES "AIX")
41 if(NOT CMAKE_COMPILER_IS_GNUCXX)
42 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -bhalt:5 ")
46 if(CMAKE_SYSTEM MATCHES "OSF1-V")
47 if(NOT CMAKE_COMPILER_IS_GNUCXX)
48 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -timplicit_local -no_implicit_include ")
52 # Workaround for short jump tables on PA-RISC
53 if(CMAKE_SYSTEM_PROCESSOR MATCHES "^parisc")
54 if(CMAKE_COMPILER_IS_GNUCC)
55 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mlong-calls")
57 if(CMAKE_COMPILER_IS_GNUCXX)
58 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mlong-calls")
62 # Use 64-bit off_t on 32-bit Linux
63 if (CMAKE_SYSTEM_NAME STREQUAL "Linux" AND CMAKE_SIZEOF_VOID_P EQUAL 4)
64 # ensure 64bit offsets are used for filesystem accesses for 32bit compilation
65 add_compile_definitions(_FILE_OFFSET_BITS=64)
68 # Workaround for TOC Overflow on ppc64
70 if(CMAKE_SYSTEM_NAME STREQUAL "AIX" AND
71 CMAKE_SYSTEM_PROCESSOR MATCHES "powerpc")
72 set(bigTocFlag "-Wl,-bbigtoc")
73 elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux" AND
74 CMAKE_SYSTEM_PROCESSOR MATCHES "ppc64")
75 set(bigTocFlag "-Wl,--no-multi-toc")
78 include(CheckCXXLinkerFlag)
79 check_cxx_linker_flag(${bigTocFlag} BIG_TOC_FLAG_SUPPORTED)
80 if(BIG_TOC_FLAG_SUPPORTED)
81 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${bigTocFlag}")
85 if (CMAKE_CXX_COMPILER_ID STREQUAL SunPro AND
86 NOT DEFINED CMAKE_CXX${CMAKE_CXX_STANDARD}_STANDARD_COMPILE_OPTION)
87 if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.13)
88 if (NOT CMAKE_CXX_STANDARD OR CMAKE_CXX_STANDARD EQUAL 98)
89 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++03")
90 elseif(CMAKE_VERSION VERSION_LESS 3.8.20170502)
91 # CMake knows how to add this flag for compilation as C++11,
92 # but has not been taught that SunPro needs it for linking too.
93 # Add it in a place that will be used for both.
94 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
97 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -library=stlport4")
101 foreach(lang IN ITEMS C CXX)
102 # Suppress warnings from PGI compiler.
103 if (CMAKE_${lang}_COMPILER_ID STREQUAL "PGI")
104 set(CMAKE_${lang}_FLAGS "${CMAKE_${lang}_FLAGS} -w")
108 # use the ansi CXX compile flag for building cmake
109 if (CMAKE_ANSI_CXXFLAGS)
110 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_ANSI_CXXFLAGS}")
113 if (CMAKE_ANSI_CFLAGS)
114 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CMAKE_ANSI_CFLAGS}")
117 # Allow per-translation-unit parallel builds when using MSVC
118 if(CMAKE_GENERATOR MATCHES "Visual Studio" AND
119 (CMAKE_C_COMPILER_ID MATCHES "MSVC|Intel" OR
120 CMAKE_CXX_COMPILER_ID MATCHES "MSVC|Intel"))
122 set(CMake_MSVC_PARALLEL ON CACHE STRING "\
123 Enables /MP flag for parallel builds using MSVC. Specify an \
124 integer value to control the number of threads used (Only \
125 works on some older versions of Visual Studio). Setting to \
126 ON lets the toolchain decide how many threads to use. Set to \
127 OFF to disable /MP completely." )
129 if(CMake_MSVC_PARALLEL)
130 if(CMake_MSVC_PARALLEL GREATER 0)
131 string(APPEND CMAKE_C_FLAGS " /MP${CMake_MSVC_PARALLEL}")
132 string(APPEND CMAKE_CXX_FLAGS " /MP${CMake_MSVC_PARALLEL}")
134 string(APPEND CMAKE_C_FLAGS " /MP")
135 string(APPEND CMAKE_CXX_FLAGS " /MP")
140 # Get rid of excess -Wunused-but-set-variable on release builds with LCC >= 1.26
141 foreach(l IN ITEMS C CXX)
142 if(CMAKE_${l}_COMPILER_ID STREQUAL "LCC" AND NOT CMAKE_${l}_COMPILER_VERSION VERSION_LESS 1.26)
143 foreach(c IN ITEMS MINSIZEREL RELEASE RELWITHDEBINFO)
144 string(APPEND "CMAKE_${l}_FLAGS_${c}" " -Wno-unused-but-set-variable")