2 ## This file is in charge of setting our paranoid flags with regard to warnings and optimization.
4 ## It is only used for gcc and clang. MSVC builds don't load this file.
6 ## These flags do break some classical CMake tests, so you don't
7 ## want to do so before the very end of the configuration.
9 ## Other compiler flags (C/C++ standard version) are tested and set
10 ## by the beginning of the configuration, directly in ~/CMakeList.txt
16 if(enable_compile_warnings)
17 set(warnCFLAGS "-fno-common -Wall -Wextra -Wunused -Wmissing-declarations -Wpointer-arith -Wwrite-strings -Wno-unused-function -Wno-unused-parameter -Wno-strict-aliasing")
19 if (CMAKE_CXX_COMPILER_ID MATCHES "Intel")
21 # 191: type qualifier is meaningless on cast type
22 # 1418: external function definition with no prior declaration
23 # 2196: routine is both "inline" and "noinline"
24 # 2651: attribute does not apply to any entity
25 # 3179: deprecated conversion of string literal to char* (should be const char*)
27 # 597: entity-kind "entity" will not be called for implicit or explicit conversions
28 # 2330: argument of type "type" is incompatible with parameter of type "type" (dropping qualifiers)
29 # 11003: no IR in object file xxxx; was the source file compiled with xxxx
30 set(warnCFLAGS "${warnCFLAGS} -diag-disable=191,1418,2196,2651,3179 -diag-warning=597,2330,11003")
32 set(warnCXXFLAGS "${warnCFLAGS}")
34 if(CMAKE_COMPILER_IS_GNUCC)
35 set(warnCFLAGS "${warnCFLAGS} -Wclobbered -Wformat-signedness -Wno-error=clobbered -Wno-unused-local-typedefs -Wno-error=attributes -Wno-error=maybe-uninitialized")
38 if(CMAKE_COMPILER_IS_GNUCXX)
39 set(warnCXXFLAGS "${warnCXXFLAGS} -Wclobbered -Wformat-signedness -Wno-error=clobbered -Wno-free-nonheap-object -Wno-unused-local-typedefs -Wno-error=attributes -Wno-error=maybe-uninitialized")
40 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "8.0")
41 # workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81767
42 set(warnCXXFLAGS "${warnCXXFLAGS} -Wno-error=unused-variable")
46 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
47 # don't care about class that become struct, avoid issue of empty C structs
48 # size (coming from libunwind.h)
49 set(warnCXXFLAGS "${warnCXXFLAGS} -Wno-mismatched-tags -Wno-extern-c-compat")
50 # also ignore deprecated builtins (seen with clang 15 + boost 1.79)
51 if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "15.0")
52 set(warnCXXFLAGS "${warnCXXFLAGS} -Wno-deprecated-builtins")
56 # the one specific to C but refused by C++
57 set(warnCFLAGS "${warnCFLAGS} -Wmissing-prototypes")
59 if(CMAKE_Fortran_COMPILER_ID MATCHES "GCC|PGI")
60 set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -Wall")
61 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "Flang")
62 # flang >= 7 has a bug with common and debug flags. Ignore cmake-added -g in this case.
63 # https://github.com/flang-compiler/flang/issues/671
64 set(CMAKE_Fortran_FLAGS "-Wall")
65 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "Intel")
66 set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -warn all")
70 # NDEBUG gives a lot of "initialized but unused variables" errors. Don't die anyway.
71 if(enable_compile_warnings AND enable_debug)
72 set(warnCFLAGS "${warnCFLAGS} -Werror")
73 set(warnCXXFLAGS "${warnCXXFLAGS} -Werror")
74 if(CMAKE_Fortran_COMPILER_ID MATCHES "GCC")
75 set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -Werror -Werror=format-security")
79 # Activate the warnings on #if FOOBAR when FOOBAR has no value
80 # It breaks on FreeBSD within Boost headers, so activate this only in Pure Hardcore debug mode.
81 if(enable_maintainer_mode)
82 set(warnCFLAGS "${warnCFLAGS} -Wundef")
83 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wundef")
86 # Se the optimisation flags
87 # NOTE, we should CMAKE_BUILD_TYPE for this
88 if(enable_compile_optimizations)
89 set(optCFLAGS "-O3 -funroll-loops -fno-strict-aliasing ")
94 #ARM platforms have signed char by default, switch to unsigned for consistancy
95 if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "aarch64")
96 set(optCFLAGS "${optCFLAGS} -fsigned-char")
99 if(enable_compile_optimizations AND CMAKE_COMPILER_IS_GNUCC
100 AND (NOT enable_model-checking))
101 # This is redundant (already in -03):
102 set(optCFLAGS "${optCFLAGS} -finline-functions ")
105 # Do not leak the current directory into the binaries
106 if(CMAKE_COMPILER_IS_GNUCC AND NOT enable_coverage)
107 execute_process(COMMAND realpath --relative-to=${CMAKE_BINARY_DIR} ${CMAKE_SOURCE_DIR}
108 RESULT_VARIABLE RESULT OUTPUT_VARIABLE RELATIVE_SOURCE_DIR ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
110 message(STATUS "Relative source directory is \"${RELATIVE_SOURCE_DIR}\".")
112 message(WARNING "Failed to find relative source directory. Using \".\".")
113 set(RELATIVE_SOURCE_DIR ".")
115 if (CMAKE_C_COMPILER_VERSION VERSION_LESS "8.0")
116 set(optCFLAGS "${optCFLAGS} -fdebug-prefix-map=\"${CMAKE_SOURCE_DIR}=${RELATIVE_SOURCE_DIR}\"")
118 set(optCFLAGS "${optCFLAGS} -ffile-prefix-map=\"${CMAKE_SOURCE_DIR}=${RELATIVE_SOURCE_DIR}\"")
123 if(enable_lto) # User wants LTO. Try if we can do that
125 if(enable_compile_optimizations
126 AND (NOT enable_model-checking))
127 if(CMAKE_VERSION VERSION_LESS "3.9")
128 if ( CMAKE_COMPILER_IS_GNUCC
129 AND (CMAKE_C_COMPILER_VERSION VERSION_GREATER "4.8.5")
130 AND (LINKER_VERSION VERSION_GREATER "2.22"))
134 include(CheckIPOSupported)
135 check_ipo_supported(RESULT ipo LANGUAGES C CXX)
143 message(STATUS "LTO seems usable.")
145 if(NOT enable_compile_optimizations)
146 message(STATUS "LTO disabled: Compile-time optimizations turned off.")
148 if(enable_model-checking)
149 message(STATUS "LTO disabled when compiling with model-checking.")
151 message(STATUS "LTO does not seem usable -- try updating your build chain.")
156 message(STATUS "LTO disabled on the command line.")
158 if(enable_lto) # User wants LTO, and it seems usable. Go for it
159 set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
160 if(LTO_EXTRA_FLAG AND CMAKE_COMPILER_IS_GNUCC)
161 list(APPEND CMAKE_C_COMPILE_OPTIONS_IPO "-flto=${LTO_EXTRA_FLAG}")
162 list(APPEND CMAKE_CXX_COMPILE_OPTIONS_IPO "-flto=${LTO_EXTRA_FLAG}")
165 # Activate fat-lto-objects in case LD and gfortran differ too much.
166 # Only test with GNU as it's the only case I know (clang+gfortran+lld)
167 execute_process(COMMAND ${CMAKE_LINKER} -v OUTPUT_VARIABLE LINKER_ID ERROR_VARIABLE LINKER_ID)
168 string(REGEX MATCH "GNU" LINKER_ID "${LINKER_ID}")
169 if(${CMAKE_Fortran_COMPILER_ID} MATCHES "GNU"
170 AND NOT "${LINKER_ID}" MATCHES "GNU")
171 list(APPEND CMAKE_Fortran_COMPILE_OPTIONS_IPO "-ffat-lto-objects")
174 # "Since version 4.9 gcc produces slim object files that only contain
175 # the intermediate representation. In order to handle archives of
176 # these objects you have to use the gcc wrappers:
177 # gcc-ar, gcc-nm and gcc-ranlib."
178 if(${CMAKE_C_COMPILER_ID} STREQUAL "GNU"
179 AND CMAKE_C_COMPILER_VERSION VERSION_GREATER "4.8")
180 set (CMAKE_AR gcc-ar)
181 set (CMAKE_RANLIB gcc-ranlib)
185 if(enable_model-checking AND enable_compile_optimizations)
186 # Forget it, do not optimize the code (because it confuses the MC):
188 # But you can still optimize this:
189 set(src_list ${simgrid_sources})
191 list(REMOVE_ITEM src_list ${SIMIX_SRC} ${S4U_SRC})
194 src/kernel/actor/Simcall.cpp)
195 foreach(src ${src_list})
196 set (mcCFLAGS "-O3 -funroll-loops -fno-strict-aliasing")
197 if(CMAKE_COMPILER_IS_GNUCC)
198 set (mcCFLAGS "${mcCFLAGS} -finline-functions")
200 set_source_files_properties(${src} PROPERTIES COMPILE_FLAGS ${mcCFLAGS})
204 if (CMAKE_C_COMPILER_ID MATCHES "Intel")
205 # honor parentheses when determining the order of expression evaluation.
206 # disallow optimizations for floating-point arithmetic with Nans or +-Infs (breaks Eigen3)
207 set(optCFLAGS "${optCFLAGS} -fprotect-parens -fno-finite-math-only")
211 set(CMAKE_C_FLAGS "-DNDEBUG ${CMAKE_C_FLAGS}")
212 set(CMAKE_CXX_FLAGS "-DNDEBUG ${CMAKE_CXX_FLAGS}")
215 set(CMAKE_C_FLAGS "${warnCFLAGS} ${CMAKE_C_FLAGS} ${optCFLAGS}")
216 set(CMAKE_CXX_FLAGS "${warnCXXFLAGS} ${CMAKE_CXX_FLAGS} ${optCFLAGS}")
218 # Try to make Mac a bit more compliant to open source standards
219 if(CMAKE_SYSTEM_NAME MATCHES "Darwin")
220 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_XOPEN_SOURCE=700 -D_DARWIN_C_SOURCE")
223 # Avoid a failure seen with gcc 7.2.0 and ns3 3.27
225 set_source_files_properties(src/surf/network_ns3.cpp PROPERTIES COMPILE_FLAGS " -Wno-unused-local-typedef")
230 find_program(GCOV_PATH NAMES ENV{GCOV} gcov)
232 set(COVERAGE_COMMAND "${GCOV_PATH}" CACHE FILEPATH "Coverage testing tool (gcov)" FORCE)
233 set(COVERAGE_BUILD_FLAGS "-fprofile-arcs -ftest-coverage -fprofile-abs-path")
234 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DCOVERAGE ${COVERAGE_BUILD_FLAGS}")
235 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${COVERAGE_BUILD_FLAGS}")
236 set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${COVERAGE_BUILD_FLAGS}")
237 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DCOVERAGE ${COVERAGE_BUILD_FLAGS}")
238 add_definitions(${COVERAGE_BUILD_FLAGS})
242 if(enable_address_sanitizer)
243 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=address -fno-omit-frame-pointer")
244 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address -fno-omit-frame-pointer")
245 set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -fsanitize=address")
246 set(TESH_OPTION --enable-sanitizers)
247 try_compile(HAVE_SANITIZER_ADDRESS ${CMAKE_BINARY_DIR} ${CMAKE_HOME_DIRECTORY}/tools/cmake/test_prog/prog_asan.cpp)
248 try_compile(HAVE_SANITIZER_ADDRESS_FIBER_SUPPORT ${CMAKE_BINARY_DIR} ${CMAKE_HOME_DIRECTORY}/tools/cmake/test_prog/prog_asan.cpp
249 COMPILE_DEFINITIONS -DCHECK_FIBER_SUPPORT)
251 set(HAVE_SANITIZER_ADDRESS FALSE CACHE INTERNAL "")
252 set(HAVE_SANITIZER_ADDRESS_FIBER_SUPPORT FALSE CACHE INTERNAL "")
255 if(enable_thread_sanitizer)
256 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=thread -fno-omit-frame-pointer -no-pie")
257 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=thread -fno-omit-frame-pointer -no-pie")
258 if(CMAKE_COMPILER_IS_GNUCXX AND (NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "12.0")))
259 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-error=tsan")
261 set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -fsanitize=thread -no-pie")
262 try_compile(HAVE_SANITIZER_THREAD ${CMAKE_BINARY_DIR} ${CMAKE_HOME_DIRECTORY}/tools/cmake/test_prog/prog_tsan.cpp)
263 try_compile(HAVE_SANITIZER_THREAD_FIBER_SUPPORT ${CMAKE_BINARY_DIR} ${CMAKE_HOME_DIRECTORY}/tools/cmake/test_prog/prog_tsan.cpp
264 COMPILE_DEFINITIONS -DCHECK_FIBER_SUPPORT)
266 set(HAVE_SANITIZER_THREAD FALSE CACHE INTERNAL "")
267 set(HAVE_SANITIZER_THREAD_FIBER_SUPPORT FALSE CACHE INTERNAL "")
270 if(enable_undefined_sanitizer)
271 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=undefined -fno-omit-frame-pointer")
272 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=undefined -fno-omit-frame-pointer")
273 set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -fsanitize=undefined")
276 if(NOT $ENV{CFLAGS} STREQUAL "")
277 message(STATUS "Add CFLAGS: \"$ENV{CFLAGS}\" to CMAKE_C_FLAGS")
278 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} $ENV{CFLAGS}")
281 if(NOT $ENV{CXXFLAGS} STREQUAL "")
282 message(STATUS "Add CXXFLAGS: \"$ENV{CXXFLAGS}\" to CMAKE_CXX_FLAGS")
283 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} $ENV{CXXFLAGS}")
286 if(NOT $ENV{LDFLAGS} STREQUAL "")
287 message(STATUS "Add LDFLAGS: \"$ENV{LDFLAGS}\" to CMAKE_C_LINK_FLAGS")
288 set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} $ENV{LDFLAGS}")