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 -Wunused -Wmissing-declarations -Wpointer-arith -Wwrite-strings -Wno-unused-function -Wno-unused-parameter -Wno-strict-aliasing")
18 if(CMAKE_COMPILER_IS_GNUCC)
19 set(warnCFLAGS "${warnCFLAGS} -Wclobbered -Wformat-signedness -Wno-error=clobbered -Wno-unused-local-typedefs -Wno-error=attributes -Wno-error=maybe-uninitialized")
21 if (CMAKE_CXX_COMPILER_ID MATCHES "Intel")
23 # 191: type qualifier is meaningless on cast type
24 # 1418: external function definition with no prior declaration
25 # 2196: routine is both "inline" and "noinline"
26 # 2651: attribute does not apply to any entity
27 # 3179: deprecated conversion of string literal to char* (should be const char*)
29 # 597: entity-kind "entity" will not be called for implicit or explicit conversions
30 # 2330: argument of type "type" is incompatible with parameter of type "type" (dropping qualifiers)
31 # 11003: no IR in object file xxxx; was the source file compiled with xxxx
32 set(warnCFLAGS "${warnCFLAGS} -diag-disable=191,1418,2196,2651,3179 -diag-warning=597,2330,11003")
35 set(warnCXXFLAGS "${warnCFLAGS} -Wall -Wextra -Wunused -Wmissing-declarations -Wpointer-arith -Wwrite-strings -Wno-unused-function -Wno-unused-parameter -Wno-strict-aliasing")
36 if(CMAKE_COMPILER_IS_GNUCXX)
37 set(warnCXXFLAGS "${warnCXXFLAGS} -Wclobbered -Wformat-signedness -Wno-error=clobbered -Wno-free-nonheap-object -Wno-unused-local-typedefs -Wno-error=attributes -Wno-error=maybe-uninitialized")
39 if(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "8.0")
40 # workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81767
41 set(warnCXXFLAGS "${warnCXXFLAGS} -Wno-error=unused-variable")
43 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
44 # don't care about class that become struct, avoid issue of empty C structs
45 # size (coming from libunwind.h)
46 set(warnCXXFLAGS "${warnCXXFLAGS} -Wno-mismatched-tags -Wno-extern-c-compat")
49 # the one specific to C but refused by C++
50 set(warnCFLAGS "${warnCFLAGS} -Wmissing-prototypes")
52 if(CMAKE_Fortran_COMPILER_ID MATCHES "GCC|PGI")
53 set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -Wall")
54 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "Flang")
55 # flang >= 7 has a bug with common and debug flags. Ignore cmake-added -g in this case.
56 # https://github.com/flang-compiler/flang/issues/671
57 set(CMAKE_Fortran_FLAGS "-Wall")
58 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "Intel")
59 set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -warn all")
61 set(CMAKE_JAVA_COMPILE_FLAGS "-Xlint")
64 # NDEBUG gives a lot of "initialized but unused variables" errors. Don't die anyway.
65 if(enable_compile_warnings AND enable_debug)
66 set(warnCFLAGS "${warnCFLAGS} -Werror")
67 set(warnCXXFLAGS "${warnCXXFLAGS} -Werror")
68 if(CMAKE_Fortran_COMPILER_ID MATCHES "GCC")
69 set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -Werror -Werror=format-security")
73 # Activate the warnings on #if FOOBAR when FOOBAR has no value
74 # It breaks on FreeBSD within Boost headers, so activate this only in Pure Hardcore debug mode.
75 if(enable_maintainer_mode)
76 set(warnCFLAGS "${warnCFLAGS} -Wundef")
77 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wundef")
80 # Se the optimisation flags
81 # NOTE, we should CMAKE_BUILD_TYPE for this
82 if(enable_compile_optimizations)
83 set(optCFLAGS "-O3 -funroll-loops -fno-strict-aliasing ")
87 if(enable_compile_optimizations AND CMAKE_COMPILER_IS_GNUCC
88 AND (NOT enable_model-checking))
89 # This is redundant (already in -03):
90 set(optCFLAGS "${optCFLAGS} -finline-functions ")
93 # Do not leak the current directory into the binaries
94 if(CMAKE_COMPILER_IS_GNUCC)
95 execute_process(COMMAND realpath --relative-to=${CMAKE_BINARY_DIR} ${CMAKE_SOURCE_DIR}
96 RESULT_VARIABLE RESULT OUTPUT_VARIABLE RELATIVE_SOURCE_DIR ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
98 message(STATUS "Relative source directory is \"${RELATIVE_SOURCE_DIR}\".")
100 message(WARNING "Failed to find relative source directory. Using \".\".")
101 set(RELATIVE_SOURCE_DIR ".")
103 if (CMAKE_C_COMPILER_VERSION VERSION_LESS "8.0")
104 set(optCFLAGS "${optCFLAGS} -fdebug-prefix-map=\"${CMAKE_SOURCE_DIR}=${RELATIVE_SOURCE_DIR}\"")
106 set(optCFLAGS "${optCFLAGS} -ffile-prefix-map=\"${CMAKE_SOURCE_DIR}=${RELATIVE_SOURCE_DIR}\"")
111 if(enable_lto) # User wants LTO. Try if we can do that
113 if(enable_compile_optimizations
114 AND (NOT enable_model-checking))
115 if(CMAKE_VERSION VERSION_LESS "3.9")
116 if ( CMAKE_COMPILER_IS_GNUCC
117 AND (CMAKE_C_COMPILER_VERSION VERSION_GREATER "4.8.5")
118 AND (LINKER_VERSION VERSION_GREATER "2.22"))
122 include(CheckIPOSupported)
123 check_ipo_supported(RESULT ipo LANGUAGES C CXX)
131 message(STATUS "LTO seems usable.")
133 if(NOT enable_compile_optimizations)
134 message(STATUS "LTO disabled: Compile-time optimizations turned off.")
136 if(enable_model-checking)
137 message(STATUS "LTO disabled when compiling with model-checking.")
139 message(STATUS "LTO does not seem usable -- try updating your build chain.")
144 message(STATUS "LTO disabled on the command line.")
146 if(enable_lto) # User wants LTO, and it seems usable. Go for it
147 set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
148 if(LTO_EXTRA_FLAG AND CMAKE_COMPILER_IS_GNUCC)
149 list(APPEND CMAKE_C_COMPILE_OPTIONS_IPO "-flto=${LTO_EXTRA_FLAG}")
150 list(APPEND CMAKE_CXX_COMPILE_OPTIONS_IPO "-flto=${LTO_EXTRA_FLAG}")
153 # Activate fat-lto-objects in case LD and gfortran differ too much.
154 # Only test with GNU as it's the only case I know (clang+gfortran+lld)
155 execute_process(COMMAND ${CMAKE_LINKER} -v OUTPUT_VARIABLE LINKER_ID ERROR_VARIABLE LINKER_ID)
156 string(REGEX MATCH "GNU" LINKER_ID "${LINKER_ID}")
157 if(${CMAKE_Fortran_COMPILER_ID} MATCHES "GNU"
158 AND NOT "${LINKER_ID}" MATCHES "GNU")
159 list(APPEND CMAKE_Fortran_COMPILE_OPTIONS_IPO "-ffat-lto-objects")
162 # "Since version 4.9 gcc produces slim object files that only contain
163 # the intermediate representation. In order to handle archives of
164 # these objects you have to use the gcc wrappers:
165 # gcc-ar, gcc-nm and gcc-ranlib."
166 if(${CMAKE_C_COMPILER_ID} STREQUAL "GNU"
167 AND CMAKE_C_COMPILER_VERSION VERSION_GREATER "4.8")
168 set (CMAKE_AR gcc-ar)
169 set (CMAKE_RANLIB gcc-ranlib)
173 if(enable_model-checking AND enable_compile_optimizations)
174 # Forget it, do not optimize the code (because it confuses the MC):
176 # But you can still optimize this:
177 set(src_list ${simgrid_sources})
179 list(REMOVE_ITEM src_list ${SIMIX_SRC} ${S4U_SRC})
182 src/kernel/actor/Simcall.cpp)
183 foreach(src ${src_list})
184 set (mcCFLAGS "-O3 -funroll-loops -fno-strict-aliasing")
185 if(CMAKE_COMPILER_IS_GNUCC)
186 set (mcCFLAGS "${mcCFLAGS} -finline-functions")
188 set_source_files_properties(${src} PROPERTIES COMPILE_FLAGS ${mcCFLAGS})
192 if (CMAKE_C_COMPILER_ID MATCHES "Intel")
193 # honor parentheses when determining the order of expression evaluation.
194 # disallow optimizations for floating-point arithmetic with Nans or +-Infs (breaks Eigen3)
195 set(optCFLAGS "${optCFLAGS} -fprotect-parens -fno-finite-math-only")
199 set(CMAKE_C_FLAGS "-DNDEBUG ${CMAKE_C_FLAGS}")
200 set(CMAKE_CXX_FLAGS "-DNDEBUG ${CMAKE_CXX_FLAGS}")
203 set(CMAKE_C_FLAGS "${warnCFLAGS} ${CMAKE_C_FLAGS} ${optCFLAGS}")
204 set(CMAKE_CXX_FLAGS "${warnCXXFLAGS} ${CMAKE_CXX_FLAGS} ${optCFLAGS}")
206 # Try to make Mac a bit more compliant to open source standards
207 if(CMAKE_SYSTEM_NAME MATCHES "Darwin")
208 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_XOPEN_SOURCE=700 -D_DARWIN_C_SOURCE")
211 # Avoid a failure seen with gcc 7.2.0 and ns3 3.27
213 set_source_files_properties(src/surf/network_ns3.cpp PROPERTIES COMPILE_FLAGS " -Wno-unused-local-typedef")
218 find_program(GCOV_PATH NAMES ENV{GCOV} gcov)
220 set(COVERAGE_COMMAND "${GCOV_PATH}" CACHE FILEPATH "Coverage testing tool (gcov)" FORCE)
221 set(COVERAGE_BUILD_FLAGS "-fprofile-arcs -ftest-coverage -fprofile-abs-path")
222 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DCOVERAGE ${COVERAGE_BUILD_FLAGS}")
223 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${COVERAGE_BUILD_FLAGS}")
224 set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${COVERAGE_BUILD_FLAGS}")
225 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DCOVERAGE ${COVERAGE_BUILD_FLAGS}")
226 add_definitions(${COVERAGE_BUILD_FLAGS})
230 if(enable_address_sanitizer)
231 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=address -fno-omit-frame-pointer")
232 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address -fno-omit-frame-pointer")
233 set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -fsanitize=address")
234 set(TESH_OPTION --enable-sanitizers)
235 try_compile(HAVE_SANITIZER_ADDRESS ${CMAKE_BINARY_DIR} ${CMAKE_HOME_DIRECTORY}/tools/cmake/test_prog/prog_asan.cpp)
236 try_compile(HAVE_SANITIZER_ADDRESS_FIBER_SUPPORT ${CMAKE_BINARY_DIR} ${CMAKE_HOME_DIRECTORY}/tools/cmake/test_prog/prog_asan.cpp
237 COMPILE_DEFINITIONS -DCHECK_FIBER_SUPPORT)
239 set(HAVE_SANITIZER_ADDRESS FALSE CACHE INTERNAL "")
240 set(HAVE_SANITIZER_ADDRESS_FIBER_SUPPORT FALSE CACHE INTERNAL "")
243 if(enable_thread_sanitizer)
244 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=thread -fno-omit-frame-pointer -no-pie")
245 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=thread -fno-omit-frame-pointer -no-pie")
246 if(CMAKE_COMPILER_IS_GNUCXX AND (NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "12.0")))
247 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-error=tsan")
249 set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -fsanitize=thread -no-pie")
250 try_compile(HAVE_SANITIZER_THREAD ${CMAKE_BINARY_DIR} ${CMAKE_HOME_DIRECTORY}/tools/cmake/test_prog/prog_tsan.cpp)
251 try_compile(HAVE_SANITIZER_THREAD_FIBER_SUPPORT ${CMAKE_BINARY_DIR} ${CMAKE_HOME_DIRECTORY}/tools/cmake/test_prog/prog_tsan.cpp
252 COMPILE_DEFINITIONS -DCHECK_FIBER_SUPPORT)
254 set(HAVE_SANITIZER_THREAD FALSE CACHE INTERNAL "")
255 set(HAVE_SANITIZER_THREAD_FIBER_SUPPORT FALSE CACHE INTERNAL "")
258 if(enable_undefined_sanitizer)
259 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=undefined -fno-omit-frame-pointer")
260 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=undefined -fno-omit-frame-pointer")
261 set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -fsanitize=undefined")
264 if(NOT $ENV{CFLAGS} STREQUAL "")
265 message(STATUS "Add CFLAGS: \"$ENV{CFLAGS}\" to CMAKE_C_FLAGS")
266 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} $ENV{CFLAGS}")
269 if(NOT $ENV{CXXFLAGS} STREQUAL "")
270 message(STATUS "Add CXXFLAGS: \"$ENV{CXXFLAGS}\" to CMAKE_CXX_FLAGS")
271 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} $ENV{CXXFLAGS}")
274 if(NOT $ENV{LDFLAGS} STREQUAL "")
275 message(STATUS "Add LDFLAGS: \"$ENV{LDFLAGS}\" to CMAKE_C_LINK_FLAGS")
276 set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} $ENV{LDFLAGS}")
280 # http://stackoverflow.com/questions/10452262/create-64-bit-jni-under-windows
281 # We don't want to ship libgcc_s_seh-1.dll nor libstdc++-6.dll
282 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -static-libgcc")
283 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static-libgcc -static-libstdc++")
284 set(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "${CMAKE_SHARED_LIBRARY_LINK_C_FLAGS} -static-libgcc")
285 set(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "${CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS} -static-libgcc -static-libstdc++")
287 # JNI searches for stdcalls
288 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wl,--add-stdcall-alias")
289 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wl,--add-stdcall-alias")
290 set(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "${CMAKE_SHARED_LIBRARY_LINK_C_FLAGS} -Wl,--add-stdcall-alias")
291 set(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "${CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS} -Wl,--add-stdcall-alias")
293 # Specify the data model that we are using (yeah it may help Java)
294 if(CMAKE_SIZEOF_VOID_P EQUAL 4) # 32 bits
295 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32")
296 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32")
298 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m64")
299 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m64")