2 ## This file is in charge of setting our paranoid flags with regard to warnings and optimization.
4 ## It is only used for gcc, clang and Intel compilers.
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-local-typedefs -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 "${warnCFLAGS} -Wclobbered -Wformat-signedness -Wno-error=clobbered -Wno-error=attributes -Wno-error=maybe-uninitialized")
38 if(CMAKE_COMPILER_IS_GNUCXX)
39 set(warnCXXFLAGS "${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 "${warnCXXFLAGS} -Wno-error=unused-variable")
44 if (CMAKE_CXX_COMPILER_VERSION VERSION_EQUAL "13.2.0")
45 # workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101361
46 set(warnCXXFLAGS "${warnCXXFLAGS} -Wno-error=stringop-overread -Wno-error=stringop-overflow")
50 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
51 # don't care about class that become struct, avoid issue of empty C structs
52 # size (coming from libunwind.h)
53 set(warnCXXFLAGS "${warnCXXFLAGS} -Wno-mismatched-tags -Wno-extern-c-compat")
54 # also ignore deprecated builtins (seen with clang 15 + boost 1.79)
55 if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "15.0")
56 set(warnCXXFLAGS "${warnCXXFLAGS} -Wno-deprecated-builtins")
60 # the one specific to C but refused by C++
61 set(warnCFLAGS "${warnCFLAGS} -Wmissing-prototypes")
63 if(CMAKE_Fortran_COMPILER_ID MATCHES "GCC|PGI")
64 set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -Wall")
65 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "Flang")
66 # flang >= 7 has a bug with common and debug flags. Ignore cmake-added -g in this case.
67 # https://github.com/flang-compiler/flang/issues/671
68 set(CMAKE_Fortran_FLAGS "-Wall")
69 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "Intel")
70 set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -warn all")
74 # NDEBUG gives a lot of "initialized but unused variables" errors. Don't die anyway.
75 if(enable_compile_warnings AND enable_debug)
76 set(warnCFLAGS "${warnCFLAGS} -Werror")
77 set(warnCXXFLAGS "${warnCXXFLAGS} -Werror")
78 if(CMAKE_Fortran_COMPILER_ID MATCHES "GCC")
79 set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -Werror -Werror=format-security")
83 # Activate the warnings on #if FOOBAR when FOOBAR has no value
84 if("${CMAKE_SYSTEM}" MATCHES "Linux") # Breaks on FreeBSD within Boost headers :(
85 set(warnCFLAGS "${warnCFLAGS} -Wundef")
86 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wundef")
89 # Set the optimisation flags
90 # NOTE, we should CMAKE_BUILD_TYPE for this
91 if(enable_compile_optimizations)
92 set(optCFLAGS "-O3 -funroll-loops -fno-strict-aliasing ")
97 # ARM platforms have signed char by default, switch to unsigned for consistancy
98 if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "aarch64")
99 set(optCFLAGS "${optCFLAGS} -fsigned-char")
102 if(enable_compile_optimizations AND CMAKE_COMPILER_IS_GNUCC)
103 # This is redundant (already in -03):
104 set(optCFLAGS "${optCFLAGS} -finline-functions ")
107 # Do not leak the current directory into the binaries
108 if(CMAKE_COMPILER_IS_GNUCC AND NOT enable_coverage)
109 if (CMAKE_VERSION VERSION_LESS "3.20")
110 file(RELATIVE_PATH RELATIVE_SOURCE_DIR ${CMAKE_BINARY_DIR} ${CMAKE_SOURCE_DIR})
111 else() # cmake >= 3.20
112 cmake_path(RELATIVE_PATH CMAKE_SOURCE_DIR BASE_DIRECTORY ${CMAKE_BINARY_DIR} OUTPUT_VARIABLE RELATIVE_SOURCE_DIR)
114 message(STATUS "Relative source directory is \"${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 include(CheckIPOSupported)
127 check_ipo_supported(RESULT ipo LANGUAGES C CXX)
134 message(STATUS "LTO seems usable.")
136 if(NOT enable_compile_optimizations)
137 message(STATUS "LTO disabled: Compile-time optimizations turned off.")
139 message(STATUS "LTO does not seem usable -- try updating your build chain.")
143 message(STATUS "LTO disabled on the command line.")
145 if(enable_lto) # User wants LTO, and it seems usable. Go for it
146 set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
147 if(LTO_EXTRA_FLAG AND CMAKE_COMPILER_IS_GNUCC)
148 list(APPEND CMAKE_C_COMPILE_OPTIONS_IPO "-flto=${LTO_EXTRA_FLAG}")
149 list(APPEND CMAKE_CXX_COMPILE_OPTIONS_IPO "-flto=${LTO_EXTRA_FLAG}")
152 # Activate fat-lto-objects in case LD and gfortran differ too much.
153 # Only test with GNU as it's the only case I know (clang+gfortran+lld)
154 execute_process(COMMAND ${CMAKE_LINKER} -v OUTPUT_VARIABLE LINKER_ID ERROR_VARIABLE LINKER_ID)
155 string(REGEX MATCH "GNU" LINKER_ID "${LINKER_ID}")
156 if(${CMAKE_Fortran_COMPILER_ID} MATCHES "GNU"
157 AND NOT "${LINKER_ID}" MATCHES "GNU")
158 list(APPEND CMAKE_Fortran_COMPILE_OPTIONS_IPO "-ffat-lto-objects")
161 # "Since version 4.9 gcc produces slim object files that only contain
162 # the intermediate representation. In order to handle archives of
163 # these objects you have to use the gcc wrappers:
164 # gcc-ar, gcc-nm and gcc-ranlib."
165 if(${CMAKE_C_COMPILER_ID} STREQUAL "GNU"
166 AND CMAKE_C_COMPILER_VERSION VERSION_GREATER "4.8")
167 set (CMAKE_AR gcc-ar)
168 set (CMAKE_RANLIB gcc-ranlib)
172 if (CMAKE_C_COMPILER_ID MATCHES "Intel")
173 # honor parentheses when determining the order of expression evaluation.
174 # disallow optimizations for floating-point arithmetic with Nans or +-Infs (breaks Eigen3)
175 set(optCFLAGS "${optCFLAGS} -fprotect-parens -fno-finite-math-only")
179 set(CMAKE_C_FLAGS "-DNDEBUG ${CMAKE_C_FLAGS}")
180 set(CMAKE_CXX_FLAGS "-DNDEBUG ${CMAKE_CXX_FLAGS}")
183 set(CMAKE_C_FLAGS "${warnCFLAGS} ${CMAKE_C_FLAGS} ${optCFLAGS}")
184 set(CMAKE_CXX_FLAGS "${warnCXXFLAGS} ${CMAKE_CXX_FLAGS} ${optCFLAGS}")
186 # Try to make Mac a bit more compliant to open source standards
187 if(CMAKE_SYSTEM_NAME MATCHES "Darwin")
188 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_XOPEN_SOURCE=700 -D_DARWIN_C_SOURCE")
193 find_program(GCOV_PATH NAMES ENV{GCOV} gcov)
195 set(COVERAGE_COMMAND "${GCOV_PATH}" CACHE FILEPATH "Coverage testing tool (gcov)" FORCE)
196 set(COVERAGE_BUILD_FLAGS "-fprofile-arcs -ftest-coverage -fprofile-abs-path")
197 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DCOVERAGE ${COVERAGE_BUILD_FLAGS}")
198 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${COVERAGE_BUILD_FLAGS}")
199 set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${COVERAGE_BUILD_FLAGS}")
200 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DCOVERAGE ${COVERAGE_BUILD_FLAGS}")
201 add_definitions(${COVERAGE_BUILD_FLAGS})
205 if(enable_address_sanitizer)
206 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=address -fno-omit-frame-pointer")
207 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address -fno-omit-frame-pointer")
208 set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -fsanitize=address")
209 set(TESH_OPTION --enable-sanitizers)
210 try_compile(HAVE_SANITIZER_ADDRESS ${CMAKE_BINARY_DIR} ${CMAKE_HOME_DIRECTORY}/tools/cmake/test_prog/prog_asan.cpp)
211 try_compile(HAVE_SANITIZER_ADDRESS_FIBER_SUPPORT ${CMAKE_BINARY_DIR} ${CMAKE_HOME_DIRECTORY}/tools/cmake/test_prog/prog_asan.cpp
212 COMPILE_DEFINITIONS -DCHECK_FIBER_SUPPORT)
214 set(HAVE_SANITIZER_ADDRESS FALSE CACHE INTERNAL "")
215 set(HAVE_SANITIZER_ADDRESS_FIBER_SUPPORT FALSE CACHE INTERNAL "")
218 if(enable_thread_sanitizer)
219 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=thread -fno-omit-frame-pointer -no-pie")
220 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=thread -fno-omit-frame-pointer -no-pie")
221 if(CMAKE_COMPILER_IS_GNUCXX AND (NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "12.0")))
222 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-error=tsan")
224 set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -fsanitize=thread -no-pie")
225 try_compile(HAVE_SANITIZER_THREAD ${CMAKE_BINARY_DIR} ${CMAKE_HOME_DIRECTORY}/tools/cmake/test_prog/prog_tsan.cpp)
226 try_compile(HAVE_SANITIZER_THREAD_FIBER_SUPPORT ${CMAKE_BINARY_DIR} ${CMAKE_HOME_DIRECTORY}/tools/cmake/test_prog/prog_tsan.cpp
227 COMPILE_DEFINITIONS -DCHECK_FIBER_SUPPORT)
229 set(HAVE_SANITIZER_THREAD FALSE CACHE INTERNAL "")
230 set(HAVE_SANITIZER_THREAD_FIBER_SUPPORT FALSE CACHE INTERNAL "")
233 if(enable_undefined_sanitizer)
234 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=undefined -fno-omit-frame-pointer")
235 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=undefined -fno-omit-frame-pointer")
236 set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -fsanitize=undefined")
239 if(NOT $ENV{CFLAGS} STREQUAL "")
240 message(STATUS "Add CFLAGS: \"$ENV{CFLAGS}\" to CMAKE_C_FLAGS")
241 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} $ENV{CFLAGS}")
244 if(NOT $ENV{CXXFLAGS} STREQUAL "")
245 message(STATUS "Add CXXFLAGS: \"$ENV{CXXFLAGS}\" to CMAKE_CXX_FLAGS")
246 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} $ENV{CXXFLAGS}")
249 if(NOT $ENV{LDFLAGS} STREQUAL "")
250 message(STATUS "Add LDFLAGS: \"$ENV{LDFLAGS}\" to CMAKE_C_LINK_FLAGS")
251 set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} $ENV{LDFLAGS}")