compiler.cmake
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include(CheckCXXCompilerFlag)
set(PLATFORM_RELEASE "")
function(platformRelease)
set(PR, "")
execute_process(COMMAND /bin/bash -c "if [ -e /etc/redhat-release ]; then cat /etc/redhat-release | tr -d '\n'; fi" OUTPUT_VARIABLE PR)
message(STATUS "Platform is ${PR}")
set(PLATFORM_RELEASE "${PR}" PARENT_SCOPE)
endfunction(platformRelease)
# The target architecture (-march, -mtune) is assumed to be the architecture that was used to build gcc.
# If cross-compilation is required, this should be specified as cmake arguments.
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic -Wshadow" )
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wnon-virtual-dtor -Woverloaded-virtual -Winit-self -Wuninitialized -Wunused -Wcast-qual" )
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-long-long" )
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wold-style-cast" )
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror=return-type" )
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^x86_64")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-noexcept-type" )
endif()
if(CMAKE_COMPILER_IS_GNUCC
AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9
AND NOT APPLE)
# Mac OSX doesn't seem to honour -isystem, so not for Mac.
# Also, GCC 4.8 complains about boost
MESSAGE(STATUS "Don't treat warnings as errors")
else()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror" )
endif()
if(BUILD_WITH_PROFILING)
message(STATUS "Profiling enabled")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pg" )
else()
message(STATUS "Profiling disabled")
endif()
# Allow linking into a dynamic library
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC" )
# Use RelWithDebInfo as default build type
if (NOT CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE "RelWithDebInfo")
endif()
message(STATUS "CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
if(CMAKE_BUILD_TYPE STREQUAL "Release" OR CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
set(NOASSERTS 1) # Disable asserts as well
# -O3 causes weird crashes on win32 so we force -O2 for release builds also for linux builds
string(REGEX REPLACE "-O3" "-O2" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
string(REGEX REPLACE "-O3" "-O2" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
if(MINGW)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s")
endif()
else()
# Let Qt track the use of QSharedPointer
set(CMAKE_CXX_CFLAGS "${CMAKE_CXX_FLAGS} -DQT_SHAREDPOINTER_TRACK_POINTERS")
# If we're debugging, remove -O2 completely
string(REGEX REPLACE "-O2" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
string(REGEX REPLACE "-O2" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
string(REGEX REPLACE "-O2" "" CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
string(REGEX REPLACE "-O2" "" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
endif()
# Disable asserts with -DNOASSERTS=1 as a CMake command-line parameter
if(NOASSERTS)
add_definitions(-DQT_NO_DEBUG)
add_definitions(-DNDEBUG)
message(STATUS "Asserts have been disabled")
endif(NOASSERTS)
if(APPLE)
# AVX instructions currently cause assembler errors, so disabling them
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -w -mno-avx -mmacosx-version-min=10.7 -stdlib=libc++ ")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -w -mno-avx -mmacosx-version-min=10.7")
endif(APPLE)
if(UNIX)
if(BUILD_WITH_COVERAGE)
# Specifically enable coverate info, since ccache can't cache with
# profiling enabled, seriously hurting build-times in Debug-mode
message(STATUS "Generate coverage info")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fprofile-arcs -ftest-coverage")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fprofile-arcs -ftest-coverage")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fprofile-arcs -ftest-coverage")
if (NOT TARGET RemoveGCDA)
add_custom_target(RemoveGCDA ALL
COMMAND find . -name "*.gcda" -delete
COMMENT "Removing gcda files")
endif(NOT TARGET RemoveGCDA)
if(NOT NOASSERTS)
add_definitions(-DQT_SHAREDPOINTER_TRACK_POINTERS)
endif(NOT NOASSERTS)
else()
message(STATUS "Building without coverage info")
endif()
endif(UNIX)
if(UNIX AND NOT APPLE)
# needed for making qwt happy
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lrt" )
endif(UNIX AND NOT APPLE)
if(MINGW)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mwindows" )
endif(MINGW)
CHECK_CXX_COMPILER_FLAG( -fstack-protector-all result )
if(result)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fstack-protector-all")
endif(result)
CHECK_CXX_COMPILER_FLAG( -fthreadsafe-statics THREADSAFE_RESULT)
if( NOT THREADSAFE_RESULT)
message(FATAL_ERROR, "Compiler does not support threadsafe statics variables in methods")
endif()
# We use static variables in method scope, they must be threadsafe, this is on by default since gcc 4 but this flag is a check
# If the compiler does not support this then build will fail.
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fthreadsafe-statics")
if(CMAKE_COMPILER_IS_GNUCXX)
# Check on which architecture we are. ARM doesn't support mfpmath
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^x86_64")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfpmath=sse" )
endif()
MESSAGE(STATUS "Checking the c++ Standard supported by the compiler" )
# Check which version of c++ we can use. We drill down from c++17 to c96
CHECK_CXX_COMPILER_FLAG( -std=c++17 cxxresult )
if( NOT cxxresult )
CHECK_CXX_COMPILER_FLAG( -std=c++14 cxxresult )
if( NOT cxxresult )
CHECK_CXX_COMPILER_FLAG( -std=c++11 cxxresult )
if( NOT cxxresult )
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
else()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
endif()
else()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
endif()
else()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
endif()
MESSAGE(STATUS "Compiling for ${CMAKE_CXX_FLAGS}")
# -Wzero-as-null-pointer-constant is disabled for now, since the Qt 4.8.4
# macro's produce a bucketload of these warnings. Might be useful later on.
# CHECK_CXX_COMPILER_FLAG( -Wzero-as-null-pointer-constant cxxresult )
# if(cxxresult)
# set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wzero-as-null-pointer-constant")
# endif(cxxresult)
# Leave out deprecation warnings, mostly generated by CppUnit
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-deprecated-declarations")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Weffc++")
endif(CMAKE_COMPILER_IS_GNUCXX)
if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
MESSAGE(STATUS "Enabling Clang flags")
# We enable all warnings and disable what we don't need
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Weverything")
# Warns if items need to be re-aligned to 4-byte boundaries. Since we use
# booleans in our code, these warnings are all over the place. If
# memory-usage becomes an issue, we can pack all booleans together using
# this warning. However, it's currently not practical to eliminate them all.
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-padded")
# We use a lot of static objects, which get cleaned up at exit by their destructors.
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-exit-time-destructors")
# Static objects tend to have global constructors
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-global-constructors")
# We mix int / unsigned int a lot, so disabled it for the moment
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-sign-conversion")
# Warning caused by the Qt translations
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-missing-prototypes")
# We standardize on C++11, so don't bother us with C++98
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-c++98-compat -Wno-c++98-compat-pedantic")
# We explicitly want to use the switch(){default: break;} construction
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-switch-enum")
# Q_OBJECT does an "int i = i;"...
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-self-assign")
# Compile for C++11
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
# Don't complain about unused arguments, since this also triggers warnings
# about include-directories that are unused...
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Qunused-arguments")
# Don't complain about fall-throughs in switch/case statements
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-implicit-fallthrough")
# Since "Q_ASSERT(false)" creates a not of noise, disable it when asserts are active
if(NOT NOASSERTS)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unreachable-code")
endif(NOT NOASSERTS)
# There is no way to avoid this warning right now, so we disable it
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-weak-template-vtables")
# Warning caused by Qt resource files, so disabling it
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-missing-variable-declarations")
# WORKAROUND: Somehow Qt forgets that Clang is a C++11 compiler
ADD_DEFINITIONS("-DQ_COMPILER_INITIALIZER_LISTS")
# Clang 3.3 doesn't know Doxygens' "\test" and "\retval" tags, so disabling
# check for unknown tags for now
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-documentation-unknown-command")
if(CMAKE_CXX_COMPILER_VERSION MATCHES "3\\.4\\.2")
message(STATUS "compiler is clang version 3.4.2")
platformRelease()
if("${PLATFORM_RELEASE}" MATCHES "CentOS Linux release 7\\.2\\..+")
# Override the gnu minor version only for this specific combination of platform and clang version
set(CMAKE_CXX_FLAGS "-U__GNUC_MINOR__ -D__GNUC_MINOR__=3 ${CMAKE_CXX_FLAGS}")
message(STATUS "Overriding clang gnu minor version to 3 so that several libstd c++11 features like tuple can be used")
endif("${PLATFORM_RELEASE}" MATCHES "CentOS Linux release 7\\.2\\..+")
endif(CMAKE_CXX_COMPILER_VERSION MATCHES "3\\.4\\.2")
endif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
if(APPLE)
set(WHOLE_ARCHIVE_ON "-all_load")
set(WHOLE_ARCHIVE_OFF "")
else()
set(WHOLE_ARCHIVE_ON "-Wl,-whole-archive")
set(WHOLE_ARCHIVE_OFF "-Wl,-no-whole-archive")
endif()