#------------------------------------------------------------------------------ # EthCompilerSettings.cmake # # CMake file for cpp-ethereum project which specifies our compiler settings # for each supported platform and build configuration. # # The documentation for cpp-ethereum is hosted at http://cpp-ethereum.org # # Copyright (c) 2014-2016 cpp-ethereum contributors. #------------------------------------------------------------------------------ # Clang seeks to be command-line compatible with GCC as much as possible, so # most of our compiler settings are common between GCC and Clang. # # These settings then end up spanning all POSIX platforms (Linux, OS X, BSD, etc) include(EthCheckCXXCompilerFlag) eth_add_cxx_compiler_flag_if_supported(-fstack-protector-strong have_stack_protector_strong_support) if(NOT have_stack_protector_strong_support) eth_add_cxx_compiler_flag_if_supported(-fstack-protector) endif() eth_add_cxx_compiler_flag_if_supported(-Wimplicit-fallthrough) if (("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")) # Enables all the warnings about constructions that some users consider questionable, # and that are easy to avoid. Also enable some extra warning flags that are not # enabled by -Wall. Finally, treat at warnings-as-errors, which forces developers # to fix warnings as they arise, so they don't accumulate "to be fixed later". add_compile_options(-Wall) add_compile_options(-Wextra) add_compile_options(-Werror) # Configuration-specific compiler settings. set(CMAKE_CXX_FLAGS_DEBUG "-O0 -g3 -DETH_DEBUG") set(CMAKE_CXX_FLAGS_MINSIZEREL "-Os -DNDEBUG") set(CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG") set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -g3") # Additional GCC-specific compiler settings. if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU") # Check that we've got GCC 4.7 or newer. execute_process( COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION) if (NOT (GCC_VERSION VERSION_GREATER 4.7 OR GCC_VERSION VERSION_EQUAL 4.7)) message(FATAL_ERROR "${PROJECT_NAME} requires g++ 4.7 or greater.") endif () # Additional Clang-specific compiler settings. elseif ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") if ("${CMAKE_SYSTEM_NAME}" MATCHES "Darwin") # Set stack size to 32MB - by default Apple's clang defines a stack size of 8MB. # Normally 16MB is enough to run all tests, but it will exceed the stack, if -DSANITIZE=address is used. set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-stack_size -Wl,0x2000000") # Boost libraries use visibility=hidden to reduce unnecessary DWARF entries. # Unless we match visibility, ld will give a warning message like: # ld: warning: direct access in function 'boost::filesystem... from file ... # means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings. set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden") endif() # Some Linux-specific Clang settings. We don't want these for OS X. if ("${CMAKE_SYSTEM_NAME}" MATCHES "Linux") # TODO - Is this even necessary? Why? # See http://stackoverflow.com/questions/19774778/when-is-it-necessary-to-use-use-the-flag-stdlib-libstdc. add_compile_options(-stdlib=libstdc++) # Tell Boost that we're using Clang's libc++. Not sure exactly why we need to do. add_definitions(-DBOOST_ASIO_HAS_CLANG_LIBCXX) # Use fancy colors in the compiler diagnostics add_compile_options(-fcolor-diagnostics) # See "How to silence unused command line argument error with clang without disabling it?" # When using -Werror with clang, it transforms "warning: argument unused during compilation" messages # into errors, which makes sense. # http://stackoverflow.com/questions/21617158/how-to-silence-unused-command-line-argument-error-with-clang-without-disabling-i add_compile_options(-Qunused-arguments) elseif(EMSCRIPTEN) set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --memory-init-file 0") # Leave only exported symbols as public and aggressively remove others set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fdata-sections -ffunction-sections -Wl,--gc-sections -fvisibility=hidden") # Optimisation level set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3") # Re-enable exception catching (optimisations above -O1 disable it) set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s DISABLE_EXCEPTION_CATCHING=0") # Remove any code related to exit (such as atexit) set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NO_EXIT_RUNTIME=1") # Remove any code related to filesystem access set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NO_FILESYSTEM=1") # Remove variables even if it needs to be duplicated (can improve speed at the cost of size) set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s AGGRESSIVE_VARIABLE_ELIMINATION=1") # Allow memory growth, but disable some optimisations set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s ALLOW_MEMORY_GROWTH=1") # Disable eval() set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NO_DYNAMIC_EXECUTION=1") # Disable greedy exception catcher set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NODEJS_CATCH_EXIT=0") # Abort if linking results in any undefined symbols # Note: this is on by default in the CMake Emscripten module which we aren't using set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s ERROR_ON_UNDEFINED_SYMBOLS=1") # Disallow deprecated emscripten build options. set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s STRICT=1") # Export the Emscripten-generated auxiliary methods which are needed by solc-js. # Which methods of libsolc itself are exported is specified in libsolc/CMakeLists.txt. set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s EXTRA_EXPORTED_RUNTIME_METHODS=['cwrap','addFunction','removeFunction','Pointer_stringify','lengthBytesUTF8','_malloc','stringToUTF8','setValue']") # Do not build as a WebAssembly target - we need an asm.js output. set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s WASM=0") endif() endif() # The major alternative compiler to GCC/Clang is Microsoft's Visual C++ compiler, only available on Windows. elseif (DEFINED MSVC) add_compile_options(/MP) # enable parallel compilation add_compile_options(/EHsc) # specify Exception Handling Model in msvc add_compile_options(/WX) # enable warnings-as-errors add_compile_options(/wd4068) # disable unknown pragma warning (4068) add_compile_options(/wd4996) # disable unsafe function warning (4996) add_compile_options(/wd4503) # disable decorated name length exceeded, name was truncated (4503) add_compile_options(/wd4267) # disable conversion from 'size_t' to 'type', possible loss of data (4267) add_compile_options(/wd4180) # disable qualifier applied to function type has no meaning; ignored (4180) add_compile_options(/wd4290) # disable C++ exception specification ignored except to indicate a function is not __declspec(nothrow) (4290) add_compile_options(/wd4244) # disable conversion from 'type1' to 'type2', possible loss of data (4244) add_compile_options(/wd4800) # disable forcing value to bool 'true' or 'false' (performance warning) (4800) add_compile_options(-D_WIN32_WINNT=0x0600) # declare Windows Vista API requirement add_compile_options(-DNOMINMAX) # undefine windows.h MAX && MIN macros cause it cause conflicts with std::min && std::max functions add_compile_options(/utf-8) # enable utf-8 encoding (solves warning 4819) # disable empty object file warning set(CMAKE_STATIC_LINKER_FLAGS "${CMAKE_STATIC_LINKER_FLAGS} /ignore:4221") # warning LNK4075: ignoring '/EDITANDCONTINUE' due to '/SAFESEH' specification # warning LNK4099: pdb was not found with lib # stack size 16MB set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /ignore:4099,4075 /STACK:16777216") # If you don't have GCC, Clang or VC++ then you are on your own. Good luck! else () message(WARNING "Your compiler is not tested, if you run into any issues, we'd welcome any patches.") endif () if (SANITIZE) # Perform case-insensitive string compare string(TOLOWER "${SANITIZE}" san) # -fno-omit-frame-pointer gives more informative stack trace in case of an error # -fsanitize-address-use-after-scope throws an error when a variable is used beyond its scope if (san STREQUAL "address") set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-omit-frame-pointer -fsanitize=address -fsanitize-address-use-after-scope") endif() endif() # Code coverage support. # Copied from Cable: # https://github.com/ethereum/cable/blob/v0.2.4/CableCompilerSettings.cmake#L118-L132 option(COVERAGE "Build with code coverage support" OFF) if(COVERAGE) # Set the linker flags first, they are required to properly test the compiler flag. set(CMAKE_SHARED_LINKER_FLAGS "--coverage ${CMAKE_SHARED_LINKER_FLAGS}") set(CMAKE_EXE_LINKER_FLAGS "--coverage ${CMAKE_EXE_LINKER_FLAGS}") set(CMAKE_REQUIRED_LIBRARIES "--coverage ${CMAKE_REQUIRED_LIBRARIES}") check_cxx_compiler_flag(--coverage have_coverage) string(REPLACE "--coverage " "" CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES}) if(NOT have_coverage) message(FATAL_ERROR "Coverage not supported") endif() add_compile_options(-g --coverage) endif() # SMT Solvers integration option(USE_Z3 "Allow compiling with Z3 SMT solver integration" ON) option(USE_CVC4 "Allow compiling with CVC4 SMT solver integration" ON) if (("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")) option(USE_LD_GOLD "Use GNU gold linker" ON) if (USE_LD_GOLD) execute_process(COMMAND ${CMAKE_CXX_COMPILER} -fuse-ld=gold -Wl,--version ERROR_QUIET OUTPUT_VARIABLE LD_VERSION) if ("${LD_VERSION}" MATCHES "GNU gold") set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fuse-ld=gold") endif () endif () endif ()