2016-08-01 05:25:37 +00:00
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#------------------------------------------------------------------------------
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# EthCompilerSettings.cmake
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#
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# CMake file for cpp-ethereum project which specifies our compiler settings
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# for each supported platform and build configuration.
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#
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# See http://www.ethdocs.org/en/latest/ethereum-clients/cpp-ethereum/.
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#
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# Copyright (c) 2014-2016 cpp-ethereum contributors.
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#------------------------------------------------------------------------------
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# Clang seeks to be command-line compatible with GCC as much as possible, so
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# most of our compiler settings are common between GCC and Clang.
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#
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# These settings then end up spanning all POSIX platforms (Linux, OS X, BSD, etc)
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# Use ccache if available
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find_program(CCACHE_FOUND ccache)
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if(CCACHE_FOUND)
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set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
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set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)
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message("Using ccache")
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endif(CCACHE_FOUND)
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2017-08-23 12:01:51 +00:00
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include(CheckCXXCompilerFlag)
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check_cxx_compiler_flag(-fstack-protector-strong have_stack_protector_strong)
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if (have_stack_protector_strong)
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add_compile_options(-fstack-protector-strong)
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else()
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check_cxx_compiler_flag(-fstack-protector have_stack_protector)
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if(have_stack_protector)
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add_compile_options(-fstack-protector)
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endif()
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endif()
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2016-08-01 05:25:37 +00:00
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if (("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang"))
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# Use ISO C++11 standard language.
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set(CMAKE_CXX_FLAGS -std=c++11)
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# Enables all the warnings about constructions that some users consider questionable,
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# and that are easy to avoid. Also enable some extra warning flags that are not
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# enabled by -Wall. Finally, treat at warnings-as-errors, which forces developers
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# to fix warnings as they arise, so they don't accumulate "to be fixed later".
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add_compile_options(-Wall)
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add_compile_options(-Wextra)
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add_compile_options(-Werror)
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# Disable warnings about unknown pragmas (which is enabled by -Wall). I assume we have external
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# dependencies (probably Boost) which have some of these. Whatever the case, we shouldn't be
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# disabling these globally. Instead, we should pragma around just the problem #includes.
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#
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# TODO - Track down what breaks if we do NOT do this.
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add_compile_options(-Wno-unknown-pragmas)
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# To get the code building on FreeBSD and Arch Linux we seem to need the following
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# warning suppression to work around some issues in Boost headers.
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#
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# See the following reports:
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# https://github.com/ethereum/webthree-umbrella/issues/384
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# https://github.com/ethereum/webthree-helpers/pull/170
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#
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# The issue manifest as warnings-as-errors like the following:
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#
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# /usr/local/include/boost/multiprecision/cpp_int.hpp:181:4: error:
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# right operand of shift expression '(1u << 63u)' is >= than the precision of the left operand
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#
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# -fpermissive is a pretty nasty way to address this. It is described as follows:
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#
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# Downgrade some diagnostics about nonconformant code from errors to warnings.
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# Thus, using -fpermissive will allow some nonconforming code to compile.
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#
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# NB: Have to use this form for the setting, so that it only applies to C++ builds.
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# Applying -fpermissive to a C command-line (ie. secp256k1) gives a build error.
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fpermissive")
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# Configuration-specific compiler settings.
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2017-02-09 14:56:18 +00:00
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set(CMAKE_CXX_FLAGS_DEBUG "-O0 -g -DETH_DEBUG")
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2016-08-01 05:25:37 +00:00
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set(CMAKE_CXX_FLAGS_MINSIZEREL "-Os -DNDEBUG")
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set(CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG")
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set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -g")
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# Additional GCC-specific compiler settings.
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if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
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# Check that we've got GCC 4.7 or newer.
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execute_process(
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COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION)
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if (NOT (GCC_VERSION VERSION_GREATER 4.7 OR GCC_VERSION VERSION_EQUAL 4.7))
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message(FATAL_ERROR "${PROJECT_NAME} requires g++ 4.7 or greater.")
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endif ()
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2017-06-29 14:46:55 +00:00
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# Until https://github.com/ethereum/solidity/issues/2479 is handled
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# disable all implicit fallthrough warnings in the codebase for GCC > 7.0
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if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 7.0)
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add_compile_options(-Wno-implicit-fallthrough)
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endif()
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2016-08-01 05:25:37 +00:00
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# Additional Clang-specific compiler settings.
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elseif ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
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# A couple of extra warnings suppressions which we seemingly
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# need when building with Clang.
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#
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# TODO - Nail down exactly where these warnings are manifesting and
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# try to suppress them in a more localized way. Notes in this file
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# indicate that the first is needed for sepc256k1 and that the
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# second is needed for the (clog, cwarn) macros. These will need
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# testing on at least OS X and Ubuntu.
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add_compile_options(-Wno-unused-function)
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add_compile_options(-Wno-dangling-else)
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# Some Linux-specific Clang settings. We don't want these for OS X.
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if ("${CMAKE_SYSTEM_NAME}" MATCHES "Linux")
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# TODO - Is this even necessary? Why?
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# See http://stackoverflow.com/questions/19774778/when-is-it-necessary-to-use-use-the-flag-stdlib-libstdc.
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add_compile_options(-stdlib=libstdc++)
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# Tell Boost that we're using Clang's libc++. Not sure exactly why we need to do.
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add_definitions(-DBOOST_ASIO_HAS_CLANG_LIBCXX)
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# Use fancy colors in the compiler diagnostics
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add_compile_options(-fcolor-diagnostics)
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# See "How to silence unused command line argument error with clang without disabling it?"
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# When using -Werror with clang, it transforms "warning: argument unused during compilation" messages
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# into errors, which makes sense.
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# http://stackoverflow.com/questions/21617158/how-to-silence-unused-command-line-argument-error-with-clang-without-disabling-i
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add_compile_options(-Qunused-arguments)
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endif()
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if (EMSCRIPTEN)
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2017-07-18 20:57:47 +00:00
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# Do emit a separate memory initialiser file
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --memory-init-file 0")
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# Leave only exported symbols as public and agressively remove others
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fdata-sections -ffunction-sections -Wl,--gc-sections -fvisibility=hidden")
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# Optimisation level
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3")
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# Re-enable exception catching (optimisations above -O1 disable it)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s DISABLE_EXCEPTION_CATCHING=0")
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# Remove any code related to exit (such as atexit)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NO_EXIT_RUNTIME=1")
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# Remove any code related to filesystem access
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NO_FILESYSTEM=1")
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# Remove variables even if it needs to be duplicated (can improve speed at the cost of size)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s AGGRESSIVE_VARIABLE_ELIMINATION=1")
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# Allow memory growth, but disable some optimisations
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s ALLOW_MEMORY_GROWTH=1")
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# Disable eval()
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NO_DYNAMIC_EXECUTION=1")
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2016-08-01 05:25:37 +00:00
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add_definitions(-DETH_EMSCRIPTEN=1)
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endif()
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endif()
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# The major alternative compiler to GCC/Clang is Microsoft's Visual C++ compiler, only available on Windows.
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elseif (DEFINED MSVC)
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add_compile_options(/MP) # enable parallel compilation
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add_compile_options(/EHsc) # specify Exception Handling Model in msvc
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add_compile_options(/WX) # enable warnings-as-errors
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add_compile_options(/wd4068) # disable unknown pragma warning (4068)
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add_compile_options(/wd4996) # disable unsafe function warning (4996)
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add_compile_options(/wd4503) # disable decorated name length exceeded, name was truncated (4503)
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add_compile_options(/wd4267) # disable conversion from 'size_t' to 'type', possible loss of data (4267)
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add_compile_options(/wd4180) # disable qualifier applied to function type has no meaning; ignored (4180)
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add_compile_options(/wd4290) # disable C++ exception specification ignored except to indicate a function is not __declspec(nothrow) (4290)
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add_compile_options(/wd4244) # disable conversion from 'type1' to 'type2', possible loss of data (4244)
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add_compile_options(/wd4800) # disable forcing value to bool 'true' or 'false' (performance warning) (4800)
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add_compile_options(-D_WIN32_WINNT=0x0600) # declare Windows Vista API requirement
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add_compile_options(-DNOMINMAX) # undefine windows.h MAX && MIN macros cause it cause conflicts with std::min && std::max functions
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# Always use Release variant of C++ runtime.
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# We don't want to provide Debug variants of all dependencies. Some default
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# flags set by CMake must be tweaked.
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2016-10-27 14:29:42 +00:00
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string(REPLACE "/MDd" "/MD" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
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string(REPLACE "/D_DEBUG" "" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
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string(REPLACE "/RTC1" "" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
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string(REPLACE "/MDd" "/MD" CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
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string(REPLACE "/D_DEBUG" "" CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
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string(REPLACE "/RTC1" "" CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
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2016-08-01 05:25:37 +00:00
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set_property(GLOBAL PROPERTY DEBUG_CONFIGURATIONS OFF)
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# disable empty object file warning
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set(CMAKE_STATIC_LINKER_FLAGS "${CMAKE_STATIC_LINKER_FLAGS} /ignore:4221")
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# warning LNK4075: ignoring '/EDITANDCONTINUE' due to '/SAFESEH' specification
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# warning LNK4099: pdb was not found with lib
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# stack size 16MB
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set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /ignore:4099,4075 /STACK:16777216")
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# If you don't have GCC, Clang or VC++ then you are on your own. Good luck!
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else ()
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message(WARNING "Your compiler is not tested, if you run into any issues, we'd welcome any patches.")
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endif ()
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if (SANITIZE)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-omit-frame-pointer -fsanitize=${SANITIZE}")
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if (${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize-blacklist=${CMAKE_SOURCE_DIR}/sanitizer-blacklist.txt")
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endif()
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endif()
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if (PROFILING AND (("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")))
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set(CMAKE_CXX_FLAGS "-g ${CMAKE_CXX_FLAGS}")
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set(CMAKE_C_FLAGS "-g ${CMAKE_C_FLAGS}")
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add_definitions(-DETH_PROFILING_GPERF)
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set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -lprofiler")
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# set(CMAKE_STATIC_LINKER_FLAGS "${CMAKE_STATIC_LINKER_FLAGS} -lprofiler")
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set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lprofiler")
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endif ()
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if (PROFILING AND (("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")))
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set(CMAKE_CXX_FLAGS "-g --coverage ${CMAKE_CXX_FLAGS}")
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set(CMAKE_C_FLAGS "-g --coverage ${CMAKE_C_FLAGS}")
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set(CMAKE_SHARED_LINKER_FLAGS "--coverage ${CMAKE_SHARED_LINKER_FLAGS} -lprofiler")
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set(CMAKE_EXE_LINKER_FLAGS "--coverage ${CMAKE_EXE_LINKER_FLAGS} -lprofiler")
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endif ()
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if (("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang"))
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option(USE_LD_GOLD "Use GNU gold linker" ON)
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if (USE_LD_GOLD)
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execute_process(COMMAND ${CMAKE_C_COMPILER} -fuse-ld=gold -Wl,--version ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
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if ("${LD_VERSION}" MATCHES "GNU gold")
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fuse-ld=gold")
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fuse-ld=gold")
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endif ()
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endif ()
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endif ()
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