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CableCompilerSettings.cmake
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CableCompilerSettings.cmake
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# Cable: CMake Bootstrap Library <https://github.com/ethereum/cable>
# Copyright 2018-2020 Pawel Bylica.
# Licensed under the Apache License, Version 2.0.
# Cable Compiler Settings, version 1.0.1
#
# This CMake module provides default configuration (with some options)
# for C/C++ compilers. Use cable_configure_compiler().
#
# CHANGELOG
#
# 1.0.1 - 2020-01-30
# - Do not explicitly set -mtune=generic, this is default anyway.
#
# 1.0.0 - 2019-12-20
if(cable_compiler_settings_included)
return()
endif()
set(cable_compiler_settings_included TRUE)
include(CheckCXXCompilerFlag)
# Adds CXX compiler flag if the flag is supported by the compiler.
#
# This is effectively a combination of CMake's check_cxx_compiler_flag()
# and add_compile_options():
#
# if(check_cxx_compiler_flag(flag))
# add_compile_options(flag)
#
function(cable_add_cxx_compiler_flag_if_supported FLAG)
# Remove leading - or / from the flag name.
string(REGEX REPLACE "^-|/" "" name ${FLAG})
check_cxx_compiler_flag(${FLAG} ${name})
if(${name})
add_compile_options(${FLAG})
endif()
# If the optional argument passed, store the result there.
if(ARGV1)
set(${ARGV1} ${name} PARENT_SCOPE)
endif()
endfunction()
# Configures the compiler with default flags.
macro(cable_configure_compiler)
if(NOT PROJECT_SOURCE_DIR)
message(FATAL_ERROR "cable_configure_compiler() must be used after project()")
endif()
# Determine if this is the main or a subproject. Leave this variable available for later use.
if(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
set(PROJECT_IS_MAIN TRUE)
else()
set(PROJECT_IS_MAIN FALSE)
endif()
if(PROJECT_IS_MAIN)
# Do this configuration only in the main project.
cmake_parse_arguments(cable "NO_CONVERSION_WARNINGS;NO_STACK_PROTECTION;NO_PEDANTIC" "" "" ${ARGN})
if(cable_UNPARSED_ARGUMENTS)
message(FATAL_ERROR "cable_configure_compiler: Unknown options: ${cable_UNPARSED_ARGUMENTS}")
endif()
# Set helper variables recognizing C++ compilers.
if(${CMAKE_CXX_COMPILER_ID} STREQUAL GNU)
set(CABLE_COMPILER_GNU TRUE)
elseif(${CMAKE_CXX_COMPILER_ID} MATCHES Clang)
# This matches both clang and AppleClang.
set(CABLE_COMPILER_CLANG TRUE)
endif()
if(CABLE_COMPILER_GNU OR CABLE_COMPILER_CLANG)
set(CABLE_COMPILER_GNULIKE TRUE)
endif()
if(CABLE_COMPILER_GNULIKE)
if(NOT cable_NO_PEDANTIC)
add_compile_options(-Wpedantic)
endif()
# Enable basing warnings set and treat them as errors.
add_compile_options(-Werror -Wall -Wextra -Wshadow)
if(NOT cable_NO_CONVERSION_WARNINGS)
# Enable conversion warnings if not explicitly disabled.
add_compile_options(-Wconversion -Wsign-conversion)
endif()
# Allow unknown pragmas, we don't want to wrap them with #ifdefs.
add_compile_options(-Wno-unknown-pragmas)
# Stack protection.
check_cxx_compiler_flag(-fstack-protector fstack-protector)
if(fstack-protector)
# The compiler supports stack protection options.
if(cable_NO_STACK_PROTECTION)
# Stack protection explicitly disabled.
# Add "no" flag, because in some configuration the compiler has it enabled by default.
add_compile_options(-fno-stack-protector)
else()
# Try enabling the "strong" variant.
cable_add_cxx_compiler_flag_if_supported(-fstack-protector-strong have_stack_protector_strong_support)
if(NOT have_stack_protector_strong_support)
# Fallback to standard variant if "strong" not available.
add_compile_options(-fstack-protector)
endif()
endif()
endif()
cable_add_cxx_compiler_flag_if_supported(-Wimplicit-fallthrough)
elseif(MSVC)
# Get rid of default warning level.
string(REPLACE " /W3" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
string(REPLACE " /W3" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
# Enable basing warnings set and treat them as errors.
add_compile_options(/W4 /WX)
# Allow unknown pragmas, we don't want to wrap them with #ifdefs.
add_compile_options(/wd4068)
endif()
# Option for arch=native.
option(NATIVE "Build for native CPU" OFF)
if(NATIVE)
if(MSVC)
add_compile_options(-arch:AVX)
else()
add_compile_options(-mtune=native -march=native)
endif()
endif()
# Sanitizers support.
set(SANITIZE OFF CACHE STRING "Build with the specified sanitizer")
if(SANITIZE)
# Set the linker flags first, they are required to properly test the compiler flag.
set(CMAKE_SHARED_LINKER_FLAGS "-fsanitize=${SANITIZE} ${CMAKE_SHARED_LINKER_FLAGS}")
set(CMAKE_EXE_LINKER_FLAGS "-fsanitize=${SANITIZE} ${CMAKE_EXE_LINKER_FLAGS}")
set(test_name have_fsanitize_${SANITIZE})
check_cxx_compiler_flag(-fsanitize=${SANITIZE} ${test_name})
if(NOT ${test_name})
message(FATAL_ERROR "Unsupported sanitizer: ${SANITIZE}")
endif()
add_compile_options(-fno-omit-frame-pointer -fsanitize=${SANITIZE})
set(blacklist_file ${PROJECT_SOURCE_DIR}/sanitizer-blacklist.txt)
if(EXISTS ${blacklist_file})
cable_add_cxx_compiler_flag_if_supported(-fsanitize-blacklist=${blacklist_file})
endif()
unset(blacklist_file)
endif()
# The "Coverage" build type.
if(CABLE_COMPILER_CLANG)
set(CMAKE_CXX_FLAGS_COVERAGE "-fprofile-instr-generate -fcoverage-mapping")
elseif(CABLE_COMPILER_GNU)
set(CMAKE_CXX_FLAGS_COVERAGE "--coverage")
endif()
endif()
endmacro()