libcryfs/utils.cmake
2017-12-03 19:01:41 +00:00

148 lines
7.3 KiB
CMake

include(CheckCXXCompilerFlag)
###################################################
# Activate C++14
#
# Uses: target_activate_cpp14(buildtarget)
###################################################
function(target_activate_cpp14 TARGET)
if("${CMAKE_VERSION}" VERSION_GREATER "3.1")
set_property(TARGET ${TARGET} PROPERTY CXX_STANDARD 14)
set_property(TARGET ${TARGET} PROPERTY CXX_STANDARD_REQUIRED ON)
else("${CMAKE_VERSION}" VERSION_GREATER "3.1")
check_cxx_compiler_flag("-std=c++14" COMPILER_HAS_CPP14_SUPPORT)
if (COMPILER_HAS_CPP14_SUPPORT)
target_compile_options(${TARGET} PUBLIC -std=c++14)
else(COMPILER_HAS_CPP14_SUPPORT)
check_cxx_compiler_flag("-std=c++1y" COMPILER_HAS_CPP14_PARTIAL_SUPPORT)
if (COMPILER_HAS_CPP14_PARTIAL_SUPPORT)
target_compile_options(${TARGET} PUBLIC -std=c++1y)
else()
message(FATAL_ERROR "Compiler doesn't support C++14")
endif()
endif(COMPILER_HAS_CPP14_SUPPORT)
endif("${CMAKE_VERSION}" VERSION_GREATER "3.1")
# Ideally, we'd like to use libc++ on linux as well, but:
# - http://stackoverflow.com/questions/37096062/get-a-basic-c-program-to-compile-using-clang-on-ubuntu-16
# - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=808086
# so only use it on Apple systems...
if(CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND APPLE)
target_compile_options(${TARGET} PUBLIC -stdlib=libc++)
endif(CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND APPLE)
endfunction(target_activate_cpp14)
# Find clang-tidy executable (for use in target_enable_style_warnings)
find_program(
CLANG_TIDY_EXE
NAMES "clang-tidy"
DOC "Path to clang-tidy executable"
)
if(NOT CLANG_TIDY_EXE)
message(WARNING "clang-tidy not found. Checks are disabled")
else()
message(STATUS "clang-tidy found: ${CLANG_TIDY_EXE}")
set(DO_CLANG_TIDY "${CLANG_TIDY_EXE}" "-system-headers=0")
endif()
#################################################
# Enable style compiler warnings
#
# Uses: target_enable_style_warnings(buildtarget)
#################################################
function(target_enable_style_warnings TARGET)
# Enable compiler options
target_compile_options(${TARGET} PRIVATE -Wall -Wextra -Wold-style-cast -Wcast-align) # TODO consider -Wpedantic -Wchkp -Wcast-qual -Wctor-dtor-privacy -Wdisabled-optimization -Wformat=2 -Winit-self -Wlogical-op -Wmissing-include-dirs -Wnoexcept -Wold-style-cast -Woverloaded-virtual -Wredundant-decls -Wshadow -Wsign-promo -Wstrict-null-sentinel -Wstrict-overflow=5 -Wundef -Wno-unused -Wno-variadic-macros -Wno-parentheses -fdiagnostics-show-option -Wconversion and others?
# Enable clang-tidy
#set_target_properties(
# ${TARGET} PROPERTIES
# CXX_CLANG_TIDY "${DO_CLANG_TIDY}"
#)
endfunction(target_enable_style_warnings)
##################################################
# Add boost to the project
#
# Uses:
# target_add_boost(buildtarget) # if you're only using header-only boost libs
# target_add_boost(buildtarget system filesystem) # list all libraries to link against in the dependencies
##################################################
function(target_add_boost TARGET)
# Load boost libraries
if(NOT DEFINED Boost_USE_STATIC_LIBS OR Boost_USE_STATIC_LIBS)
# Many supported systems don't have boost >= 1.56. Better link it statically.
message(STATUS "Boost will be statically linked")
set(Boost_USE_STATIC_LIBS ON)
else(NOT DEFINED Boost_USE_STATIC_LIBS OR Boost_USE_STATIC_LIBS)
message(STATUS "Boost will be dynamically linked")
set(Boost_USE_STATIC_LIBS OFF)
endif(NOT DEFINED Boost_USE_STATIC_LIBS OR Boost_USE_STATIC_LIBS)
set(BOOST_THREAD_VERSION 4)
find_package(Boost 1.56.0
REQUIRED
COMPONENTS ${ARGN})
target_include_directories(${TARGET} SYSTEM PUBLIC ${Boost_INCLUDE_DIRS})
target_link_libraries(${TARGET} PUBLIC ${Boost_LIBRARIES})
target_compile_definitions(${TARGET} PUBLIC BOOST_THREAD_VERSION=4)
if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
# Also link to rt, because boost thread needs that.
target_link_libraries(${TARGET} PUBLIC rt)
endif(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
endfunction(target_add_boost)
##################################################
# Specify that a specific minimal version of gcc is required
#
# Uses:
# require_gcc_version(4.9)
##################################################
function(require_gcc_version VERSION)
if (CMAKE_COMPILER_IS_GNUCXX)
execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION)
if (GCC_VERSION VERSION_LESS ${VERSION})
message(FATAL_ERROR "Needs at least gcc version ${VERSION}, found gcc ${GCC_VERSION}")
endif (GCC_VERSION VERSION_LESS ${VERSION})
endif (CMAKE_COMPILER_IS_GNUCXX)
endfunction(require_gcc_version)
##################################################
# Specify that a specific minimal version of clang is required
#
# Uses:
# require_clang_version(3.5)
##################################################
function(require_clang_version VERSION)
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS ${VERSION})
message(FATAL_ERROR "Needs at least clang version ${VERSION}, found clang ${CMAKE_CXX_COMPILER_VERSION}")
endif (CMAKE_CXX_COMPILER_VERSION VERSION_LESS ${VERSION})
endif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
endfunction(require_clang_version)
##################################################
# Find the location of a library and return its full path in OUTPUT_VARIABLE.
# If PATH_VARIABLE points to a defined variable, then the library will only be searched in this path.
# If PATH_VARIABLE points to a undefined variable, default system locations will be searched.
#
# Uses (the following will search for fuse in system locations by default, and if the user passes -DFUSE_LIB_PATH to cmake, it will only search in this path.
# find_library_with_path(MYLIBRARY fuse FUSE_LIB_PATH)
# target_link_library(target ${MYLIBRARY})
##################################################
function(find_library_with_path OUTPUT_VARIABLE LIBRARY_NAME PATH_VARIABLE)
if(${PATH_VARIABLE})
find_library(${OUTPUT_VARIABLE} ${LIBRARY_NAME} PATHS ${${PATH_VARIABLE}} NO_DEFAULT_PATH)
if (${OUTPUT_VARIABLE} MATCHES NOTFOUND)
message(FATAL_ERROR "Didn't find ${LIBRARY_NAME} in path specified by the ${PATH_VARIABLE} parameter (${${PATH_VARIABLE}}). Pass in the correct path or remove the parameter to try common system locations.")
else(${OUTPUT_VARIABLE} MATCHES NOTFOUND)
message(STATUS "Found ${LIBRARY_NAME} in user-defined path ${${PATH_VARIABLE}}")
endif(${OUTPUT_VARIABLE} MATCHES NOTFOUND)
else(${PATH_VARIABLE})
find_library(${OUTPUT_VARIABLE} ${LIBRARY_NAME})
if (${OUTPUT_VARIABLE} MATCHES NOTFOUND)
message(FATAL_ERROR "Didn't find ${LIBRARY_NAME} library. If ${LIBRARY_NAME} is installed, try passing in the library location with -D${PATH_VARIABLE}=/path/to/${LIBRARY_NAME}/lib.")
else(${OUTPUT_VARIABLE} MATCHES NOTFOUND)
message(STATUS "Found ${LIBRARY_NAME} in system location")
endif(${OUTPUT_VARIABLE} MATCHES NOTFOUND)
endif(${PATH_VARIABLE})
endfunction(find_library_with_path)