libcryfs/utils.cmake

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CMake
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include(CheckCXXCompilerFlag)
###################################################
# Activate C++14
#
# Uses: target_activate_cpp14(buildtarget)
###################################################
function(target_activate_cpp14 TARGET)
check_cxx_compiler_flag("-std=c++14" COMPILER_HAS_CPP14_SUPPORT)
IF (COMPILER_HAS_CPP14_SUPPORT)
target_compile_options(${TARGET} PUBLIC -std=c++14)
ELSE()
check_cxx_compiler_flag("-std=c++1y" COMPILER_HAS_CPP14_PARTIAL_SUPPORT)
IF (COMPILER_HAS_CPP14_PARTIAL_SUPPORT)
target_compile_options(${TARGET} PUBLIC -std=c++1y)
ELSE()
message(FATAL_ERROR "Compiler doesn't support C++14")
ENDIF()
ENDIF()
IF(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
target_compile_options(${TARGET} PUBLIC -stdlib=libc++)
ENDIF()
endfunction(target_activate_cpp14)
#################################################
# Enable style compiler warnings
#
# Uses: target_enable_style_warnings(buildtarget)
#################################################
function(target_enable_style_warnings TARGET)
target_compile_options(${TARGET} PRIVATE -Wall -Wextra)
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)
find_package(Boost 1.56.0
REQUIRED
COMPONENTS ${ARGN})
target_include_directories(${TARGET} SYSTEM PUBLIC ${Boost_INCLUDE_DIRS})
target_link_libraries(${TARGET} PUBLIC ${Boost_LIBRARIES})
if(${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)
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##################################################
# Specify that a specific minimal version of gcc is required
#
# Uses:
# require_gcc_version(4.9)
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##################################################
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function(require_gcc_version VERSION)
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if (CMAKE_COMPILER_IS_GNUCXX)
execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION)
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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})
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endif (CMAKE_COMPILER_IS_GNUCXX)
endfunction(require_gcc_version)
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##################################################
# Specify that a specific minimal version of clang is required
#
# Uses:
# require_clang_version(3.5)
##################################################
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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})
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endfunction(find_library_with_path)