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cmake_minimum_required(VERSION 3.1.3)
project(GSL CXX)
include(ExternalProject)
find_package(Git)
# creates a library GSL which is an interface (header files only)
add_library(GSL INTERFACE)
# determine whether this is a standalone project or included by other projects
set(GSL_STANDALONE_PROJECT OFF)
if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
set(GSL_STANDALONE_PROJECT ON)
endif ()
set(GSL_CXX_STANDARD "14" CACHE STRING "Use c++ standard")
set(GSL_CXX_STD "cxx_std_${GSL_CXX_STANDARD}")
if (MSVC)
set(GSL_CXX_STD_OPT "-std:c++${GSL_CXX_STANDARD}")
else()
set(GSL_CXX_STD_OPT "-std=c++${GSL_CXX_STANDARD}")
endif()
# when minimum version required is 3.8.0 remove if below
# both branches do exactly the same thing
if (CMAKE_VERSION VERSION_LESS 3.7.9)
include(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG("${GSL_CXX_STD_OPT}" COMPILER_SUPPORTS_CXX_STANDARD)
if(COMPILER_SUPPORTS_CXX_STANDARD)
target_compile_options(GSL INTERFACE "${GSL_CXX_STD_OPT}")
else()
message(FATAL_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no c++${GSL_CXX_STANDARD} support. Please use a different C++ compiler.")
endif()
else ()
target_compile_features(GSL INTERFACE "${GSL_CXX_STD}")
# on *nix systems force the use of -std=c++XX instead of -std=gnu++XX (default)
set(CMAKE_CXX_EXTENSIONS OFF)
endif()
# add definitions to the library and targets that consume it
target_compile_definitions(GSL INTERFACE
$<$<CXX_COMPILER_ID:MSVC>:
# remove unnecessary warnings about unchecked iterators
_SCL_SECURE_NO_WARNINGS
# remove deprecation warnings about std::uncaught_exception() (from catch)
_SILENCE_CXX17_UNCAUGHT_EXCEPTION_DEPRECATION_WARNING
>
)
# add include folders to the library and targets that consume it
# the SYSTEM keyword suppresses warnings for users of the library
if(GSL_STANDALONE_PROJECT)
target_include_directories(GSL INTERFACE
$<BUILD_INTERFACE:
${CMAKE_CURRENT_SOURCE_DIR}/include
>
)
else()
target_include_directories(GSL SYSTEM INTERFACE
$<BUILD_INTERFACE:
${CMAKE_CURRENT_SOURCE_DIR}/include
>
)
endif()
if (CMAKE_VERSION VERSION_GREATER 3.7.8)
if (MSVC_IDE)
option(VS_ADD_NATIVE_VISUALIZERS "Configure project to use Visual Studio native visualizers" TRUE)
else()
set(VS_ADD_NATIVE_VISUALIZERS FALSE CACHE INTERNAL "Native visualizers are Visual Studio extension" FORCE)
endif()
# add natvis file to the library so it will automatically be loaded into Visual Studio
if(VS_ADD_NATIVE_VISUALIZERS)
target_sources(GSL INTERFACE
${CMAKE_CURRENT_SOURCE_DIR}/GSL.natvis
)
endif()
endif()
install(
DIRECTORY include/gsl
DESTINATION include
)
option(GSL_TEST "Generate tests." ${GSL_STANDALONE_PROJECT})
if (GSL_TEST)
enable_testing()
add_subdirectory(tests)
endif ()
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