cmake_minimum_required(VERSION 3.0.2)

project(GSLTests CXX)

include(FindPkgConfig)
include(ExternalProject)

find_package(Git REQUIRED QUIET)

# will make visual studio generated project group files
set_property(GLOBAL PROPERTY USE_FOLDERS ON)

pkg_search_module(GTestMain gtest_main)
if (NOT GTestMain_FOUND)
    configure_file(CMakeLists.txt.in googletest-download/CMakeLists.txt)
    execute_process(
        COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
        RESULT_VARIABLE result
        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download
    )
    if(result)
        message(FATAL_ERROR "CMake step for googletest failed: ${result}")
    endif()

    execute_process(
        COMMAND ${CMAKE_COMMAND} --build .
        RESULT_VARIABLE result
        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download
    )
    if(result)
        message(FATAL_ERROR "CMake step for googletest failed: ${result}")
    endif()

    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
    set(GTestMain_LIBRARIES gtest_main)

    add_subdirectory(
        ${CMAKE_CURRENT_BINARY_DIR}/googletest-src
        ${CMAKE_CURRENT_BINARY_DIR}/googletest-build
        EXCLUDE_FROM_ALL
    )
endif()

if (MSVC AND (GSL_CXX_STANDARD EQUAL 17))
    set(GSL_CPLUSPLUS_OPT -Zc:__cplusplus -permissive-)
endif()

# this interface adds compile options to how the tests are run
# please try to keep entries ordered =)
add_library(gsl_tests_config INTERFACE)
if(MSVC) # MSVC or simulating MSVC
    target_compile_options(gsl_tests_config INTERFACE
        ${GSL_CPLUSPLUS_OPT}
        /EHsc
        /W4
        /WX
        $<$<CXX_COMPILER_ID:MSVC>:
          /wd4996  # Use of function or classes marked [[deprecated]]
          /wd26409 # CppCoreCheck - GTest
          /wd26426 # CppCoreCheck - GTest
          /wd26440 # CppCoreCheck - GTest
          /wd26446 # CppCoreCheck - prefer gsl::at()
          /wd26472 # CppCoreCheck - use gsl::narrow(_cast)
          /wd26481 # CppCoreCheck - use span instead of pointer arithmetic
          $<$<VERSION_LESS:$<CXX_COMPILER_VERSION>,1920>: # VS2015
            /wd4189 # variable is initialized but not referenced
            $<$<NOT:$<CONFIG:Debug>>: # Release, RelWithDebInfo
              /wd4702 # Unreachable code
            >
          >
        >
        $<$<CXX_COMPILER_ID:Clang>:
          -Weverything
          -Wno-c++98-compat
          -Wno-c++98-compat-pedantic
          -Wno-covered-switch-default # GTest
          -Wno-deprecated-declarations # Allow tests for [[deprecated]] elements
          -Wno-global-constructors # GTest
          -Wno-language-extension-token # GTest gtest-port.h
          -Wno-missing-braces
          -Wno-missing-prototypes
          -Wno-shift-sign-overflow # GTest gtest-port.h
          -Wno-undef # GTest
          -Wno-used-but-marked-unused # GTest EXPECT_DEATH
          $<$<EQUAL:${GSL_CXX_STANDARD},14>: # no support for [[maybe_unused]]
            -Wno-unused-member-function
            -Wno-unused-variable
          >
        >
    )
else()
    target_compile_options(gsl_tests_config INTERFACE
        -fno-strict-aliasing
        -Wall
        -Wcast-align
        -Wconversion
        -Wctor-dtor-privacy
        -Werror
        -Wextra
        -Wpedantic
        -Wshadow
        -Wsign-conversion
        -Wno-deprecated-declarations # Allow tests for [[deprecated]] elements
        $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:
          -Weverything
          -Wno-c++98-compat
          -Wno-c++98-compat-pedantic
          -Wno-missing-braces
          -Wno-covered-switch-default # GTest
          -Wno-global-constructors # GTest
          -Wno-missing-prototypes
          -Wno-padded
          -Wno-unknown-attributes
          -Wno-used-but-marked-unused # GTest EXPECT_DEATH
          -Wno-weak-vtables
          $<$<EQUAL:${GSL_CXX_STANDARD},14>: # no support for [[maybe_unused]]
            -Wno-unused-member-function
            -Wno-unused-variable
          >
        >
        $<$<CXX_COMPILER_ID:Clang>:
          $<$<AND:$<VERSION_GREATER:$<CXX_COMPILER_VERSION>,4.99>,$<VERSION_LESS:$<CXX_COMPILER_VERSION>,6>>:
            $<$<EQUAL:${GSL_CXX_STANDARD},17>:-Wno-undefined-func-template>
          >
        >
        $<$<CXX_COMPILER_ID:AppleClang>:
          $<$<AND:$<VERSION_GREATER:$<CXX_COMPILER_VERSION>,9.1>,$<VERSION_LESS:$<CXX_COMPILER_VERSION>,10>>:
            $<$<EQUAL:${GSL_CXX_STANDARD},17>:-Wno-undefined-func-template>
          >
        >
        $<$<CXX_COMPILER_ID:GNU>:
          -Wdouble-promotion # float implicit to double
          -Wlogical-op # suspicious uses of logical operators
          $<$<NOT:$<VERSION_LESS:$<CXX_COMPILER_VERSION>,6>>:
            -Wduplicated-cond # duplicated if-else conditions
            -Wmisleading-indentation
            -Wnull-dereference
            $<$<EQUAL:${GSL_CXX_STANDARD},14>: # no support for [[maybe_unused]]
              -Wno-unused-variable
            >
          >
          $<$<NOT:$<VERSION_LESS:$<CXX_COMPILER_VERSION>,7>>:
            -Wduplicated-branches # identical if-else branches
          >
        >
    )
endif(MSVC)

# for tests to find the gtest header
target_include_directories(gsl_tests_config SYSTEM INTERFACE
    googletest/googletest/include
)

set_property(TARGET  PROPERTY FOLDER "GSL_tests")

function(add_gsl_test name)
    add_executable(${name} ${name}.cpp)
    target_link_libraries(${name}
        GSL
        gsl_tests_config
        ${GTestMain_LIBRARIES}
    )
    add_test(
        ${name}
        ${name}
    )
    # group all tests under GSL_tests
    set_property(TARGET ${name} PROPERTY FOLDER "GSL_tests")
endfunction()

add_gsl_test(span_tests)
add_gsl_test(span_ext_tests)
add_gsl_test(span_compatibility_tests)
add_gsl_test(string_span_tests)
add_gsl_test(at_tests)
add_gsl_test(notnull_tests)
add_gsl_test(assertion_tests)
add_gsl_test(utils_tests)
add_gsl_test(owner_tests)
add_gsl_test(byte_tests)
add_gsl_test(algorithm_tests)
add_gsl_test(strict_notnull_tests)


# No exception tests

foreach(flag_var
        CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
        CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
    STRING (REGEX REPLACE "/EHsc" "" ${flag_var} "${${flag_var}}")
endforeach(flag_var)

# this interface adds compile options to how the tests are run
# please try to keep entries ordered =)
add_library(gsl_tests_config_noexcept INTERFACE)
if(MSVC) # MSVC or simulating MSVC
    target_compile_definitions(gsl_tests_config_noexcept INTERFACE
        _HAS_EXCEPTIONS=0 # disable exceptions in the Microsoft STL
    )
    target_compile_options(gsl_tests_config_noexcept INTERFACE
        ${GSL_CPLUSPLUS_OPT}
        /W4
        /WX
        $<$<CXX_COMPILER_ID:MSVC>:
          /wd4577
          /wd4702
          /wd26440 # CppCoreCheck - GTest
          /wd26446 # CppCoreCheck - prefer gsl::at()
        >
        $<$<CXX_COMPILER_ID:Clang>:
          -Weverything
          -Wno-c++98-compat
          -Wno-c++98-compat-pedantic
          -Wno-missing-prototypes
          -Wno-unknown-attributes
        >
    )
else()
    target_compile_options(gsl_tests_config_noexcept INTERFACE
        -fno-exceptions
        -fno-strict-aliasing
        -Wall
        -Wcast-align
        -Wconversion
        -Wctor-dtor-privacy
        -Werror
        -Wextra
        -Wpedantic
        -Wshadow
        -Wsign-conversion
        $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:
          -Weverything
          -Wno-c++98-compat
          -Wno-c++98-compat-pedantic
          -Wno-missing-prototypes
          -Wno-unknown-attributes
          -Wno-weak-vtables
        >
        $<$<CXX_COMPILER_ID:GNU>:
          -Wdouble-promotion # float implicit to double
          -Wlogical-op # suspicious uses of logical operators
          -Wuseless-cast # casting to its own type
          $<$<NOT:$<VERSION_LESS:$<CXX_COMPILER_VERSION>,6>>:
            -Wduplicated-cond # duplicated if-else conditions
            -Wmisleading-indentation
            -Wnull-dereference
          >
          $<$<NOT:$<VERSION_LESS:$<CXX_COMPILER_VERSION>,7>>:
            -Wduplicated-branches # identical if-else branches
          >
          $<$<NOT:$<VERSION_LESS:$<CXX_COMPILER_VERSION>,8>>:
            -Wcast-align=strict # increase alignment (i.e. char* to int*)
          >
        >
    )
endif(MSVC)

function(add_gsl_test_noexcept name)
    add_executable(${name} ${name}.cpp)
    target_link_libraries(${name}
        GSL
        gsl_tests_config_noexcept
        ${GTestMain_LIBRARIES}
    )
    add_test(
      ${name}
      ${name}
    )
    # group all tests under GSL_tests_noexcept
    set_property(TARGET ${name} PROPERTY FOLDER "GSL_tests_noexcept")
endfunction()

add_gsl_test_noexcept(no_exception_ensure_tests)