cmake_minimum_required(VERSION 2.6)
project("mbed TLS" C)

option(USE_PKCS11_HELPER_LIBRARY "Build mbed TLS with the pkcs11-helper library." OFF)
option(ENABLE_ZLIB_SUPPORT "Build mbed TLS with zlib library." OFF)

option(ENABLE_PROGRAMS "Build mbed TLS programs." ON)

option(UNSAFE_BUILD "Allow unsafe builds. These builds ARE NOT SECURE." OFF)

string(REGEX MATCH "Clang" CMAKE_COMPILER_IS_CLANG "${CMAKE_C_COMPILER_ID}")
string(REGEX MATCH "GNU" CMAKE_COMPILER_IS_GNU "${CMAKE_C_COMPILER_ID}")
string(REGEX MATCH "IAR" CMAKE_COMPILER_IS_IAR "${CMAKE_C_COMPILER_ID}")
string(REGEX MATCH "MSVC" CMAKE_COMPILER_IS_MSVC "${CMAKE_C_COMPILER_ID}")

# the test suites currently have compile errors with MSVC
if(CMAKE_COMPILER_IS_MSVC)
    option(ENABLE_TESTING "Build mbed TLS tests." OFF)
else()
    option(ENABLE_TESTING "Build mbed TLS tests." ON)
endif()

# Warning string - created as a list for compatibility with CMake 2.8
set(WARNING_BORDER "*******************************************************\n")
set(NULL_ENTROPY_WARN_L1 "****  WARNING!  MBEDTLS_TEST_NULL_ENTROPY defined!\n")
set(NULL_ENTROPY_WARN_L2 "****  THIS BUILD HAS NO DEFINED ENTROPY SOURCES\n")
set(NULL_ENTROPY_WARN_L3 "****  AND IS *NOT* SUITABLE FOR PRODUCTION USE\n")

set(NULL_ENTROPY_WARNING "${WARNING_BORDER}"
                         "${NULL_ENTROPY_WARN_L1}"
                         "${NULL_ENTROPY_WARN_L2}"
                         "${NULL_ENTROPY_WARN_L3}"
                         "${WARNING_BORDER}")

find_package(Perl)
if(PERL_FOUND)

    # If NULL Entropy is configured, display an appropriate warning
    execute_process(COMMAND ${PERL_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/scripts/config.pl -f ${CMAKE_CURRENT_SOURCE_DIR}/include/mbedtls/config.h get MBEDTLS_TEST_NULL_ENTROPY
                        RESULT_VARIABLE result)
    if(${result} EQUAL 0)
        message(WARNING ${NULL_ENTROPY_WARNING})

        if(NOT UNSAFE_BUILD)
            message(FATAL_ERROR "\
\n\
Warning! You have enabled MBEDTLS_TEST_NULL_ENTROPY. \
This option is not safe for production use and negates all security \
It is intended for development use only. \
\n\
To confirm you want to build with this option, re-run cmake with the \
option: \n\
  cmake -DUNSAFE_BUILD=ON ")

            return()
        endif()
    endif()
endif()

set(CMAKE_BUILD_TYPE ${CMAKE_BUILD_TYPE}
    CACHE STRING "Choose the type of build: None Debug Release Coverage ASan ASanDbg MemSan MemSanDbg Check CheckFull"
    FORCE)

# Create a symbolic link from ${base_name} in the binary directory
# to the corresponding path in the source directory.
function(link_to_source base_name)
    # Get OS dependent path to use in `execute_process`
    file(TO_NATIVE_PATH "${CMAKE_CURRENT_BINARY_DIR}/${base_name}" link)
    file(TO_NATIVE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/${base_name}" target)

    if (NOT EXISTS ${link})
        if (CMAKE_HOST_UNIX)
            set(command ln -s ${target} ${link})
        else()
            if (IS_DIRECTORY ${target})
                set(command cmd.exe /c mklink /j ${link} ${target})
            else()
                set(command cmd.exe /c mklink /h ${link} ${target})
            endif()
        endif()

        execute_process(COMMAND ${command}
            RESULT_VARIABLE result
            ERROR_VARIABLE output)

        if (NOT ${result} EQUAL 0)
            message(FATAL_ERROR "Could not create symbolic link for: ${target} --> ${output}")
        endif()
    endif()
endfunction(link_to_source)

string(REGEX MATCH "Clang" CMAKE_COMPILER_IS_CLANG "${CMAKE_C_COMPILER_ID}")

if(CMAKE_COMPILER_IS_GNU)
    # some warnings we want are not available with old GCC versions
    # note: starting with CMake 2.8 we could use CMAKE_C_COMPILER_VERSION
    execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpversion
                    OUTPUT_VARIABLE GCC_VERSION)
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement -Wwrite-strings")
    if (GCC_VERSION VERSION_GREATER 4.5 OR GCC_VERSION VERSION_EQUAL 4.5)
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wlogical-op")
    endif()
    if (GCC_VERSION VERSION_GREATER 4.8 OR GCC_VERSION VERSION_EQUAL 4.8)
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wshadow")
    endif()
    set(CMAKE_C_FLAGS_RELEASE     "-O2")
    set(CMAKE_C_FLAGS_DEBUG       "-O0 -g3")
    set(CMAKE_C_FLAGS_COVERAGE    "-O0 -g3 --coverage")
    set(CMAKE_C_FLAGS_ASAN        "-Werror -fsanitize=address -fno-common -O3")
    set(CMAKE_C_FLAGS_ASANDBG     "-Werror -fsanitize=address -fno-common -O1 -g3 -fno-omit-frame-pointer -fno-optimize-sibling-calls ")
    set(CMAKE_C_FLAGS_CHECK       "-Werror -Os")
    set(CMAKE_C_FLAGS_CHECKFULL   "${CMAKE_C_FLAGS_CHECK} -Wcast-qual")
endif(CMAKE_COMPILER_IS_GNU)

if(CMAKE_COMPILER_IS_CLANG)
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement -Wwrite-strings -Wpointer-arith -Wimplicit-fallthrough -Wshadow")
    set(CMAKE_C_FLAGS_RELEASE     "-O2")
    set(CMAKE_C_FLAGS_DEBUG       "-O0 -g3")
    set(CMAKE_C_FLAGS_COVERAGE    "-O0 -g3 --coverage")
    set(CMAKE_C_FLAGS_ASAN        "-Werror -fsanitize=address -fno-common -fsanitize=undefined -fno-sanitize-recover=all -O3")
    set(CMAKE_C_FLAGS_ASANDBG     "-Werror -fsanitize=address -fno-common -fsanitize=undefined -fno-sanitize-recover=all -O1 -g3 -fno-omit-frame-pointer -fno-optimize-sibling-calls ")
    set(CMAKE_C_FLAGS_MEMSAN      "-Werror -fsanitize=memory -O3")
    set(CMAKE_C_FLAGS_MEMSANDBG   "-Werror -fsanitize=memory -O1 -g3 -fno-omit-frame-pointer -fno-optimize-sibling-calls -fsanitize-memory-track-origins=2")
    set(CMAKE_C_FLAGS_CHECK       "-Werror -Os")
endif(CMAKE_COMPILER_IS_CLANG)

if(CMAKE_COMPILER_IS_IAR)
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --warn_about_c_style_casts --warnings_are_errors -Ohz")
endif(CMAKE_COMPILER_IS_IAR)

if(CMAKE_COMPILER_IS_MSVC)
    # Strictest warnings, and treat as errors
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /W3")
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /WX")
endif(CMAKE_COMPILER_IS_MSVC)

if(CMAKE_BUILD_TYPE STREQUAL "Coverage")
    if(CMAKE_COMPILER_IS_GNU OR CMAKE_COMPILER_IS_CLANG)
        set(CMAKE_SHARED_LINKER_FLAGS "--coverage")
    endif(CMAKE_COMPILER_IS_GNU OR CMAKE_COMPILER_IS_CLANG)
endif(CMAKE_BUILD_TYPE STREQUAL "Coverage")

if(LIB_INSTALL_DIR)
else()
    set(LIB_INSTALL_DIR lib)
endif()

include_directories(include/)

if(ENABLE_ZLIB_SUPPORT)
    find_package(ZLIB)

    if(ZLIB_FOUND)
        include_directories(${ZLIB_INCLUDE_DIR})
    endif(ZLIB_FOUND)
endif(ENABLE_ZLIB_SUPPORT)

add_subdirectory(library)
add_subdirectory(include)

if(ENABLE_PROGRAMS)
    add_subdirectory(programs)
endif()

ADD_CUSTOM_TARGET(apidoc
    COMMAND doxygen mbedtls.doxyfile
    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/doxygen)

if(ENABLE_TESTING)
    enable_testing()

    add_subdirectory(tests)

    # additional convenience targets for Unix only
    if(UNIX)

        ADD_CUSTOM_TARGET(covtest
            COMMAND make test
            COMMAND programs/test/selftest
            COMMAND tests/compat.sh
            COMMAND tests/ssl-opt.sh
        )

        ADD_CUSTOM_TARGET(lcov
            COMMAND rm -rf Coverage
            COMMAND lcov --capture --initial --directory library/CMakeFiles/mbedtls.dir -o files.info
            COMMAND lcov --capture --directory library/CMakeFiles/mbedtls.dir -o tests.info
            COMMAND lcov --add-tracefile files.info --add-tracefile tests.info -o all.info
            COMMAND lcov --remove all.info -o final.info '*.h'
            COMMAND gendesc tests/Descriptions.txt -o descriptions
            COMMAND genhtml --title "mbed TLS" --description-file descriptions --keep-descriptions --legend --no-branch-coverage -o Coverage final.info
            COMMAND rm -f files.info tests.info all.info final.info descriptions
        )

        ADD_CUSTOM_TARGET(memcheck
            COMMAND sed -i.bak s+/usr/bin/valgrind+`which valgrind`+ DartConfiguration.tcl
            COMMAND ctest -O memcheck.log -D ExperimentalMemCheck
            COMMAND tail -n1 memcheck.log | grep 'Memory checking results:' > /dev/null
            COMMAND rm -f memcheck.log
            COMMAND mv DartConfiguration.tcl.bak DartConfiguration.tcl
        )
    endif(UNIX)
endif()

# Make scripts needed for testing available in an out-of-source build.
if (NOT ${CMAKE_CURRENT_BINARY_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
    link_to_source(scripts)
    # Copy (don't link) DartConfiguration.tcl, needed for memcheck, to
    # keep things simple with the sed commands in the memcheck target.
    configure_file(${CMAKE_CURRENT_SOURCE_DIR}/DartConfiguration.tcl
                   ${CMAKE_CURRENT_BINARY_DIR}/DartConfiguration.tcl COPYONLY)
endif()