# nghttp3
#
# Copyright (c) 2019 nghttp3 contributors
# Copyright (c) 2016 ngtcp2 contributors
# Copyright (c) 2012 nghttp2 contributors
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

cmake_minimum_required(VERSION 3.20)
# XXX using 0.1.90 instead of 0.2.0-DEV
project(nghttp3 VERSION 1.11.90 LANGUAGES C)

# See versioning rule:
#  https://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
set(LT_CURRENT  12)
set(LT_REVISION 0)
set(LT_AGE      3)

set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
include(Version)

math(EXPR LT_SOVERSION "${LT_CURRENT} - ${LT_AGE}")
set(LT_VERSION "${LT_SOVERSION}.${LT_AGE}.${LT_REVISION}")
set(PACKAGE_VERSION     "${PROJECT_VERSION}")
HexVersion(PACKAGE_VERSION_NUM ${PROJECT_VERSION_MAJOR} ${PROJECT_VERSION_MINOR} ${PROJECT_VERSION_PATCH})

if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
  set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "Choose the build type" FORCE)

  # Include "None" as option to disable any additional (optimization) flags,
  # relying on just CMAKE_C_FLAGS and CMAKE_CXX_FLAGS (which are empty by
  # default). These strings are presented in cmake-gui.
  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
    "None" "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
endif()

include(GNUInstallDirs)
include(CMakeDependentOption)

include(CMakeOptions.txt)

# Do not disable assertions based on CMAKE_BUILD_TYPE.
foreach(_build_type "Release" "MinSizeRel" "RelWithDebInfo")
  foreach(_lang C CXX)
    string(TOUPPER "CMAKE_${_lang}_FLAGS_${_build_type}" _var)
    string(REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " " ${_var} "${${_var}}")
  endforeach()
endforeach()

enable_testing()
add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND})

# Checks for header files.
include(CheckIncludeFile)
check_include_file("arpa/inet.h"   HAVE_ARPA_INET_H)
check_include_file("unistd.h"      HAVE_UNISTD_H)
check_include_file("sys/endian.h"  HAVE_SYS_ENDIAN_H)
check_include_file("endian.h"      HAVE_ENDIAN_H)
check_include_file("byteswap.h"    HAVE_BYTESWAP_H)

include(CheckTypeSize)
# Checks for typedefs, structures, and compiler characteristics.
# AC_TYPE_SIZE_T
check_type_size("ssize_t" SIZEOF_SSIZE_T)
if(SIZEOF_SSIZE_T STREQUAL "")
  # ssize_t is a signed type in POSIX storing at least -1.
  # Set it to a pointer-size int.
  set(ssize_t ptrdiff_t)
endif()

# Checks for symbols.
include(CheckSymbolExists)
if(HAVE_ENDIAN_H)
  check_symbol_exists(be64toh "endian.h" HAVE_DECL_BE64TOH)
endif()
if(NOT HAVE_DECL_BE64TOH AND HAVE_SYS_ENDIAN_H)
  check_symbol_exists(be64toh "sys/endian.h" HAVE_DECL_BE64TOH)
endif()

check_symbol_exists(bswap_64 "byteswap.h" HAVE_DECL_BSWAP_64)

if(${CMAKE_C_BYTE_ORDER} STREQUAL "BIG_ENDIAN")
  set(WORDS_BIGENDIAN 1)
endif()

set(WARNCFLAGS)
set(WARNCXXFLAGS)
if(CMAKE_C_COMPILER_ID MATCHES "MSVC")
  if(CMAKE_C_COMPILER_ARCHITECTURE_ID MATCHES "x64")
    set(CMAKE_C_FLAGS "/guard:ehcont ${CMAKE_C_FLAGS}")
  endif()
  if(CMAKE_CXX_COMPILER_ARCHITECTURE_ID MATCHES "x64")
    set(CMAKE_CXX_FLAGS "/guard:ehcont ${CMAKE_CXX_FLAGS}")
  endif()

  if(ENABLE_WERROR)
    set(WARNCFLAGS    /WX)
    set(WARNCXXFLAGS  /WX)
  endif()
else()
  if(ENABLE_WERROR)
    set(WARNCFLAGS   "-Werror")
    set(WARNCXXFLAGS "-Werror")
  endif()

  include(cmake/PickyWarningsC.cmake)
  include(cmake/PickyWarningsCXX.cmake)

  if(ENABLE_ASAN)
    include(CMakePushCheckState)
    include(CheckCCompilerFlag)
    cmake_push_check_state()
    set(CMAKE_REQUIRED_LIBRARIES "-fsanitize=address")
    check_c_compiler_flag(-fsanitize=address C__fsanitize_address_VALID)
    if(ENABLE_LIB_ONLY)
      # Bypass C++-specific check for lib-only builds where C++ is not enabled.
      set(CXX__fsanitize_address_VALID TRUE)
    else()
      check_cxx_compiler_flag(-fsanitize=address CXX__fsanitize_address_VALID)
    endif()
    cmake_pop_check_state()
    if(NOT C__fsanitize_address_VALID OR NOT CXX__fsanitize_address_VALID)
      message(WARNING "ENABLE_ASAN was requested, but not supported!")
    else()
      set(CMAKE_C_FLAGS "-fsanitize=address ${CMAKE_C_FLAGS}")
      set(CMAKE_CXX_FLAGS "-fsanitize=address ${CMAKE_CXX_FLAGS}")
    endif()
  endif()
endif()

if(ENABLE_STATIC_CRT)
  set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
endif()

if(ENABLE_DEBUG)
  set(DEBUGBUILD 1)
endif()

if(ENABLE_LIB_ONLY)
  set(ENABLE_EXAMPLES 0)
else()
  enable_language(CXX)
  set(ENABLE_EXAMPLES 1)
endif()

add_definitions(-DHAVE_CONFIG_H)
configure_file(cmakeconfig.h.in config.h)
# autotools-compatible names
# Sphinx expects relative paths in the .rst files. Use the fact that the files
# below are all one directory level deep.
file(RELATIVE_PATH top_srcdir   "${CMAKE_CURRENT_BINARY_DIR}/dir" "${CMAKE_CURRENT_SOURCE_DIR}")
file(RELATIVE_PATH top_builddir "${CMAKE_CURRENT_BINARY_DIR}/dir" "${CMAKE_CURRENT_BINARY_DIR}")
set(abs_top_srcdir  "${CMAKE_CURRENT_SOURCE_DIR}")
set(abs_top_builddir "${CMAKE_CURRENT_BINARY_DIR}")
# libnghttp3.pc (pkg-config file)
set(prefix          "${CMAKE_INSTALL_PREFIX}")
set(exec_prefix     "${CMAKE_INSTALL_PREFIX}")
set(libdir          "${CMAKE_INSTALL_FULL_LIBDIR}")
set(includedir      "${CMAKE_INSTALL_FULL_INCLUDEDIR}")
set(VERSION         "${PACKAGE_VERSION}")
# For init scripts and systemd service file (in contrib/)
set(bindir          "${CMAKE_INSTALL_FULL_BINDIR}")
set(sbindir         "${CMAKE_INSTALL_FULL_SBINDIR}")
foreach(name
  lib/libnghttp3.pc
  lib/includes/nghttp3/version.h
)
  configure_file("${name}.in" "${name}" @ONLY)
endforeach()

if(NOT ENABLE_POPCNT)
  add_definitions(-DDISABLE_POPCNT)
endif()

if(ENABLE_SHARED_LIB AND ENABLE_STATIC_LIB AND MSVC AND NOT STATIC_LIB_SUFFIX)
  set(STATIC_LIB_SUFFIX "_static")
endif()

include_directories(
  "${CMAKE_CURRENT_BINARY_DIR}" # for config.h
)
# For use in src/CMakeLists.txt
set(PKGDATADIR "${CMAKE_INSTALL_FULL_DATADIR}/${CMAKE_PROJECT_NAME}")

install(FILES README.rst DESTINATION "${CMAKE_INSTALL_DOCDIR}")

add_subdirectory(lib)
if(BUILD_TESTING)
  add_subdirectory(tests)
endif()
add_subdirectory(examples)


string(TOUPPER "${CMAKE_BUILD_TYPE}" _build_type)
message(STATUS "summary of build options:

    Package version: ${VERSION}
    Library version: ${LT_CURRENT}:${LT_REVISION}:${LT_AGE}
    Install prefix:  ${CMAKE_INSTALL_PREFIX}
    Target system:   ${CMAKE_SYSTEM_NAME}
    Compiler:
      Build type:     ${CMAKE_BUILD_TYPE}
      C compiler:     ${CMAKE_C_COMPILER}
      CFLAGS:         ${CMAKE_C_FLAGS_${_build_type}} ${CMAKE_C_FLAGS}
      C++ compiler:   ${CMAKE_CXX_COMPILER}
      CXXFLAGS:       ${CMAKE_CXX_FLAGS_${_build_type}} ${CMAKE_CXX_FLAGS}
      WARNCFLAGS:     ${WARNCFLAGS}
      WARNCXXFLAGS:   ${WARNCXXFLAGS}
    SIMD instruction:
      Enable popcnt:  ${ENABLE_POPCNT}
    Library:
      Shared:         ${ENABLE_SHARED_LIB}
      Static:         ${ENABLE_STATIC_LIB}
    Test:
      Build Test:     ${BUILD_TESTING}
    Library only:     ${ENABLE_LIB_ONLY}
    Examples:         ${ENABLE_EXAMPLES}
")