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# Configures C++14 compiler, setting TDLib-specific compilation options.
function(td_set_up_compiler)
set(CMAKE_EXPORT_COMPILE_COMMANDS 1 PARENT_SCOPE)
set(CMAKE_POSITION_INDEPENDENT_CODE ON PARENT_SCOPE)
include(illumos)
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
set(GCC 1)
set(GCC 1 PARENT_SCOPE)
elseif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
set(CLANG 1)
set(CLANG 1 PARENT_SCOPE)
elseif (CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
set(INTEL 1)
set(INTEL 1 PARENT_SCOPE)
elseif (NOT MSVC)
message(FATAL_ERROR "Compiler isn't supported")
endif()
include(CheckCXXCompilerFlag)
if (GCC OR CLANG OR INTEL)
if (WIN32 AND INTEL)
set(STD14_FLAG /Qstd=c++14)
else()
set(STD14_FLAG -std=c++14)
endif()
check_cxx_compiler_flag(${STD14_FLAG} HAVE_STD14)
if (NOT HAVE_STD14)
string(REPLACE "c++14" "c++1y" STD14_FLAG "${STD14_FLAG}")
check_cxx_compiler_flag(${STD14_FLAG} HAVE_STD1Y)
set(HAVE_STD14 ${HAVE_STD1Y})
endif()
elseif (MSVC)
set(HAVE_STD14 MSVC_VERSION>=1900)
endif()
if (NOT HAVE_STD14)
message(FATAL_ERROR "No C++14 support in the compiler. Please upgrade the compiler.")
endif()
if (MSVC)
if (CMAKE_CXX_FLAGS_DEBUG MATCHES "/RTC1")
string(REPLACE "/RTC1" " " CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
endif()
add_definitions(-D_SCL_SECURE_NO_WARNINGS -D_CRT_SECURE_NO_WARNINGS)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /utf-8 /GR- /W4 /wd4100 /wd4127 /wd4324 /wd4505 /wd4814 /wd4702 /bigobj")
elseif (CLANG OR GCC)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${STD14_FLAG} -fno-omit-frame-pointer -fno-exceptions -fno-rtti")
if (APPLE)
set(TD_LINKER_FLAGS "-Wl,-dead_strip")
if (NOT CMAKE_BUILD_TYPE MATCHES "Deb")
set(TD_LINKER_FLAGS "${TD_LINKER_FLAGS},-x,-S")
endif()
else()
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -ffunction-sections -fdata-sections")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ffunction-sections -fdata-sections")
if (CMAKE_SYSTEM_NAME STREQUAL "SunOS")
set(TD_LINKER_FLAGS "-Wl,-z,ignore")
elseif (EMSCRIPTEN)
set(TD_LINKER_FLAGS "-Wl,--gc-sections")
elseif (ANDROID)
set(TD_LINKER_FLAGS "-Wl,--gc-sections -Wl,--exclude-libs,ALL -Wl,--icf=safe")
else()
set(TD_LINKER_FLAGS "-Wl,--gc-sections -Wl,--exclude-libs,ALL")
endif()
endif()
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${TD_LINKER_FLAGS}")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${TD_LINKER_FLAGS}")
if (WIN32 OR CYGWIN)
if (GCC)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wa,-mbig-obj")
endif()
endif()
elseif (INTEL)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${STD14_FLAG}")
endif()
if (WIN32)
add_definitions(-DNTDDI_VERSION=0x06020000 -DWINVER=0x0602 -D_WIN32_WINNT=0x0602 -DPSAPI_VERSION=1 -DNOMINMAX -DUNICODE -D_UNICODE -DWIN32_LEAN_AND_MEAN)
endif()
if (CYGWIN)
add_definitions(-D_DEFAULT_SOURCE=1 -DFD_SETSIZE=4096)
endif()
# _FILE_OFFSET_BITS is broken in Android NDK r15, r15b and r17 and doesn't work prior to Android 7.0
add_definitions(-D_FILE_OFFSET_BITS=64)
# _GNU_SOURCE might not be defined by g++
add_definitions(-D_GNU_SOURCE)
if (CMAKE_SYSTEM_NAME STREQUAL "SunOS")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lsocket -lnsl")
if (ILLUMOS)
add_definitions(-DTD_ILLUMOS=1)
endif()
endif()
include(AddCXXCompilerFlag)
if (NOT MSVC)
add_cxx_compiler_flag("-Wall")
add_cxx_compiler_flag("-Wextra")
add_cxx_compiler_flag("-Wimplicit-fallthrough=2")
add_cxx_compiler_flag("-Wpointer-arith")
add_cxx_compiler_flag("-Wcast-qual")
add_cxx_compiler_flag("-Wsign-compare")
add_cxx_compiler_flag("-Wduplicated-branches")
add_cxx_compiler_flag("-Wduplicated-cond")
add_cxx_compiler_flag("-Walloc-zero")
add_cxx_compiler_flag("-Wlogical-op")
add_cxx_compiler_flag("-Wno-tautological-compare")
add_cxx_compiler_flag("-Wpointer-arith")
add_cxx_compiler_flag("-Wvla")
add_cxx_compiler_flag("-Wnon-virtual-dtor")
add_cxx_compiler_flag("-Wno-unused-parameter")
add_cxx_compiler_flag("-Wconversion")
add_cxx_compiler_flag("-Wno-sign-conversion")
add_cxx_compiler_flag("-Wc++14-compat-pedantic")
add_cxx_compiler_flag("-Wdeprecated")
add_cxx_compiler_flag("-Wno-unused-command-line-argument")
add_cxx_compiler_flag("-Qunused-arguments")
add_cxx_compiler_flag("-Wno-unknown-warning-option")
add_cxx_compiler_flag("-Wodr")
add_cxx_compiler_flag("-flto-odr-type-merging")
add_cxx_compiler_flag("-Wno-psabi")
add_cxx_compiler_flag("-Wunused-member-function")
add_cxx_compiler_flag("-Wunused-private-field")
# add_cxx_compiler_flag("-Werror")
# add_cxx_compiler_flag("-Wcast-align")
#std::int32_t <-> int and off_t <-> std::size_t/std::int64_t
# add_cxx_compiler_flag("-Wuseless-cast")
#external headers like openssl
# add_cxx_compiler_flag("-Wzero-as-null-pointer-constant")
endif()
if (GCC)
add_cxx_compiler_flag("-Wno-maybe-uninitialized") # too many false positives
endif()
if (WIN32 AND GCC AND NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.0))
# warns about casts of function pointers returned by GetProcAddress
add_cxx_compiler_flag("-Wno-cast-function-type")
endif()
if (GCC AND NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0))
# warns about a lot of "return std::move", which are not redundant for compilers without fix for DR 1579, i.e. GCC 4.9 or clang 3.8
# see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1579
add_cxx_compiler_flag("-Wno-redundant-move")
endif()
if (GCC AND NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 12.0))
add_cxx_compiler_flag("-Wno-stringop-overflow") # some false positives
endif()
if (CLANG AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.5))
# https://stackoverflow.com/questions/26744556/warning-returning-a-captured-reference-from-a-lambda
add_cxx_compiler_flag("-Wno-return-stack-address")
endif()
if (GCC AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 13.0))
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104030
add_cxx_compiler_flag("-Wbidi-chars=none")
endif()
if (MINGW)
add_cxx_compiler_flag("-ftrack-macro-expansion=0")
endif()
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -isystem /usr/include/c++/v1")
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=thread")
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address")
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=undefined")
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=leak")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" PARENT_SCOPE)
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}" PARENT_SCOPE)
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}" PARENT_SCOPE)
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}" PARENT_SCOPE)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" PARENT_SCOPE)
endfunction()
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