CMakeLists.txt

# See www/CMake.html for instructions on how to build libcxx with CMake.

#===============================================================================
# Setup Project
#===============================================================================

project(libcxx CXX C)
cmake_minimum_required(VERSION 2.8)

set(PACKAGE_NAME libcxx)
set(PACKAGE_VERSION trunk-svn)
set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
set(PACKAGE_BUGREPORT "llvmbugs@cs.uiuc.edu")

# Add path for custom modules
set(CMAKE_MODULE_PATH
 "${CMAKE_CURRENT_SOURCE_DIR}/cmake"
 "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules"
 ${CMAKE_MODULE_PATH}
 )

# Require out of source build.
include(MacroEnsureOutOfSourceBuild)
MACRO_ENSURE_OUT_OF_SOURCE_BUILD(
 "${PROJECT_NAME} requires an out of source build. Please create a separate
 build directory and run 'cmake /path/to/${PROJECT_NAME} [options]' there."
 )

if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
 set(LIBCXX_BUILT_STANDALONE 1)
endif()

#===============================================================================
# Setup CMake Options
#===============================================================================

# Define options.
option(LIBCXX_ENABLE_EXCEPTIONS "Use exceptions." ON)
option(LIBCXX_ENABLE_RTTI "Use run time type information." ON)
option(LIBCXX_ENABLE_ASSERTIONS "Enable assertions independent of build mode." ON)
option(LIBCXX_ENABLE_PEDANTIC "Compile with pedantic enabled." ON)
option(LIBCXX_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF)
option(LIBCXX_ENABLE_CXX1Y "Enable -std=c++1y and use of c++1y language features if the compiler supports it." OFF)
option(LIBCXX_ENABLE_SHARED "Build libc++ as a shared library." ON)
option(LIBCXX_ENABLE_THREADS "Build libc++ with support for threads." ON)
option(LIBCXX_ENABLE_MONOTONIC_CLOCK
 "Build libc++ with support for a monotonic clock.
 This option may only be used when LIBCXX_ENABLE_THREADS=OFF." ON)
option(LIBCXX_INSTALL_SUPPORT_HEADERS "Install libc++ support headers." ON)
if (LIBCXX_BUILT_STANDALONE)
 set(LLVM_USE_SANITIZER "" CACHE STRING
 "Define the sanitizer used to build the library and tests")
endif()

set(CXXABIS none libcxxabi libcxxrt libstdc++ libsupc++)
if (NOT LIBCXX_CXX_ABI)
 if (NOT DEFINED LIBCXX_BUILT_STANDALONE AND
 IS_DIRECTORY "${CMAKE_SOURCE_DIR}/projects/libcxxabi")
 set(LIBCXX_CXX_ABI_LIBNAME "libcxxabi")
 set(LIBCXX_LIBCXXABI_INCLUDE_PATHS "${CMAKE_SOURCE_DIR}/projects/libcxxabi/include")
 set(LIBCXX_CXX_ABI_INTREE 1)
 else ()
 set(LIBCXX_CXX_ABI_LIBNAME "none")
 endif ()
else ()
 set(LIBCXX_CXX_ABI_LIBNAME "${LIBCXX_CXX_ABI}")
endif ()
set(LIBCXX_CXX_ABI "${LIBCXX_CXX_ABI}" CACHE STRING
 "Specify C++ ABI library to use." FORCE)
set_property(CACHE LIBCXX_CXX_ABI PROPERTY STRINGS ;${CXXABIS})

#===============================================================================
# Configure System
#===============================================================================

# Get triples.
include(GetTriple)
get_host_triple(LIBCXX_HOST_TRIPLE
 LIBCXX_HOST_ARCH
 LIBCXX_HOST_VENDOR
 LIBCXX_HOST_OS
 )
set(LIBCXX_HOST_TRIPLE ${LIBCXX_HOST_TRIPLE} CACHE STRING "Host triple.")
get_target_triple(LIBCXX_TARGET_TRIPLE
 LIBCXX_TARGET_ARCH
 LIBCXX_TARGET_VENDOR
 LIBCXX_TARGET_OS
 )
set(LIBCXX_TARGET_TRIPLE ${LIBCXX_TARGET_TRIPLE} CACHE STRING "Target triple.")


# Declare libc++ configuration variables.
# They are intended for use as follows:
# LIBCXX_CXX_FLAGS: General flags for both the compiler and linker.
# LIBCXX_COMPILE_FLAGS: Compile only flags.
# LIBCXX_LINK_FLAGS: Linker only flags.
set(LIBCXX_CXX_FLAGS "")
set(LIBCXX_COMPILE_FLAGS "")
set(LIBCXX_LINK_FLAGS "")

# Configure compiler.
include(config-ix)
# Configure ABI library
include(HandleLibCXXABI)

#===============================================================================
# Setup Compiler Flags
#===============================================================================

# Get required flags.
# On all systems the system c++ standard library headers need to be excluded.
if (MSVC)
 # MSVC only has -X, which disables all default includes; including the crt.
 # Thus, we do nothing and hope we don't accidentally include any of the C++
 # headers.
else()
 if (LIBCXX_HAS_NOSTDINCXX_FLAG)
 list(APPEND LIBCXX_COMPILE_FLAGS -nostdinc++)
 string(REPLACE "-stdlib=libc++" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
 string(REPLACE "-stdlib=libstdc++" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
 endif()
 # If c++1y has been enabled then attempt to use it. Fail if it is no supported
 # by the compiler. Otherwise choose c++11 and ensure the compiler supports it.
 if (LIBCXX_ENABLE_CXX1Y)
 if (LIBCXX_HAS_STDCXX1Y_FLAG)
 set(LIBCXX_STD_VERSION c++1y)
 else()
 message(FATAL_ERROR "c++1y was enabled but the compiler does not support it.")
 endif()
 else()
 if (LIBCXX_HAS_STDCXX11_FLAG)
 set(LIBCXX_STD_VERSION c++11)
 else()
 message(FATAL_ERROR "c++11 is required by libc++ but is not supported by the compiler")
 endif()
 endif()
 # LIBCXX_STD_VERSION should always be set at this point.
 list(APPEND LIBCXX_CXX_FLAGS "-std=${LIBCXX_STD_VERSION}")
endif()

macro(append_if list condition var)
 if (${condition})
 list(APPEND ${list} ${var})
 endif()
endmacro()

# Get warning flags
if (NOT MSVC)
 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_WALL_FLAG -Wall)
 list(APPEND LIBCXX_COMPILE_FLAGS -Werror=return-type)
endif()

append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_W_FLAG -W)
append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_WNO_UNUSED_PARAMETER_FLAG -Wno-unused-parameter)
append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_WWRITE_STRINGS_FLAG -Wwrite-strings)
append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_WNO_LONG_LONG_FLAG -Wno-long-long)
if (LIBCXX_ENABLE_WERROR)
 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_WERROR_FLAG -Werror)
 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_WX_FLAG -WX)
else()
 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_WNO_ERROR_FLAG -Wno-error)
 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_NO_WX_FLAG -WX-)
endif()
if (LIBCXX_ENABLE_PEDANTIC)
 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_PEDANTIC_FLAG -pedantic)
endif()

# Get feature flags.
# Exceptions
if (LIBCXX_ENABLE_EXCEPTIONS)
 # Catches C++ exceptions only and tells the compiler to assume that extern C
 # functions never throw a C++ exception.
 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_EHSC_FLAG -EHsc)
else()
 list(APPEND LIBCXX_CXX_FLAGS -D_LIBCPP_NO_EXCEPTIONS)
 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_NO_EHS_FLAG -EHs-)
 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_NO_EHA_FLAG -EHa-)
 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_FNO_EXCEPTIONS_FLAG -fno-exceptions)
endif()
# RTTI
if (NOT LIBCXX_ENABLE_RTTI)
 list(APPEND LIBCXX_CXX_FLAGS -D_LIBCPP_NO_RTTI)
 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_NO_GR_FLAG -GR-)
 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_FNO_RTTI_FLAG -fno-rtti)
endif()
# Assert
string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
if (LIBCXX_ENABLE_ASSERTIONS)
 # MSVC doesn't like _DEBUG on release builds. See PR 4379.
 if (NOT MSVC)
 list(APPEND LIBCXX_COMPILE_FLAGS -D_DEBUG)
 endif()
 # On Release builds cmake automatically defines NDEBUG, so we
 # explicitly undefine it:
 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE")
 list(APPEND LIBCXX_COMPILE_FLAGS -UNDEBUG)
 endif()
else()
 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE")
 list(APPEND LIBCXX_COMPILE_FLAGS -DNDEBUG)
 endif()
endif()
# Static library
if (NOT LIBCXX_ENABLE_SHARED)
 list(APPEND LIBCXX_COMPILE_FLAGS -D_LIBCPP_BUILD_STATIC)
endif()

# This is the _ONLY_ place where add_definitions is called.
if (MSVC)
 add_definitions(-D_CRT_SECURE_NO_WARNINGS)
endif()

# LIBCXX_ENABLE_THREADS configuration
if (NOT LIBCXX_ENABLE_THREADS)
 add_definitions(-D_LIBCPP_HAS_NO_THREADS)
 if (NOT LIBCXX_ENABLE_MONOTONIC_CLOCK)
 add_definitions(-D_LIBCPP_HAS_NO_MONOTONIC_CLOCK)
 endif()
# Ensure LIBCXX_ENABLE_MONOTONIC_CLOCK is set to ON.
elseif(NOT LIBCXX_ENABLE_MONOTONIC_CLOCK)
 message(FATAL_ERROR "LIBCXX_ENABLE_MONOTONIC_CLOCK can only be set to OFF"
 " when LIBCXX_ENABLE_THREADS is also set to OFF.")
endif()

# Configure for sanitizers. If LIBCXX_BUILT_STANDALONE then we have to do
# the flag translation ourselves. Othewise LLVM's CMakeList.txt will handle it.
if (LIBCXX_BUILT_STANDALONE)
 # NOTE: LLVM_USE_SANITIZER checks for a UNIX like system instead of MSVC.
 # But we don't have LLVM_ON_UNIX so checking for MSVC is the best we can do.
 if (LLVM_USE_SANITIZER AND NOT MSVC)
 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_FNO_OMIT_FRAME_POINTER_FLAG
 "-fno-omit-frame-pointer")
 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND
 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")
 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_GLINE_TABLES_ONLY_FLAG
 "-gline-tables-only")
 endif()
 if (LLVM_USE_SANITIZER STREQUAL "Address")
 list(APPEND LIBCXX_CXX_FLAGS "-fsanitize=address")
 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?")
 list(APPEND LIBCXX_CXX_FLAGS "-fsanitize=memory")
 if (LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins")
 list(APPEND LIBCXX_CXX_FLAGS "-fsanitize-memory-track-origins")
 endif()
 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined")
 list(APPEND LIBCXX_CXX_FLAGS
 "-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover")
 elseif (LLVM_USE_SANITIZER STREQUAL "Thread")
 list(APPEND LIBCXX_CXX_FLAGS "-fsanitize=thread")
 else()
 message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}")
 endif()
 elseif(MSVC)
 message(WARNING "LLVM_USE_SANITIZER is not supported with MSVC")
 endif()
endif()

string(REPLACE ";" " " LIBCXX_CXX_FLAGS "${LIBCXX_CXX_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LIBCXX_CXX_FLAGS}")

#===============================================================================
# Setup Source Code
#===============================================================================

include_directories(include)
add_subdirectory(include)

# Add source code. This also contains all of the logic for deciding linker flags
# soname, etc...
add_subdirectory(lib)

#===============================================================================
# Setup Tests
#===============================================================================

add_subdirectory(test)