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cxx/CMakeLists.txt
Eric Fiselier 9071bc098b [libcxx] Add support for building and testing with an ABI library not along linker paths 
Summary:
This patch adds support for building/testing libc++ with an ABI library that the linker would not normally find.

- `CMAKE_LIBRARY_PATH` is used to specify the list of search directories.
- The ABI library is now found using `find_library` instead of assuming its along the linker's search path.
- `CMAKE_LIBRARY_PATH` is passed to our LIT config as `library_paths`.
- For each path in `library_paths` the following flags are added `-L<path> -Wl,-rpath -Wl,<path>`

Some changes in existing behavior were also added:
- `target_link_libraries` is now passed the ABI library file instead of the library name. Ex `target_link_libraries(cxx "/usr/lib/libc++abi.so")` vs `target_link_libraries(cxx "c++abi")`.
- `-Wl,-rpath -Wl,<path>` is now used on OSX to link to libc++ instead of env['DYLD_LIBRARY_PATH'] if `use_system_lib=False`.




Reviewers: mclow.lists, danalbert, EricWF

Reviewed By: EricWF

Subscribers: emaste, cfe-commits

Differential Revision: http://reviews.llvm.org/D5038

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@220118 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-18 01:15:17 +00:00

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# 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/${PROJECT_NAME} [options]' there."
)
if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
set(LIBCXX_BUILT_STANDALONE 1)
endif()
#===============================================================================
# Setup CMake Options
#===============================================================================
# Define options.
option(LIBCXX_ENABLE_EXCEPTIONS "Use exceptions." ON)
option(LIBCXX_ENABLE_RTTI "Use run time type information." ON)
option(LIBCXX_ENABLE_ASSERTIONS "Enable assertions independent of build mode." ON)
option(LIBCXX_ENABLE_PEDANTIC "Compile with pedantic enabled." ON)
option(LIBCXX_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF)
option(LIBCXX_ENABLE_CXX1Y "Enable -std=c++1y and use of c++1y language features if the compiler supports it." OFF)
option(LIBCXX_ENABLE_SHARED "Build libc++ as a shared library." ON)
option(LIBCXX_INSTALL_SUPPORT_HEADERS "Install libc++ support headers." ON)
if (LIBCXX_BUILT_STANDALONE)
set(LLVM_USE_SANITIZER "" CACHE STRING
"Define the sanitizer used to build the library and tests")
endif()
set(CXXABIS none libcxxabi libcxxrt libstdc++ libsupc++)
if (NOT LIBCXX_CXX_ABI)
if (NOT DEFINED LIBCXX_BUILT_STANDALONE AND
IS_DIRECTORY "${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 ${LIBCXX_TARGET_TRIPLE} CACHE STRING "Target triple.")
# Configure compiler.
include(config-ix)
# Configure ABI library
include(HandleLibCXXABI)
#===============================================================================
# Setup Compiler Flags
#===============================================================================
# Get required flags.
# On all systems the system c++ standard library headers need to be excluded.
if (MSVC)
# MSVC only has -X, which disables all default includes; including the crt.
# Thus, we do nothing and hope we don't accidentally include any of the C++
# headers.
else()
if (LIBCXX_HAS_NOSTDINCXX_FLAG)
list(APPEND LIBCXX_CXX_REQUIRED_FLAGS -nostdinc++)
string(REPLACE "-stdlib=libc++" "" CMAKE_CXX_FLAGS "${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_REQUIRED_FLAGS "-std=${LIBCXX_STD_VERSION}")
endif()
macro(append_if list condition var)
if (${condition})
list(APPEND ${list} ${var})
endif()
endmacro()
# Get warning flags
if (NOT MSVC)
append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WALL_FLAG -Wall)
list(APPEND LIBCXX_CXX_REQUIRED_FLAGS -Werror=return-type)
endif()
append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_W_FLAG -W)
append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WNO_UNUSED_PARAMETER_FLAG -Wno-unused-parameter)
append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WWRITE_STRINGS_FLAG -Wwrite-strings)
append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WNO_LONG_LONG_FLAG -Wno-long-long)
if (LIBCXX_ENABLE_WERROR)
append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WERROR_FLAG -Werror)
append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WX_FLAG -WX)
else()
append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WNO_ERROR_FLAG -Wno-error)
append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_NO_WX_FLAG -WX-)
endif()
if (LIBCXX_ENABLE_PEDANTIC)
append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_PEDANTIC_FLAG -pedantic)
endif()
# Get feature flags.
# Exceptions
if (LIBCXX_ENABLE_EXCEPTIONS)
# Catches C++ exceptions only and tells the compiler to assume that extern C
# functions never throw a C++ exception.
append_if(LIBCXX_CXX_FEATURE_FLAGS LIBCXX_HAS_EHSC_FLAG -EHsc)
else()
list(APPEND LIBCXX_CXX_FEATURE_FLAGS -D_LIBCPP_NO_EXCEPTIONS)
append_if(LIBCXX_CXX_FEATURE_FLAGS LIBCXX_HAS_NO_EHS_FLAG -EHs-)
append_if(LIBCXX_CXX_FEATURE_FLAGS LIBCXX_HAS_NO_EHA_FLAG -EHa-)
append_if(LIBCXX_CXX_FEATURE_FLAGS LIBCXX_HAS_FNO_EXCEPTIONS_FLAG -fno-exceptions)
endif()
# RTTI
if (NOT LIBCXX_ENABLE_RTTI)
list(APPEND LIBCXX_CXX_FEATURE_FLAGS -D_LIBCPP_NO_RTTI)
append_if(LIBCXX_CXX_FEATURE_FLAGS LIBCXX_HAS_NO_GR_FLAG -GR-)
append_if(LIBCXX_CXX_FEATURE_FLAGS LIBCXX_HAS_FNO_RTTI_FLAG -fno-rtti)
endif()
# Assert
string(TOUPPER "${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_CXX_FEATURE_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_CXX_FEATURE_FLAGS -UNDEBUG)
endif()
else()
if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE")
list(APPEND LIBCXX_CXX_FEATURE_FLAGS -DNDEBUG)
endif()
endif()
# Static library
if (NOT LIBCXX_ENABLE_SHARED)
list(APPEND LIBCXX_CXX_FEATURE_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()
# 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_FEATURE_FLAGS LIBCXX_HAS_NO_OMIT_FRAME_POINTER_FLAG
"-fno-omit-frame-pointer")
if (LLVM_USE_SANITIZER STREQUAL "Address")
list(APPEND LIBCXX_CXX_FEATURE_FLAGS "-fsanitize=address")
elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?")
list(APPEND LIBCXX_CXX_FEATURE_FLAGS "-fsanitize=memory")
if (LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins")
list(APPEND LIBCXX_CXX_FEATURE_FLAGS "-fsanitize-memory-track-origins")
endif()
elseif (LLVM_USE_SANITIZER STREQUAL "Undefined")
list(APPEND LIBCXX_CXX_FEATURE_FLAGS
"-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover")
else()
message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}")
endif()
elseif(MSVC)
message(WARNING "LLVM_USE_SANITIZER is not supported with MSVC")
endif()
endif()
string(REPLACE ";" " " LIBCXX_CXX_REQUIRED_FLAGS "${LIBCXX_CXX_REQUIRED_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LIBCXX_CXX_REQUIRED_FLAGS}")
string(REPLACE ";" " " LIBCXX_CXX_WARNING_FLAGS "${LIBCXX_CXX_WARNING_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LIBCXX_CXX_WARNING_FLAGS}")
string(REPLACE ";" " " LIBCXX_CXX_FEATURE_FLAGS "${LIBCXX_CXX_FEATURE_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LIBCXX_CXX_FEATURE_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)
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