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ceres-solver/cmake/iOS.cmake
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Alex Stewart 799fd50192 Ensure host-built packages are not used when building for iOS. 
- Add missing CMAKE_FIND_ROOT_PATH_MODE_PACKAGE = ONLY, mimicking what
  we previously set for INCLUDE/LIBRARY/PROGRAM s/t the standard
  package locations on the host system will not be searched by
  find_package() when cross-compiling for iOS.
- Remove now unnecessary forced disabling of dependency options on iOS
  as they should now never be found (unless they were explicitly built
  for iOS) irrespective of whether the option defaults to ON initially.

Change-Id: I1d2c5da4838d7becb8ebd43f90a88cfc6ded4a1f
2018-06-20 09:43:26 +01:00

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CMake
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# This file is part of the ios-cmake project. It was retrieved from
# https://github.com/cristeab/ios-cmake.git, which is a fork of
# https://code.google.com/p/ios-cmake/. Which in turn is based off of
# the Platform/Darwin.cmake and Platform/UnixPaths.cmake files which
# are included with CMake 2.8.4
#
# The ios-cmake project is licensed under the new BSD license.
#
# Copyright (c) 2014, Bogdan Cristea and LTE Engineering Software,
# Kitware, Inc., Insight Software Consortium. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# This file is based off of the Platform/Darwin.cmake and
# Platform/UnixPaths.cmake files which are included with CMake 2.8.4
# It has been altered for iOS development.
#
# Updated by Alex Stewart (alexs.mac@gmail.com).
# The following variables control the behaviour of this toolchain:
#
# IOS_PLATFORM: OS (default) or SIMULATOR or SIMULATOR64
# OS = Build for iPhoneOS.
# SIMULATOR = Build for x86 i386 iPhone Simulator.
# SIMULATOR64 = Build for x86 x86_64 iPhone Simulator.
# CMAKE_OSX_SYSROOT: Path to the iOS SDK to use. By default this is
# automatically determined from IOS_PLATFORM and xcodebuild, but
# can also be manually specified (although this should not be required).
# CMAKE_IOS_DEVELOPER_ROOT: Path to the Developer directory for the iOS platform
# being compiled for. By default this is automatically determined from
# CMAKE_OSX_SYSROOT, but can also be manually specified (although this should
# not be required).
#
# This toolchain defines the following variables for use externally:
#
# XCODE_VERSION: Version number (not including Build version) of Xcode detected.
# IOS_SDK_VERSION: Version of iOS SDK being used.
# CMAKE_OSX_ARCHITECTURES: Architectures being compiled for (generated from
# IOS_PLATFORM).
#
# This toolchain defines the following macros for use externally:
#
# set_xcode_property (TARGET XCODE_PROPERTY XCODE_VALUE)
# A convenience macro for setting xcode specific properties on targets
# example: set_xcode_property (myioslib IPHONEOS_DEPLOYMENT_TARGET "3.1").
#
# find_host_package (PROGRAM ARGS)
# A macro used to find executable programs on the host system, not within the
# iOS environment. Thanks to the android-cmake project for providing the
# command.
# Get the Xcode version being used.
execute_process(COMMAND xcodebuild -version
OUTPUT_VARIABLE XCODE_VERSION
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE)
string(REGEX MATCH "Xcode [0-9\\.]+" XCODE_VERSION "${XCODE_VERSION}")
string(REGEX REPLACE "Xcode ([0-9\\.]+)" "\\1" XCODE_VERSION "${XCODE_VERSION}")
message(STATUS "Building with Xcode version: ${XCODE_VERSION}")
# Default to building for iPhoneOS if not specified otherwise, and we cannot
# determine the platform from the CMAKE_OSX_ARCHITECTURES variable. The use
# of CMAKE_OSX_ARCHITECTURES is such that try_compile() projects can correctly
# determine the value of IOS_PLATFORM from the root project, as
# CMAKE_OSX_ARCHITECTURES is propagated to them by CMake.
if (NOT DEFINED IOS_PLATFORM)
if (CMAKE_OSX_ARCHITECTURES)
if (CMAKE_OSX_ARCHITECTURES MATCHES ".*arm.*")
set(IOS_PLATFORM "OS")
elseif (CMAKE_OSX_ARCHITECTURES MATCHES "i386")
set(IOS_PLATFORM "SIMULATOR")
elseif (CMAKE_OSX_ARCHITECTURES MATCHES "x86_64")
set(IOS_PLATFORM "SIMULATOR64")
endif()
endif()
if (NOT IOS_PLATFORM)
set(IOS_PLATFORM "OS")
endif()
endif()
set(IOS_PLATFORM ${IOS_PLATFORM} CACHE STRING
"Type of iOS platform for which to build.")
# Determine the platform name and architectures for use in xcodebuild commands
# from the specified IOS_PLATFORM name.
if (IOS_PLATFORM STREQUAL "OS")
set(XCODE_IOS_PLATFORM iphoneos)
set(IOS_ARCH armv7 armv7s arm64)
elseif (IOS_PLATFORM STREQUAL "SIMULATOR")
set(XCODE_IOS_PLATFORM iphonesimulator)
set(IOS_ARCH i386)
elseif(IOS_PLATFORM STREQUAL "SIMULATOR64")
set(XCODE_IOS_PLATFORM iphonesimulator)
set(IOS_ARCH x86_64)
else()
message(FATAL_ERROR "Invalid IOS_PLATFORM: ${IOS_PLATFORM}")
endif()
# If user did not specify the SDK root to use, then query xcodebuild for it.
if (NOT CMAKE_OSX_SYSROOT)
execute_process(COMMAND xcodebuild -version -sdk ${XCODE_IOS_PLATFORM} Path
OUTPUT_VARIABLE CMAKE_OSX_SYSROOT
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE)
message(STATUS "Using SDK: ${CMAKE_OSX_SYSROOT} for platform: ${IOS_PLATFORM}")
endif()
if (NOT EXISTS ${CMAKE_OSX_SYSROOT})
message(FATAL_ERROR "Invalid CMAKE_OSX_SYSROOT: ${CMAKE_OSX_SYSROOT} "
"does not exist.")
endif()
# Get the SDK version information.
execute_process(COMMAND xcodebuild -sdk ${CMAKE_OSX_SYSROOT} -version SDKVersion
OUTPUT_VARIABLE IOS_SDK_VERSION
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE)
# Find the Developer root for the specific iOS platform being compiled for
# from CMAKE_OSX_SYSROOT. Should be ../../ from SDK specified in
# CMAKE_OSX_SYSROOT. There does not appear to be a direct way to obtain
# this information from xcrun or xcodebuild.
if (NOT CMAKE_IOS_DEVELOPER_ROOT)
get_filename_component(IOS_PLATFORM_SDK_DIR ${CMAKE_OSX_SYSROOT} PATH)
get_filename_component(CMAKE_IOS_DEVELOPER_ROOT ${IOS_PLATFORM_SDK_DIR} PATH)
endif()
if (NOT EXISTS ${CMAKE_IOS_DEVELOPER_ROOT})
message(FATAL_ERROR "Invalid CMAKE_IOS_DEVELOPER_ROOT: "
"${CMAKE_IOS_DEVELOPER_ROOT} does not exist.")
endif()
# Find the C & C++ compilers for the specified SDK.
if (NOT CMAKE_C_COMPILER)
execute_process(COMMAND xcrun -sdk ${CMAKE_OSX_SYSROOT} -find clang
OUTPUT_VARIABLE CMAKE_C_COMPILER
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE)
message(STATUS "Using C compiler: ${CMAKE_C_COMPILER}")
endif()
if (NOT CMAKE_CXX_COMPILER)
execute_process(COMMAND xcrun -sdk ${CMAKE_OSX_SYSROOT} -find clang++
OUTPUT_VARIABLE CMAKE_CXX_COMPILER
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE)
message(STATUS "Using CXX compiler: ${CMAKE_CXX_COMPILER}")
endif()
# Find (Apple's) libtool.
execute_process(COMMAND xcrun -sdk ${CMAKE_OSX_SYSROOT} -find libtool
OUTPUT_VARIABLE IOS_LIBTOOL
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE)
message(STATUS "Using libtool: ${IOS_LIBTOOL}")
# Configure libtool to be used instead of ar + ranlib to build static libraries.
# This is required on Xcode 7+, but should also work on previous versions of
# Xcode.
set(CMAKE_C_CREATE_STATIC_LIBRARY
"${IOS_LIBTOOL} -static -o <TARGET> <LINK_FLAGS> <OBJECTS> ")
set(CMAKE_CXX_CREATE_STATIC_LIBRARY
"${IOS_LIBTOOL} -static -o <TARGET> <LINK_FLAGS> <OBJECTS> ")
# Get the version of Darwin (OS X) of the host.
execute_process(COMMAND uname -r
OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_VERSION
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE)
# Specify minimum version of deployment target.
# Unless specified, the latest SDK version is used by default.
set(IOS_DEPLOYMENT_TARGET "${IOS_SDK_VERSION}"
CACHE STRING "Minimum iOS version to build for." )
message(STATUS "Building for minimum iOS version: ${IOS_DEPLOYMENT_TARGET}"
" (SDK version: ${IOS_SDK_VERSION})")
if (NOT IOS_DEPLOYMENT_TARGET VERSION_LESS 11.0)
# iOS 11+ does not support 32-bit architectures (armv7).
foreach(ARCH ${IOS_ARCH})
if (ARCH MATCHES "armv7*")
message(STATUS "Removing iOS architecture: ${ARCH} from build as it is "
"not supported by the minimum iOS version to build for: "
"${IOS_DEPLOYMENT_TARGET} (iOS >= 11 requires 64-bit).")
else()
list(APPEND VALID_IOS_ARCH_FOR_SDK_VERSION ${ARCH})
endif()
endforeach()
set(IOS_ARCH ${VALID_IOS_ARCH_FOR_SDK_VERSION})
endif()
message(STATUS "Configuring iOS build for platform: ${IOS_PLATFORM}, "
"architecture(s): ${IOS_ARCH}")
# Standard settings.
set(CMAKE_SYSTEM_NAME Darwin)
set(CMAKE_SYSTEM_VERSION ${IOS_SDK_VERSION})
set(UNIX TRUE)
set(APPLE TRUE)
set(IOS TRUE)
# Force unset of OS X-specific deployment target (otherwise autopopulated),
# required as of cmake 2.8.10.
set(CMAKE_OSX_DEPLOYMENT_TARGET "" CACHE STRING
"Must be empty for iOS builds." FORCE)
# Set the architectures for which to build.
set(CMAKE_OSX_ARCHITECTURES ${IOS_ARCH} CACHE STRING "Build architecture for iOS")
# All iOS/Darwin specific settings - some may be redundant.
set(CMAKE_SHARED_LIBRARY_PREFIX "lib")
set(CMAKE_SHARED_LIBRARY_SUFFIX ".dylib")
set(CMAKE_SHARED_MODULE_PREFIX "lib")
set(CMAKE_SHARED_MODULE_SUFFIX ".so")
set(CMAKE_MODULE_EXISTS 1)
set(CMAKE_DL_LIBS "")
set(CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG "-compatibility_version ")
set(CMAKE_C_OSX_CURRENT_VERSION_FLAG "-current_version ")
set(CMAKE_CXX_OSX_COMPATIBILITY_VERSION_FLAG "${CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG}")
set(CMAKE_CXX_OSX_CURRENT_VERSION_FLAG "${CMAKE_C_OSX_CURRENT_VERSION_FLAG}")
# Note that only Xcode 7+ supports the newer more specific:
# -m${XCODE_IOS_PLATFORM}-version-min flags, older versions of Xcode use:
# -m(ios/ios-simulator)-version-min instead.
if (XCODE_VERSION VERSION_LESS 7.0)
if (IOS_PLATFORM STREQUAL "OS")
set(XCODE_IOS_PLATFORM_VERSION_FLAGS
"-mios-version-min=${IOS_DEPLOYMENT_TARGET}")
else()
# SIMULATOR or SIMULATOR64 both use -mios-simulator-version-min.
set(XCODE_IOS_PLATFORM_VERSION_FLAGS
"-mios-simulator-version-min=${IOS_DEPLOYMENT_TARGET}")
endif()
else()
# Xcode 7.0+ uses flags we can build directly from XCODE_IOS_PLATFORM.
set(XCODE_IOS_PLATFORM_VERSION_FLAGS
"-m${XCODE_IOS_PLATFORM}-version-min=${IOS_DEPLOYMENT_TARGET}")
endif()
set(CMAKE_C_FLAGS
"${XCODE_IOS_PLATFORM_VERSION_FLAGS} -fobjc-abi-version=2 -fobjc-arc ${CMAKE_C_FLAGS}")
# Hidden visibilty is required for C++ on iOS.
set(CMAKE_CXX_FLAGS
"${XCODE_IOS_PLATFORM_VERSION_FLAGS} -fvisibility=hidden -fvisibility-inlines-hidden -fobjc-abi-version=2 -fobjc-arc ${CMAKE_CXX_FLAGS}")
set(CMAKE_CXX_FLAGS_RELEASE "-DNDEBUG -O3 -fomit-frame-pointer -ffast-math ${CMAKE_CXX_FLAGS_RELEASE}")
set(CMAKE_C_LINK_FLAGS "${XCODE_IOS_PLATFORM_VERSION_FLAGS} -Wl,-search_paths_first ${CMAKE_C_LINK_FLAGS}")
set(CMAKE_CXX_LINK_FLAGS "${XCODE_IOS_PLATFORM_VERSION_FLAGS} -Wl,-search_paths_first ${CMAKE_CXX_LINK_FLAGS}")
# In order to ensure that the updated compiler flags are used in try_compile()
# tests, we have to forcibly set them in the CMake cache, not merely set them
# in the local scope.
list(APPEND VARS_TO_FORCE_IN_CACHE
CMAKE_C_FLAGS
CMAKE_CXX_FLAGS
CMAKE_CXX_RELEASE
CMAKE_C_LINK_FLAGS
CMAKE_CXX_LINK_FLAGS)
foreach(VAR_TO_FORCE ${VARS_TO_FORCE_IN_CACHE})
set(${VAR_TO_FORCE} "${${VAR_TO_FORCE}}" CACHE STRING "" FORCE)
endforeach()
set(CMAKE_PLATFORM_HAS_INSTALLNAME 1)
set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-dynamiclib -headerpad_max_install_names")
set(CMAKE_SHARED_MODULE_CREATE_C_FLAGS "-bundle -headerpad_max_install_names")
set(CMAKE_SHARED_MODULE_LOADER_C_FLAG "-Wl,-bundle_loader,")
set(CMAKE_SHARED_MODULE_LOADER_CXX_FLAG "-Wl,-bundle_loader,")
set(CMAKE_FIND_LIBRARY_SUFFIXES ".dylib" ".so" ".a")
# Hack: if a new cmake (which uses CMAKE_INSTALL_NAME_TOOL) runs on an old
# build tree (where install_name_tool was hardcoded) and where
# CMAKE_INSTALL_NAME_TOOL isn't in the cache and still cmake didn't fail in
# CMakeFindBinUtils.cmake (because it isn't rerun) hardcode
# CMAKE_INSTALL_NAME_TOOL here to install_name_tool, so it behaves as it did
# before, Alex.
if (NOT DEFINED CMAKE_INSTALL_NAME_TOOL)
find_program(CMAKE_INSTALL_NAME_TOOL install_name_tool)
endif (NOT DEFINED CMAKE_INSTALL_NAME_TOOL)
# Set the find root to the iOS developer roots and to user defined paths.
set(CMAKE_FIND_ROOT_PATH ${CMAKE_IOS_DEVELOPER_ROOT} ${CMAKE_OSX_SYSROOT}
${CMAKE_PREFIX_PATH} CACHE string "iOS find search path root" FORCE)
# Default to searching for frameworks first.
set(CMAKE_FIND_FRAMEWORK FIRST)
# Set up the default search directories for frameworks.
set(CMAKE_SYSTEM_FRAMEWORK_PATH
${CMAKE_OSX_SYSROOT}/System/Library/Frameworks
${CMAKE_OSX_SYSROOT}/System/Library/PrivateFrameworks
${CMAKE_OSX_SYSROOT}/Developer/Library/Frameworks)
# Only search the specified iOS SDK, not the remainder of the host filesystem.
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
# This little macro lets you set any XCode specific property.
macro(set_xcode_property TARGET XCODE_PROPERTY XCODE_VALUE)
set_property(TARGET ${TARGET} PROPERTY
XCODE_ATTRIBUTE_${XCODE_PROPERTY} ${XCODE_VALUE})
endmacro(set_xcode_property)
# This macro lets you find executable programs on the host system.
macro(find_host_package)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE NEVER)
set(IOS FALSE)
find_package(${ARGN})
set(IOS TRUE)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
endmacro(find_host_package)
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