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How to build for iOS

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Billy O'Neal edited this page Dec 20, 2018 · 14 revisions

How to build and setup on iOS

First, follow all the instructions on Setup and Build on OSX. While some steps could be skipped if you only want to build for iOS, it is useful to diagnose problems during the initial iOS project setup by replicating it on OSX.

The C++ REST SDK depends on Boost and OpenSSL when used on iOS. It is a non-trivial task to cross-compile libraries for iOS, however there are scripts available online with nonrestrictive licenses to compile many popular libraries -- among these libraries are Boost and OpenSSL.

If you have pre-builts for the Boost or OpenSSL, you can place these in the Build_iOS directory. Boost will work with either a framework or static versions of the lib.

If boost.framework/boost or openssl directories do not exist, then configure.sh will download and build the library.

If using static lib version of boost, the directory structure must be:

boost/include boost/lib

This document will walk through the steps to build the C++ REST SDK and its dependencies into a form suitable for use with iOS applications.

For this walkthrough, we assume you are working within the Build_iOS directory of the project.

git clone https://github.com/Microsoft/cpprestsdk.git casablanca
pushd casablanca/Build_iOS
./configure.sh

This will produce a universal static library called "libcpprest.a" for the x86_64 simulator, arm64, and arm64e (64-bit architectures).

configure.sh accepts arguments to customize the generated static library. Acceptable arguments are listed below.

Usage: configure.sh [-build_type type] [-deployment_target version] [-config_only] [-include_32bit] [-no_bitcode]
       -build_type defines the CMAKE_BUILD_TYPE used. Defaults to Release.
       -deployment_target defines minimum iOS Deployment Target. The default is dependent on ios.toolchain.cmake and currently defaults to 8.0
       -config_only only configures cmake (no make invoked).
       -include_32bit includes the 32-bit arm architectures.
       -no_bitcode disables bitcode

The following examples show possible configurations:

Debug build type

./configure.sh -build_type Debug

32-bit and 64-bit architectures with iOS 10.0 as the minimum deployment

./configure.sh -deployment_target 10.0 -include_32bit

Disabled bitcode without making after configure

./configure.sh -no_bitcode -config_only

Built library

The built static lib will be placed in the directory

Build_iOS/build.TYPE.ios/lib

The include files will be copied to

Build_iOS/build.TYPE.ios/include

Where TYPE is the CMAKE_BUILD_TYPE used to configure cmake. This is set via the -build_type argument to configure.sh

Using the C++ REST SDK

You will need to link against the following from your project:

  • build.debug/libcpprest.a
  • boost.framework (if using boost framework)
  • boost directory containing static versions of the boost libraries
  • openssl/lib/libcrypto.a
  • openssl/lib/libssl.a
  • libiconv.dylib (Available within the default list of libraries to link)
  • Security.framework (Available within the default list of libraries to link)

You will also need to add the following paths as additional include directories:

  • ../Debug/include
  • boost.framework/Headers (if boost.framework used)
  • boost/include (if boost static libs )
  • openssl/include

This should allow you to reference and use the C++ REST SDK from your C++ and Objective-C++ source files. Note: you should change all .m files in your project to .mm files, because even if the source file itself does not use the C++ REST SDK, it is possible that some C++ code will be pulled in via header includes. To avoid errors later, it is easiest to simply rename all your project sources to use '.mm'.

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