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Bug 1490

Summary: iOS compilation via configure/make [patch]
Product: SDL Reporter: Gabriel Jacobo <gabomdq>
Component: buildAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: HG 2.0   
Hardware: All   
OS: iOS (All)   
Attachments: Allows SDL for iOS compilation via configure/make

Description Gabriel Jacobo 2012-05-12 07:03:43 UTC 
Created attachment 853 [details]
Allows SDL for iOS compilation via configure/make

I've attached a small patch that allows to compile SDL for iOS using configure/make by providing the --host=arm-apple-darwin parameter. It's not a complete solution because you still have to copy SDL_config_iphoneos.h over SDL_config.h, but it may be useful for others anyway as it produces a static library that you can just throw into XCode projects without having to set up anything else.
Comment 1 Sam Lantinga 2012-06-01 11:35:16 UTC 
I tried this, but it's not using the right API headers and so forth.  Do you have a complete command line that works?
Comment 2 Gabriel Jacobo 2012-06-01 11:42:32 UTC 
I set up the adequate environment variables as in any cross compilation using a Python function:

def prepare_ios_env(sdk=None, target='3.0'):
    """ Set up the environment variables for iOS compilation"""
    env = deepcopy(os.environ)
    global XCODE_ROOT, BEST_IOS_SDK

    if XCODE_ROOT is None:
        XCODE_ROOT = find_xcode()

    if BEST_IOS_SDK is None:
        BEST_IOS_SDK = find_ios_sdk()

    if sdk is None:
        sdk = BEST_IOS_SDK

    env['DEVROOT'] = join(XCODE_ROOT, 'Platforms/iPhoneOS.platform/Developer')
    env['SDKROOT'] = env['DEVROOT'] + '/SDKs/iPhoneOS%s.sdk' % sdk
    env['CFLAGS'] = env['CXXFLAGS'] = "-g -O2 -pipe -no-cpp-precomp -isysroot %s -miphoneos-version-min=%s -I%s/usr/include/" % (env['SDKROOT'], target, env['SDKROOT'])
    env['CXXCPP'] = env['CPP'] = env['DEVROOT'] + "/usr/bin/llvm-cpp-4.2"
    env['CXX'] = env['DEVROOT'] + "/usr/bin/llvm-g++-4.2"
    env['CC'] = env['DEVROOT'] + "/usr/bin/llvm-gcc-4.2"
    env['LD'] = env['DEVROOT'] + "/usr/bin/ld"
    env['AR'] = env['DEVROOT'] + "/usr/bin/ar"
    env['AS'] = env['DEVROOT'] + "/usr/bin/ls"
    env['NM'] = env['DEVROOT'] + "/usr/bin/nm"
    env['RANLIB'] = env['DEVROOT'] + "/usr/bin/ranlib"
    env['STRIP'] = env['DEVROOT'] + "/usr/bin/strip"
    env['LDFLAGS'] = "-L%s/usr/lib/ -isysroot %s -miphoneos-version-min=%s" % (env['SDKROOT'], env['SDKROOT'], target)
    return env



I configure with something like this:

./configure --host=armv6-apple-darwin CFLAGS="-arch armv6" LDFLAGS="-arch armv6 -static-libgcc" --disable-shared --enable-static --prefix="some/path"

After running configure, I overwrite SDL_config.h with SDL_config_iphoneos.h, and run make.
Comment 3 Gabriel Jacobo 2012-06-01 11:45:52 UTC 
I actually run the process twice, once with -arch armv6 another with -arch armv7 (and you could do it a third time for simulator support with -arch i386), then lipo all versions together.

The source code for the SDL/iOS compilation code is here: https://bitbucket.org/gabomdq/ignifuga/src/27af5d22dbe8/tools/modules/sdl/ios.py but as I said, it's no different than cross compiling for other platforms really.
Comment 4 Gabriel Jacobo 2012-06-05 14:55:59 UTC 
Sam, you merged a few changes from this patch already, is there anything more needed to merge the rest (basically the configure/configure.in changes) ?
Comment 5 Gabriel Jacobo 2012-06-20 13:40:04 UTC 
This patch was accepted (see iosbuild.sh)