Add support for Apple iOS and improve detection of arm architecture

[fdetro]

I've added a new predef BOOST_OS_IOS for Apple iOS based on detection of the preprocessor macro __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__.

Additionally, I've extended the detection for BOOST_ARCH_ARM with a check for __arm64, a preprocessor macro which is set by the Apple clang compiler for the new ARMv8 64bit architecture.

Both changes enable the use of boost::predef with projects targeting Apple iOS for 32 and 64bit arm architectures.

It would be great if this patch can make it into the next boost release!

[ruslo]

Good patch. BTW it would be nice to have ios simulator detection macro too.

[fdetro]

iOS simulator detection is already there:

BOOST_OS_IOS && BOOST_ARCH_ARM -> iOS device mode
BOOST_OS_IOS && BOOST_ARCH_X86 -> iOS simulator mode

[ruslo]

Well, it's true (: But I think first people's step will be:

#if BOOST_OS_IOS
# if BOOST_ARCH_ARM
#  define MY_MACRO_OS_IOS_DEVICE
# else
#  define MY_MACRO_OS_IOS_SIMULATOR
# endif
#endif

[fdetro]

OK, now I see what you mean. I should probably introduce BOOST_OS_IOS_DEVICE and BOOST_OS_IOS_SIMULATOR, too.

[grafikrobot]

For me to be able to add any new code to a Boost library there must be correct copyright attribution. Please update with your copyright.

[fdetro]

I've changed everything as requested by the review. Is the patch OK now?

[ruslo]

Hi, what about BOOST_OS_IOS_DEVICE and BOOST_OS_IOS_SIMULATOR?

[fdetro]

@ruslo: This DEVICE vs. SIMULATOR case does not really match with the predef OS concept, so I left this out for now.

Maybe @grafikrobot can comment on this...

[grafikrobot]

There's the concept of "platforms" that would likely fit the different iOS
targets. Perhaps having "BOOST_PLAT_IOS_DEVICE" and
"BOOST_PLAT_IOS_SIMULATOR"?

On Wed, Apr 30, 2014 at 1:55 AM, Franz Detro [email protected]:

@ruslo https://github.com/ruslo: This DEVICE vs. SIMULATOR case does
not really match with the predef OS concept, so I left this out for now.

Maybe @grafikrobot https://github.com/grafikrobot can comment on this...

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[ruslo]

Perhaps having "BOOST_PLAT_IOS_DEVICE" and "BOOST_PLAT_IOS_SIMULATOR"?

Sounds nice