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sdefresne@chromium.org authored
Since iOS 7, the iPhone 5s, the iPad Air and the iPad Mini Retina supports 64-bits binaries. This requires building a fat binary with support for both armv7 and arm64 (and optionally armv7s). In an effort to prepare building such a fat binary for Chrome on iOS, introduce a "target_subarch" variable that control the variant we want to build (32-bit only, 64-bit only -- mainly for debugging, fat binary). This require introducing way to use the clang compiler shipped with Xcode, as the clang compiler shipped with Chromium code does not support "arm64" architecture yet (Apple has not yet opensource the implementation). BUG=341453, 314720 R=mark@chromium.org Review URL: https://codereview.chromium.org/156473005 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251083 0039d316-1c4b-4281-b951-d872f2087c98
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