As reported by Chris Foreman at Ars Technica, code strings related to Marvell’s ARM-based quad-core CPUs have been found in the latest source code of Clang, Apple’s compiler for Xcode. Specifically, Ars Technica notes Clang shows support for Marvell’s Armada XP processor with an “undefined” open source flag, suggesting that only Apple can internally build code targeted towards such CPU.

A developer who works on low-level ARM assembly coding for security products was the first to alert Ars that support had been added for Armada’s Cortex A9-compatible processors in the latest version of Xcode (a claim that we later confirmed first-hand). The source code for a part of Clang that interprets what CPU type is being targeted for optimization includes a definition for an architecture type of “armv7k” and CPU type “pj4b”. PJ4B is a specially optimized CPU design used in Marvell’s quad-core Armada XP embedded processors. Source code available from the LLVM project, including Apple-specific branches, doesn’t contain any reference to the Marvell design.

There are a number of reasons why Apple would like to test support for ARM-based quad-core CPUs. First is low-power consumption, a characteristic of ARM architectures that has allowed Apple to build mobile devices with amazing battery life. Second is performance – just like the dual-core A5 provides faster graphics and performances than the first-gen A4, it wouldn’t be a surprise to know Apple is testing quad-core processors for the next generation of phones and tablets. On the other hand, the MacBook Airs were rumored earlier this year to be considered as the first Mac model to switch to ARM (again, the rumors mentioned battery life, extreme portability, and other often-quoted ARM advantages), although such transition would require developers to update their OS X applications to work with ARM, possibly only on MacBook Airs to start with. Many doubt Apple will switch Macs to ARM in the short term, especially considering Intel’s upcoming Ivi Bridge and Haswell processors (supposed to tackle the battery life and power consumption issues).

It’s interesting to note, however, that Apple is at least testing ARM-based quad-core CPUs internally, and that these references have made it into Clang’s source code.

Reuters reports on the Financial Times’ web app’s performances, noting that the HTML5-optimized version of FT.com has now 700,000 users, proving it to be “more popular” than the newspaper’s iOS app. Financial Times made headlines when it couldn’t agree with Apple on iTunes’ subscription rules for publishers – which require companies to give a 30% revenue cut to Apple, and make sharing of subscriber data opt-in. It was previously reported that 50% of iTunes subscribers opted to share their personal information; however, the Financial Times wanted more control over its mobile application, and decided to develop an HTML5 version instead. The iOS app was then pulled from the App Store.

People who are using the app are spending much more time with the content,” he said. “They are consuming about three times as many pages through the app as they are through the desktop in an average visit.”

The FT’s Web-based mobile app accounts for 15 percent of FT.com subscriptions and 20 percent of total FT.com page views from mobile users, Grimshaw said.

After launching the new web app on June 7, the Financial Times reported after three weeks they achieved 200,000 downloads, with 100,000 in the first week alone. In spite of its web app nature, the iOS-optimized FT app recommends users to “add it to their home screens”, requesting access to increased database size for local cache.

Apple has been doing a number of things to address the issues with subscriptions and delivery of content on iOS devices. They first launched iTunes app subscriptions in February, making it easier for users to subscribe to newspapers and magazine with their existing iTunes accounts. Then at WWDC the company announced Newsstand, a new unified virtual shelf on iOS devices for content a user is subscribed to. Adobe has already announced its publishing tools will be updated to take advantage of iOS 5’s Newsstand. The Financial Times is not the only publisher to find an alternative route out of Apple’s App Store, as Amazon released a web-based version of its Kindle reader with direct integration with the Kindle Store.

Both the Financial Times and Amazon couldn’t comply with Apple’s subscription rules, even after Apple slightly modified them to open up to more publishers in June.

According to a series of tweets posted earlier today by @chronic on the @chronicwire Twitter account, accessory maker OtterBox has built over 3 million cases for a rumored upcoming “iPhone 4S” device. As seen in the photos posted online, the packaging of one of such cases depicts the “iPhone 4S” name, as well as what appears to be a redesigned position for the iPhone’s volume buttons, seen on the right of the device. You can check out more photos over at Twitter.

Chronic has been a source of Apple-related “leaks” in the past. For instance, he posted screenshots of several internal iOS 5 settings (high-quality YouTube and FaceTime over 3G), as well as information in the weeks that lead up to Apple’s Back to School promotion in June. Chronic was, however, incorrect in reporting MacBook Air updates weeks before Apple actually shipped the refreshed models.

There’s been a controversy in iPhone-related rumors in the past months as to whether Apple will ship a “completely redesigned” iPhone 5 in October, an iPhone 4-like “iPhone 4S” device (such name was first used by 9to5mac in discussing an A5-powered iPhone 4), or both. According to recent speculation, Apple is set to hold a media event to introduce the next iPhone on October 4th. A number of cases from third-party manufacturers have surfaced in the past months, showing both signs of a redesigned device and something very similar to the iPhone 4 – thus the discrepancy in iPhone 4S-iPhone 5 rumors. You can read more about this in our iPhone rumor roundup and retrospective.