I must be obtuse, I cannot find the new opitimization levels in C51 v7.0. Here are my Help->About stats:
uVision = 2.30 C51 = 7.00 A51 = 7.00a BL51 = 5.00 LIB51 = 4.23 OH51 = 2.6 S8051 = 2.30 DP51 = 2.30
That would do it. Thanks. However, now a flawless build turns into many unresolved external symbols like printf(). Looks like LX51 isn't finding the standard library anymore.
Perhaps you could add your experiences to this thread when you're done: http://www.keil.com/forum/docs/thread1481.asp
If the linker can't find a library file that it's looking for you'll get an L210 I/O Error. After installing a beta of version 7.0 I had a problem with LX51 crashing when it should have been generating unresolved external errors. Keil suggested a full reinstall as I had applied several updates over the preceding weeks and indeed this fixed the problem.