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Can someone tell me the differences or advantages/disadvantages between the 3x possible compilers. ie. Why are they offered?
"So C arm legacy product?"
Keil have declared their original product, called "CARM", to be a "legacy" product.
"there are quite a number of questions on ARM in this forum"
Although CARM has been declared a "legacy" product, Keil does still have a current ARM product - it's called "Realview"
uVision still also supports GCC
You can read all about it on the ARM Products page:
http://www.keil.com/arm/