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GNU versus Realview versus Keil C Arm

Can someone tell me the differences or advantages/disadvantages between the 3x possible compilers. ie. Why are they offered?

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  • "Why are they offered?"

    In the beginning, Keil was an independent company and developed its own compiler - CARM.
    They also offered GNU support - presumably because it's popular and free, in the hope of catching a few upgrades?

    Then Keil was bought by ARM, along came RealView, and CARM was demoted to a "legacy" product.

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  • "Why are they offered?"

    In the beginning, Keil was an independent company and developed its own compiler - CARM.
    They also offered GNU support - presumably because it's popular and free, in the hope of catching a few upgrades?

    Then Keil was bought by ARM, along came RealView, and CARM was demoted to a "legacy" product.

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