README: update toolchain recommendations
This hadn't been touched in a while, and we now need gcc6+ Fixes: https://github.com/libopencm3/libopencm3/issues/1459 Signed-off-by: Karl Palsson <karlp@tweak.au>
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@@ -80,15 +80,15 @@ After that you can navigate to the folder where you've extracted libopencm3 and
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Toolchain
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Toolchain
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The most heavily tested toolchain is "gcc-arm-embedded"
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The most heavily tested toolchain is ["gcc-arm-embedded"](https://developer.arm.com/Tools%20and%20Software/GNU%20Toolchain)
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https://launchpad.net/gcc-arm-embedded
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This used to be available at https://launchpad.net/gcc-arm-embedded
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Other toolchains _should_ work, but they have not been nearly as well tested.
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Other toolchains _should_ work, but they have not been nearly as well tested.
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Toolchains targeting Linux, such as "gcc-arm-linux-gnu" or the like are
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Toolchains targeting Linux, such as "gcc-arm-linux-gnu" or the like are
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_not_ appropriate.
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_not_ appropriate.
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_NOTE_: We recommend that you use gcc-arm-embedded version 4.8 2014q3 or newer
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_NOTE_: GCC version 6 or later is required, as we're using attributes on enumerators
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to build all platforms covered by libopencm3 successfully.
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to help mark deprecations.
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Building
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Building
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--------
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--------
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