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cpu/cortexm_common: enable LTO by default #14795

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cpu/cortexm_common: enable LTO by default #14795

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Commits on Aug 19, 2020

  1. makefiles/cflags.inc.mk: remove LTO warning 

    The feature has been in place for 4 years now, let's remove the warning.
    @benpicco
    benpicco committed Aug 19, 2020
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Commits on Aug 25, 2020

  1. cpu/cortexm_common: enable LTO by default 

    LTO support in GCC should be pretty mature by now, to a point where
Fedora enables it by default for all packages[0].

Let's follow suit by enabling LTO for our Cortex-M target.
This is the most mature target and is well-tested regularly.
So if any issues are caused by this, they should pop up fairly quick.

[0] https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/CQEI3UGK5HSHZ7JHE7NRTQHBWQYWA5HM/
    @benpicco
    benpicco committed Aug 25, 2020
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