[riot-notifications] [RIOT-OS/RIOT] toolchain/cflags: enable dwarf compression (save 50% HDD) (#12150)
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Tue Sep 10 22:05:51 CEST 2019
This somehow makes ccache almost ineffective on CI. Maybe you noticed almost doubled build times today? My [first thought](https://github.com/RIOT-OS/RIOT/pull/10661#issuecomment-529918452) turned out to be wrong. During the day, I cleared the cache on one of the workers, but build times stayed double. So cache thrashing was no issue, (and should't be actually as even the oldest PRs get rebased to master and are thus not much different).
Then I ran a script that ran a limited build (samr21-xpro only) on one worker, once with clean cache, then one more time with hot cache, on all merged commits since the last nightly.
Long story short, 3aa8bc0d7001f2304225295fe53e46ba58e3d22d (this PR's merge commit) somehow makes ccache ineffective.
@jcarrano can we maybe just add "-gz" to CFLAGS_DBG?
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