[riot-notifications] [RIOT-OS/RIOT] make: disable dwarf compression on CI builds (#12198)

Kaspar Schleiser notifications at github.com
Tue Sep 10 22:28:56 CEST 2019



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### Contribution description

If enabled, ccache on CI becomes almost ineffective.

This PR guards the CFLAG with RIOT_CI_BUILD.

>From #12110 

```
This somehow makes ccache almost ineffective on CI. Maybe you noticed almost doubled build times today? My first thought 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, 3aa8bc0 (this PR's merge commit) somehow makes ccache ineffective.
```

I tried to reproduce locally with this:

```
cd examples/gnrc_networking; hyperfine -w1 "RIOT_CI_BUILD=1 BOARD=samr21-xpro make clean all -j8"
```

On my laptop, master takes ~2.6s, this PR ~2.2s, so the difference is not so drastic. Let's see how quickly this PR builds on CI. Might need two builds (cold vs hot cache) to see the difference.

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### Issues/PRs references

#12150 

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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/12198

-- Commit Summary --

  * make: disable dwarf compression on CI builds

-- File Changes --

    M makefiles/cflags.inc.mk (7)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/12198.patch
https://github.com/RIOT-OS/RIOT/pull/12198.diff

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