[riot-notifications] [RIOT-OS/RIOT] makefiles: do not remove defines from CFLAGS (#12262)

Kaspar Schleiser notifications at github.com
Mon Sep 30 22:24:05 CEST 2019


> which unfortunately makes caching less effective.

Some data:

These are the ccache stats after two consecutive builds of all samr21-xpro configurations, of this PR's merge commit:

```
cache directory                     /data/riotbuild/.ccache                                                                        
primary config                      /data/riotbuild/.ccache/ccache.conf
secondary config      (readonly)    /etc/ccache.conf        
stats zero time                     Mon Sep 30 17:59:37 2019
cache hit (direct)                  2197
cache hit (preprocessed)           72539  
cache miss                          8164  
cache hit rate                     90.15 %
cleanups performed                    16   
files in cache                     53264   
cache size                         304.4 MB
max files                        3500000                   
max cache size                      14.0 GB                
```

This is from the merge commit before:

```
cache directory                     /data/riotbuild/.ccache
primary config                      /data/riotbuild/.ccache/ccache.conf
secondary config      (readonly)    /etc/ccache.conf
stats zero time                     Mon Sep 30 18:06:54 2019
cache hit (direct)                 29659
cache hit (preprocessed)           44990
cache miss                          8075
cache hit rate                     90.24 %
cleanups performed                    16
files in cache                     37035
cache size                         193.1 MB
max files                        3500000
max cache size                      14.0 GB
```


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