<p>Ok. On my Ubuntu 19.04 machine I also get a decrease of ROM:</p>
<pre><code>[mlenders@sarajevo RIOT]<3 RIOT_CI_BUILD=1 BOARD=nrf52dk make -C tests/minimal/
make: Entering directory '/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal'
Building application "tests_minimal" for "nrf52dk" with MCU "nrf52".

^Cmake[2]: *** [/home/mlenders/Repositories/RIOT-OS/RIOT/Makefile.base:83: /home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal/bin/nrf52dk/core/cond.o] Interrupt
make[1]: *** [/home/mlenders/Repositories/RIOT-OS/RIOT/Makefile.base:20: ALL--/home/mlenders/Repositories/RIOT-OS/RIOT/core] Interrupt
make: *** [/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal/../../Makefile.include:481: /home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal/bin/nrf52dk/application_tests_minimal.a] Interrupt

[mlenders@sarajevo RIOT]<3 RIOT_CI_BUILD=1 BOARD=nrf52dk make -C tests/minimal/ -j16
make: Entering directory '/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal'
Building application "tests_minimal" for "nrf52dk" with MCU "nrf52".

   text    data     bss     dec     hex filename
   2352      12    2532    4896    1320 /home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal/bin/nrf52dk/tests_minimal.elf
make: Leaving directory '/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal'
[mlenders@sarajevo RIOT]<3 RIOT_CI_BUILD=1 BOARD=arduino-uno make -C tests/minimal/ -j16
make: Entering directory '/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal'
Building application "tests_minimal" for "arduino-uno" with MCU "atmega328p".

   text    data     bss     dec     hex filename
   2842      50     897    3789     ecd /home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal/bin/arduino-uno/tests_minimal.elf
make: Leaving directory '/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal'
[mlenders@sarajevo RIOT]<3 RIOT_CI_BUILD=1 BOARD=z1 make -C tests/minimal/ -j16
make: Entering directory '/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal'
Building application "tests_minimal" for "z1" with MCU "msp430fxyz".

   text    data     bss     dec     hex filename
   1698       6     984    2688     a80 /home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal/bin/z1/tests_minimal.elf
</code></pre>
<p>vs <code>HEAD~1</code> (master this is based on)</p>
<pre><code>[mlenders@sarajevo RIOT]<3 RIOT_CI_BUILD=1 BOARD=nrf52dk make -C tests/minimal/ -j16
make: Entering directory '/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal'
Building application "tests_minimal" for "nrf52dk" with MCU "nrf52".

   text    data     bss     dec     hex filename
   2352      12    2532    4896    1320 /home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal/bin/nrf52dk/tests_minimal.elf
make: Leaving directory '/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal'
[mlenders@sarajevo RIOT]<3 RIOT_CI_BUILD=1 BOARD=arduino-uno make -C tests/minimal/ -j16
make: Entering directory '/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal'
Building application "tests_minimal" for "arduino-uno" with MCU "atmega328p".

   text    data     bss     dec     hex filename
   2844      50     897    3791     ecf /home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal/bin/arduino-uno/tests_minimal.elf
make: Leaving directory '/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal'
[mlenders@sarajevo RIOT]<3 RIOT_CI_BUILD=1 BOARD=arduino-uno make -C tests/minimal/ -j16
make: Entering directory '/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal'
Building application "tests_minimal" for "arduino-uno" with MCU "atmega328p".

   text    data     bss     dec     hex filename
   2844      50     897    3791     ecf /home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal/bin/arduino-uno/tests_minimal.elf
make: Leaving directory '/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal'
[mlenders@sarajevo RIOT]<3 RIOT_CI_BUILD=1 BOARD=z1 make -C tests/minimal/ -j16
make: Entering directory '/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal'
Building application "tests_minimal" for "z1" with MCU "msp430fxyz".

   text    data     bss     dec     hex filename
   1700       6     984    2690     a82 /home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal/bin/z1/tests_minimal.elf
make: Leaving directory '/home/mlenders/Repositories/RIOT-OS/RIOT/tests/minimal'
</code></pre>

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