unittests: tests-core doesn't compile for all platforms #2143
Description
Currently, the unit test for core doesn't compile for msp430 based platforms.
In my opinion at least the unit test for core must compile for every platform we support.
The primary problem seems to be the use of gcc compiler builtins (__builtin_clz and __builtin_ctz) in the bitarithm test:
$ msp430-gcc --version
msp430-gcc (GCC) 4.6.3 20120301 (mspgcc LTS 20120406 unpatched)
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ make tests-core BOARD=telosb
touch /home/philipp/RIOT/tests/unittests/main.c
Building application unittests for telosb w/ MCU msp430f1611.
"make" -C /home/philipp/RIOT/boards/telosb
"make" -C /home/philipp/RIOT/core
"make" -C /home/philipp/RIOT/cpu/msp430x16x
"make" -C /home/philipp/RIOT/cpu/msp430-common
"make" -C /home/philipp/RIOT/drivers
"make" -C /home/philipp/RIOT/sys
"make" -C /home/philipp/RIOT/sys/oneway-malloc
"make" -C /home/philipp/RIOT/tests/unittests/embunit/embUnit
"make" -C /home/philipp/RIOT/tests/unittests/tests-core
/home/philipp/RIOT/tests/unittests/bin/telosb/tests-core.a(tests-core-bitarithm.o): In function `test_bitarithm_lsb_all':
/home/philipp/RIOT/tests/unittests/tests-core/tests-core-bitarithm.c:188: undefined reference to `__ctzhi2'
/home/philipp/RIOT/tests/unittests/bin/telosb/tests-core.a(tests-core-bitarithm.o): In function `test_bitarithm_msb_16bit':
/home/philipp/RIOT/tests/unittests/tests-core/tests-core-bitarithm.c:164: undefined reference to `__clzhi2'
collect2: ld returned 1 exit status
make: *** [all] Error 1
Does anybody have an idea how to fix this?
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Area: RIOT kernel. Handle PRs marked with this with care!Area: tests and testing frameworkThis PR is a candidate for review and discussion during one of RIOT's monthly Hack'n'ACK partiesThe issue/PR is used as a discussion starting point about the item of the issue/PRPlatform: This PR/issue effects MSP-based platforms