configure: fix flags for unit tests

[jajanusz]

-nostdlib breaks UT because cmoka need stdlib
At all "-nostdlib" was only flag that was required to not break gcc builds, because for some reason gcc needs it, however I'm not gonna mess with it more atm.
I also removed flags that was already forced.

Requires volume tests fix: #112

Signed-off-by: Janusz Jankowski janusz.jankowski@linux.intel.com

[jajanusz]

Requires volume tests fix: #112

[lgirdwood]

ok, just to clarify the cmocka test is built $with_arch == xtensa ? The reason I'm asking is because the condition logic should exclude the -nostdlib CFLAG if target is not xtensa.

[jajanusz]

Target is the same, you have the same config like for building firmware library, you just run make check instead of make it will invoke make like for normal build and then tests that link to specific little static libs that build for sof final binary anyway.
We can do another specific configuration just for test but then you will have to manage building for each platform for test etc and you won't be able to build normal binary and run test without reconfigure.
Also target is xtensa, if you run binary in xtensa simulator you have stdlib

[jajanusz]

You can read more about tests here:
https://github.com/thesofproject/sof-docs/blob/master/developer_guides/unit_tests.rst#enabling-unit-tests

[jajanusz]

And it looks like cmocka will not work with our gcc toolchains because they need -nostdlib no matter what, only xcc supports stdlib (and gcc host builds ofc, but they have way less unit tests, because most of them require platforms code). I can find a way around this issue, but I guess xcc tests are enough atm.

[lgirdwood]

Ok, we now have a need for a C library. Crosstool can build one as part of our GCC build.

[lgirdwood]

Looks like we are also missing cmocka header path in CFLAGS too.
make[2]: Entering directory '/home/lrg/source/reef/sof.git/test/cmocka'
make alloc volume_process buffer_new buffer_write buffer_wrap buffer_copy component_set_state list_init list_is_empty list_item_append list_item_del list_item_is_last list_item_prepend list_item gcd ceil_divide find_equal_int16 find_min_int16 find_max_abs_int32 norm_int32 sin_fixed
make[3]: Entering directory '/home/lrg/source/reef/sof.git/test/cmocka'
depbase=echo src/lib/alloc/alloc.o | sed 's|[^/]*$|.deps/&|;s|\.o$||';
xtensa-byt-elf-gcc -DHAVE_CONFIG_H -I. -I../../src/include -fno-inline-functions -mlongcalls -I../../src/arch/xtensa/include -I../../src/platform/apollolake/include -I../../src/audio -I /home/lrg/source/reef/sof.git/src/include -I /home/lrg/source/reef/sof.git/../xtensa-root/xtensa-byt-elf/include -O2 -g -Wall -Werror -Wl,-EL -Wmissing-prototypes -MT src/lib/alloc/alloc.o -MD -MP -MF $depbase.Tpo -c -o src/lib/alloc/alloc.o src/lib/alloc/alloc.c &&
mv -f $depbase.Tpo $depbase.Po
src/lib/alloc/alloc.c:35:10: fatal error: cmocka.h: No such file or directory
#include <cmocka.h>
^~~~~~~~~~
compilation terminated.

[jajanusz]

@lgirdwood
As it is written in UT docs you have to point to your cmocka installation (--with-cmocka-prefix) - at this path as in any other lib will be lib/ and include/.
I think we don't want to include cmocka into our project cos you have to do a bit of magic to build it for our platforms (also it is build with CMake what is another problem).

[jajanusz]

Maybe we should host these prebuilt cmocka packages for each platform in sof-tools or something like that

[lgirdwood]

@jajanusz ok, lets revisit this later, I did not realise that cmocka was built for target. It seems we also need to ship C library too and this is probably something done better in docker by @xiulipan .