qemu: maths: build the math ztests on native_sim

Add the math basic-arithmetic ztests
(test_crc32_ztest.c, test_find_*_ztest.c, test_gcd_ztest.c,
test_norm_int32_ztest.c) to the SOF boot-test build under
zephyr/test/CMakeLists.txt when both
CONFIG_SOF_BOOT_TEST_STANDALONE and CONFIG_ZTEST are enabled.

The math helpers themselves (find_*_int*, norm_int32) are gated by
CONFIG_NUMBERS_VECTOR_FIND / CONFIG_NUMBERS_NORM in src/math/numbers.c
and are now enabled per-board in app/boards/native_sim.conf, where
CONFIG_ZTEST is set. This keeps the gating clean and explicit per
board rather than coupling math source compilation to CONFIG_ZTEST.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Author: lrgirdwo

zephyr/test/CMakeLists.txt

@@ -26,3 +26,20 @@ endif()
 if(CONFIG_SOF_BOOT_TEST_STANDALONE AND CONFIG_SOF_USERSPACE_LL)
   zephyr_library_sources(userspace/test_ll_task.c)
 endif()
+
+if(CONFIG_SOF_BOOT_TEST_STANDALONE AND CONFIG_ZTEST)
+  set(MATH_ZTEST_SOURCES
+    ../../test/ztest/unit/math/basic/arithmetic/test_crc32_ztest.c
+    ../../test/ztest/unit/math/basic/arithmetic/test_find_equal_int16_ztest.c
+    ../../test/ztest/unit/math/basic/arithmetic/test_find_max_abs_int32_ztest.c
+    ../../test/ztest/unit/math/basic/arithmetic/test_find_min_int16_ztest.c
+    ../../test/ztest/unit/math/basic/arithmetic/test_gcd_ztest.c
+    ../../test/ztest/unit/math/basic/arithmetic/test_norm_int32_ztest.c
+  )
+
+  zephyr_library_sources(${MATH_ZTEST_SOURCES})
+
+  set_source_files_properties(${MATH_ZTEST_SOURCES}
+    PROPERTIES COMPILE_DEFINITIONS "CONFIG_NUMBERS_VECTOR_FIND=1;CONFIG_NUMBERS_NORM=1;UNIT_TEST=1"
+  )
+endif()