qemu: maths: build the math ztests when CONFIG_ZTEST is enabled

Wire up the math basic-arithmetic ztests under
zephyr/test/CMakeLists.txt so they are built whenever
CONFIG_SOF_BOOT_TEST_STANDALONE and CONFIG_ZTEST are enabled, and
expose the corresponding APIs in src/math (find/norm helpers) when
CONFIG_ZTEST is set so the tests link.

In the current tree CONFIG_ZTEST is only enabled by the native_sim
board configuration, so in practice these tests run on native_sim
today, but the gating itself is generic and any board enabling
CONFIG_ZTEST will pick them up.

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

Author: lrgirdwo

src/math/CMakeLists.txt

@@ -106,6 +106,12 @@ if(zephyr) ###  Zephyr ###
     ${base_files}
   )
 
+  if(CONFIG_ZTEST)
+    set_source_files_properties(${CMAKE_CURRENT_SOURCE_DIR}/numbers.c
+      PROPERTIES COMPILE_DEFINITIONS "CONFIG_NUMBERS_VECTOR_FIND=1;CONFIG_NUMBERS_NORM=1"
+    )
+  endif()
+
 else() ### library, e.g. testbench or plugin ###
 
   add_local_sources(sof ${base_files})

src/math/numbers.c

@@ -79,7 +79,7 @@ int gcd(int a, int b)
 EXPORT_SYMBOL(gcd);
 #endif /* USE_SOF_GCD */
 
-#if CONFIG_NUMBERS_VECTOR_FIND
+#if CONFIG_NUMBERS_VECTOR_FIND || CONFIG_ZTEST
 
 /* This function searches from vec[] (of length vec_length) integer values
  * of n. The indexes to equal values is returned in idx[]. The function
@@ -133,9 +133,9 @@ int32_t find_max_abs_int32(int32_t vec[], int vec_length)
 	return SATP_INT32(amax); /* Amax is always a positive value */
 }
 
-#endif /* CONFIG_VECTOR_FIND */
+#endif /* CONFIG_VECTOR_FIND || CONFIG_ZTEST */
 
-#if CONFIG_NUMBERS_NORM
+#if CONFIG_NUMBERS_NORM || CONFIG_ZTEST
 
 /* Count the left shift amount to normalize a 32 bit signed integer value
  * without causing overflow. Input value 0 will result to 31.
@@ -155,7 +155,7 @@ int norm_int32(int32_t val)
 }
 EXPORT_SYMBOL(norm_int32);
 
-#endif /* CONFIG_NORM */
+#endif /* CONFIG_NORM || CONFIG_ZTEST */
 
 /**
  * Basic CRC-32 implementation, based on pseudo-code from

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()