tests/subsys/cpp/libcxx: add cpp.libcxx.arcmwdtlib test

Add cpp.libcxx.arcmwdtlib to test C++ library from MWDT
toolchain (with MWDT C library)

Signed-off-by: Eugeniy Paltsev <[email protected]>
Signed-off-by: Evgeniy Paltsev <[email protected]>

Author: evgeniy-paltsev

tests/subsys/cpp/libcxx/prj.conf

@@ -1,4 +1,3 @@
-CONFIG_NEWLIB_LIBC=y
 CONFIG_CPLUSPLUS=y
 CONFIG_LIB_CPLUSPLUS=y
 CONFIG_STD_CPP17=y

tests/subsys/cpp/libcxx/testcase.yaml

@@ -1,19 +1,29 @@
 common:
-  filter: TOOLCHAIN_HAS_NEWLIB == 1
   integration_platforms:
     - mps2_an385
 tests:
   cpp.libcxx.newlib:
+    filter: TOOLCHAIN_HAS_NEWLIB == 1
     toolchain_exclude: xcc
     min_flash: 54
     tags: cpp
     extra_configs:
+        - CONFIG_NEWLIB_LIBC=y
         - CONFIG_NEWLIB_LIBC_NANO=n
         - CONFIG_EXCEPTIONS=y
   cpp.libcxx.newlib_nano:
+    filter: TOOLCHAIN_HAS_NEWLIB == 1
     toolchain_exclude: xcc
     min_flash: 54
     tags: cpp
     timeout: 30
     extra_configs:
+        - CONFIG_NEWLIB_LIBC=y
         - CONFIG_NEWLIB_LIBC_NANO=y
+  cpp.libcxx.arcmwdtlib:
+    toolchain_allow: arcmwdt
+    platform_allow: nsim_hs nsim_em
+    min_flash: 54
+    tags: cpp
+    extra_configs:
+        - CONFIG_ARCMWDT_LIBC=y