[posix] remove duplicate otExitCodeToString definition (#4928)

examples/platforms/samr21/CMakeLists.txt

@@ -88,6 +88,8 @@ target_compile_definitions(openthread-samr21
 
 target_compile_options(openthread-samr21
     PRIVATE
+        -Wno-implicit-function-declaration
+        -Wno-expansion-to-defined
         ${OT_CFLAGS}
 )
 

src/ncp/CMakeLists.txt

@@ -105,6 +105,7 @@ target_link_libraries(openthread-ncp-ftd
     PUBLIC
         openthread-ftd
     PRIVATE
+        ${OT_PLATFORM_LIB}
         ${OT_MBEDTLS}
         openthread-hdlc
         openthread-spinel-ncp

src/posix/platform/misc.cpp

@@ -108,46 +108,3 @@ exit:
 
     return fd;
 }
-
-const char *otExitCodeToString(uint8_t aExitCode)
-{
-    const char *retval = NULL;
-
-    switch (aExitCode)
-    {
-    case OT_EXIT_SUCCESS:
-        retval = "Success";
-        break;
-
-    case OT_EXIT_FAILURE:
-        retval = "Failure";
-        break;
-
-    case OT_EXIT_INVALID_ARGUMENTS:
-        retval = "InvalidArgument";
-        break;
-
-    case OT_EXIT_RADIO_SPINEL_INCOMPATIBLE:
-        retval = "RadioSpinelIncompatible";
-        break;
-
-    case OT_EXIT_RADIO_SPINEL_RESET:
-        retval = "RadioSpinelReset";
-        break;
-
-    case OT_EXIT_RADIO_SPINEL_NO_RESPONSE:
-        retval = "RadioSpinelNoResponse";
-        break;
-
-    case OT_EXIT_ERROR_ERRNO:
-        retval = strerror(errno);
-        break;
-
-    default:
-        assert(false);
-        retval = "UnknownExitCode";
-        break;
-    }
-
-    return retval;
-}

third_party/microchip/CMakeLists.txt

@@ -80,10 +80,10 @@ target_compile_options(samr21-driver
     PUBLIC
         -Werror
         -Wno-unused-parameter
-        -Wno-implicit-function-declaration
-        -Wno-expansion-to-defined
         -fno-strict-aliasing
     PRIVATE
+        -Wno-implicit-function-declaration
+        -Wno-expansion-to-defined
         ${OT_CFLAGS}
 )