Support application profile link selection

This provides one approach to address cmake link mess with mbed-core-flags/
mbed-rtos-flags whose links or not depends on selected application profile,
full or bare-metal.
1.  Add target config option application-profile for application to
    select which application profile to use. Applications are responsible
    for make this target config option consitent with link selection of
    mbed-os/mbed-baremetal.
2.  Add cmake interface library mbed-application-profile-flags. It is to
    substitute for mbed-core-flags/mbed-rtos-flags. Library camke targets
    should change to link this one to build upon correct application profile
    selection.

Author: ccli8

CMakeLists.txt

@@ -121,6 +121,43 @@ add_library(mbed-rtos-sources INTERFACE) # Collects source files that are in mbe
 add_library(mbed-core-flags INTERFACE) # Collects flags common to mbed-baremetal and mbed-os
 add_library(mbed-core-sources INTERFACE) # Collects source files common to mbed-baremetal and mbed-os
 
+# Add mbed-application-profile-flags which is to substitue for mbed-core-flags/
+# mbed-rtos-flags whose linking need to depend on selected application profile
+add_library(mbed-application-profile-flags INTERFACE)
+target_link_libraries(mbed-application-profile-flags INTERFACE mbed-core-flags)
+
+if("MBED_CONF_TARGET_APPLICATION_PROFILE=full" IN_LIST MBED_CONFIG_DEFINITIONS)
+    set(application_profile_config_full TRUE)
+endif()
+if("MBED_CONF_TARGET_APPLICATION_PROFILE=bare-metal" IN_LIST MBED_CONFIG_DEFINITIONS)
+    set(application_profile_config_baremetal TRUE)
+endif()
+if(NOT application_profile_config_full AND NOT application_profile_config_baremetal)
+    set(application_profile_config_auto TRUE)
+endif()
+
+# mbed-application-profile-flags links mbed-os-flags or not
+if((application_profile_config_auto OR application_profile_config_full) AND
+    (NOT MBED_ENABLE_OS_INTERNAL_TESTS OR NOT MBED_BUILD_GREENTEA_TESTS OR NOT MBED_GREENTEA_TEST_BAREMETAL))
+    target_link_libraries(mbed-application-profile-flags INTERFACE mbed-rtos-flags)
+endif()
+
+if(MBED_ENABLE_OS_INTERNAL_TESTS AND MBED_BUILD_GREENTEA_TESTS)
+    if(application_profile_config_full AND MBED_GREENTEA_TEST_BAREMETAL)
+        message(FATAL_ERROR
+            " Miamatched application profile config:\n"
+            " target.application-profile: full\n"
+            " MBED_GREENTEA_TEST_BAREMETAL: TRUE"
+        )
+    elseif(application_profile_config_baremetal AND NOT MBED_GREENTEA_TEST_BAREMETAL)
+        message(FATAL_ERROR
+            " Miamatched application profile config:\n"
+            " target.application-profile: bare-metal\n"
+            " MBED_GREENTEA_TEST_BAREMETAL: FALSE"
+        )
+    endif()
+endif()
+
 # Validate selected C library type
 # The C library type selected has to match the library that the target can support
 if(NOT MBED_IS_NATIVE_BUILD)

targets/targets.json5

@@ -100,6 +100,10 @@
             "semihosting-enabled": {
                 "help": "Enable ARM Semihosting protocol.  This uses a magic breakpoint instruction to enable the MCU to print data to and access files on a host machine.  However, it can interfere with debuggers that are not semihost aware.",
                 "value": false
+            },
+            "application-profile": {
+                "help": "Select application profile. Options: auto, full, bare-metal.",
+                "value": "auto"
             }
         }
     },