[cmake] fix OT_THREAD_VERSION comparison in CMake (#9158)

This commit fixes the check for CMake `OT_THREAD_VERSION` against
different version strings ("1.1", 1.2", "1.3", and "1.3.1"). The
previous check used `EQUAL`, which would do a numerical match and
would treat `1.3` and `1.3.1` as equal. This commit changes the check
to use `STREQUAL`, which does a string match and will correctly
distinguish between `1.3` and `1.3.1`.

This commit also adds new `message(STATUS)` commands to output the
selected Thread version. This makes it easier to see which version of
Thread is being built.

CMakeLists.txt

@@ -108,14 +108,18 @@ message(STATUS "Package Version: ${OT_PACKAGE_VERSION}")
 
 set(OT_THREAD_VERSION "1.3" CACHE STRING "Thread version chosen by the user at configure time")
 set_property(CACHE OT_THREAD_VERSION PROPERTY STRINGS "1.1" "1.2" "1.3" "1.3.1")
-if(${OT_THREAD_VERSION} EQUAL "1.1")
+if(${OT_THREAD_VERSION} STREQUAL "1.1")
     target_compile_definitions(ot-config INTERFACE "OPENTHREAD_CONFIG_THREAD_VERSION=OT_THREAD_VERSION_1_1")
-elseif(${OT_THREAD_VERSION} EQUAL "1.2")
+    message(STATUS "Thread Version: 1.1 (OPENTHREAD_CONFIG_THREAD_VERSION=OT_THREAD_VERSION_1_1)")
+elseif(${OT_THREAD_VERSION} STREQUAL "1.2")
     target_compile_definitions(ot-config INTERFACE "OPENTHREAD_CONFIG_THREAD_VERSION=OT_THREAD_VERSION_1_2")
-elseif(${OT_THREAD_VERSION} EQUAL "1.3")
+    message(STATUS "Thread Version: 1.2 (OPENTHREAD_CONFIG_THREAD_VERSION=OT_THREAD_VERSION_1_2)")
+elseif(${OT_THREAD_VERSION} STREQUAL "1.3")
     target_compile_definitions(ot-config INTERFACE "OPENTHREAD_CONFIG_THREAD_VERSION=OT_THREAD_VERSION_1_3")
-elseif(${OT_THREAD_VERSION} EQUAL "1.3.1")
+    message(STATUS "Thread Version: 1.3 (OPENTHREAD_CONFIG_THREAD_VERSION=OT_THREAD_VERSION_1_3)")
+elseif(${OT_THREAD_VERSION} STREQUAL "1.3.1")
     target_compile_definitions(ot-config INTERFACE "OPENTHREAD_CONFIG_THREAD_VERSION=OT_THREAD_VERSION_1_3_1")
+    message(STATUS "Thread Version: 1.3.1 (OPENTHREAD_CONFIG_THREAD_VERSION=OT_THREAD_VERSION_1_3_1)")
 else()
     message(FATAL_ERROR "Thread version unknown: ${OT_THREAD_VERSION}")
 endif()

etc/cmake/options.cmake

@@ -42,6 +42,7 @@ message(STATUS OT_APP_RCP=${OT_APP_RCP})
 message(STATUS OT_FTD=${OT_FTD})
 message(STATUS OT_MTD=${OT_MTD})
 message(STATUS OT_RCP=${OT_RCP})
+message(STATUS OT_THREAD_VERSION=${OT_THREAD_VERSION})
 
 set(OT_CONFIG_VALUES
     ""