[cmake] add pedantic-errors flag (#4808)

CMakeLists.txt

@@ -51,7 +51,7 @@ if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID MATCHES "(Apple)?[Cc]lang")
 
     set(OT_CFLAGS
         $<$<COMPILE_LANGUAGE:C>:${OT_CFLAGS} -Wall -Wextra -Wshadow -pedantic-errors>
-        $<$<COMPILE_LANGUAGE:CXX>:${OT_CFLAGS} -Wall -Wextra -Wshadow -Wno-c++14-compat -fno-exceptions>
+        $<$<COMPILE_LANGUAGE:CXX>:${OT_CFLAGS} -Wall -Wextra -Wshadow -Wno-c++14-compat -fno-exceptions -pedantic-errors>
     )
 endif()
 

src/cli/CMakeLists.txt

@@ -33,7 +33,7 @@ set_target_properties(
     openthread-cli-ftd openthread-cli-mtd
     PROPERTIES
         C_STANDARD 99
-        CXX_STANDARD 98
+        CXX_STANDARD 11
 )
 
 target_compile_definitions(openthread-cli-ftd PRIVATE

src/core/CMakeLists.txt

@@ -34,7 +34,7 @@ set_target_properties(
     openthread-ftd openthread-mtd openthread-radio
     PROPERTIES
         C_STANDARD 99
-        CXX_STANDARD 98
+        CXX_STANDARD 11
 )
 
 target_compile_definitions(openthread-ftd PRIVATE

src/lib/hdlc/CMakeLists.txt

@@ -30,6 +30,13 @@ add_library(openthread-hdlc
     hdlc.cpp
 )
 
+set_target_properties(
+    openthread-hdlc
+    PROPERTIES
+        C_STANDARD 99
+        CXX_STANDARD 11
+)
+
 target_include_directories(openthread-hdlc
     PUBLIC
         ${OT_PUBLIC_INCLUDES}

src/lib/spinel/CMakeLists.txt

@@ -29,6 +29,13 @@
 add_library(openthread-spinel-ncp)
 add_library(openthread-spinel-rcp)
 
+set_target_properties(
+    openthread-spinel-ncp openthread-spinel-rcp
+    PROPERTIES
+        C_STANDARD 99
+        CXX_STANDARD 11
+)
+
 target_compile_definitions(openthread-spinel-ncp PRIVATE
     ${OT_PRIVATE_DEFINES}
     OPENTHREAD_FTD=1

src/ncp/CMakeLists.txt

@@ -32,10 +32,10 @@ add_library(openthread-rcp)
 
 # We depend on C++11 to validate that NCP handlers are sorted.
 set_target_properties(
-    openthread-ncp-mtd openthread-rcp
+    openthread-ncp-ftd openthread-ncp-mtd openthread-rcp
     PROPERTIES
         C_STANDARD 99
-        CXX_STANDARD 98
+        CXX_STANDARD 11
 )
 
 target_compile_definitions(openthread-ncp-ftd PRIVATE