[build] fix errors and warnings when building on IAR and Keil (#2868)

src/core/common/string.cpp

@@ -74,4 +74,4 @@ otError StringBase::Write(char *aBuffer, uint16_t aSize, uint16_t &aLength, cons
 
 #endif // OT_STRING_WINDOWS_WORKAROUND
 
-} // namespace ot
+} // namespace ot

src/core/thread/lowpan.cpp

@@ -1226,13 +1226,13 @@ otError FragmentHeader::Init(const Message &aMessage, uint16_t aOffset)
     otError  error = OT_ERROR_NONE;
     uint16_t bytesRead;
 
-    bytesRead = aMessage.Read(aOffset, sizeof(mDispatchSize), &mDispatchSize);
+    bytesRead = aMessage.Read(aOffset, sizeof(mDispatchSize), reinterpret_cast<void *>(&mDispatchSize));
     VerifyOrExit(bytesRead == sizeof(mDispatchSize), error = OT_ERROR_PARSE);
     aOffset += bytesRead;
 
     VerifyOrExit(IsFragmentHeader(), error = OT_ERROR_PARSE);
 
-    bytesRead = aMessage.Read(aOffset, sizeof(mTag), &mTag);
+    bytesRead = aMessage.Read(aOffset, sizeof(mTag), reinterpret_cast<void *>(&mTag));
     VerifyOrExit(bytesRead == sizeof(mTag), error = OT_ERROR_PARSE);
     aOffset += bytesRead;
 

third_party/NordicSemiconductor/libraries/crypto/nrf52840-mbedtls-config.h

@@ -34,4 +34,5 @@
 
 #if defined(__ICCARM__)
     _Pragma("diag_suppress=Pe549")
+    _Pragma("diag_suppress=Pa082")
 #endif