fix #13553

Author: ludviggunne

Diff for: lib/symboldatabase.cpp

@@ -2639,6 +2639,9 @@ const Token *Function::setFlags(const Token *tok1, const Scope *scope)
     if (tok1->isInline())
         isInlineKeyword(true);
 
+    if (tok1->isExternC())
+        isExtern(true);
+
     // look for end of previous statement
     while (tok1->previous() && !Token::Match(tok1->previous(), ";|}|{|public:|protected:|private:")) {
         tok1 = tok1->previous();
@@ -2647,7 +2650,7 @@ const Token *Function::setFlags(const Token *tok1, const Scope *scope)
             isInlineKeyword(true);
 
         // extern function
-        if (tok1->isExternC() || tok1->str() == "extern") {
+        if (tok1->str() == "extern") {
             isExtern(true);
         }