From 132ae52428cce955ab3a31dcf1914b69dc82910d Mon Sep 17 00:00:00 2001
From: chrchr-github <78114321+chrchr-github@users.noreply.github.com>
Date: Tue, 7 Feb 2023 21:58:44 +0100
Subject: [PATCH] Don't show checkLibraryFunction warning for types with
 unusedvar configuration (#4765)

---
 lib/checkfunctions.cpp | 3 +++
 test/testfunctions.cpp | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/lib/checkfunctions.cpp b/lib/checkfunctions.cpp
index 37ebca53e..a521f14b4 100644
--- a/lib/checkfunctions.cpp
+++ b/lib/checkfunctions.cpp
@@ -637,6 +637,9 @@ void CheckFunctions::checkLibraryMatchFunctions()
         if (mSettings->library.podtype(tok->expressionString()))
             continue;
 
+        if (mSettings->library.getTypeCheck("unusedvar", functionName) != Library::TypeCheck::def)
+            continue;
+
         const Token* start = tok;
         while (Token::Match(start->tokAt(-2), "%name% ::"))
             start = start->tokAt(-2);
diff --git a/test/testfunctions.cpp b/test/testfunctions.cpp
index ffacc665a..a79715dfd 100644
--- a/test/testfunctions.cpp
+++ b/test/testfunctions.cpp
@@ -1957,6 +1957,11 @@ private:
               "}\n");
         ASSERT_EQUALS("", errout.str());
 
+        check("auto f() {\n"
+              "    return std::runtime_error(\"abc\");\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
+
         settings = settings_old;
     }