================
@@ -0,0 +1,176 @@
+// RUN: %clang_cc1 -fsyntax-only -verify=expected,beforeCxx2b
-Wmissing-format-attribute %s
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++2b -Wmissing-format-attribute
%s
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++23 -Wmissing-format-attribute
%s
+// RUN: not %clang_cc1 -fsyntax-only -Wmissing-format-attribute
-fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s
+
+typedef __SIZE_TYPE__ size_t;
+typedef __builtin_va_list va_list;
+
+namespace std
+{
+ template<class Elem> struct basic_string_view {};
+ template<class Elem> struct basic_string {
+ const Elem *c_str() const noexcept;
+ basic_string(const basic_string_view<Elem> SW);
+ };
+
+ using string = basic_string<char>;
+ using wstring = basic_string<wchar_t>;
+ using string_view = basic_string_view<char>;
+ using wstring_view = basic_string_view<wchar_t>;
+}
+
+__attribute__((__format__(__printf__, 1, 2)))
+int printf(const char *, ...); // #printf
+
+__attribute__((__format__(__scanf__, 1, 2)))
+int scanf(const char *, ...); // #scanf
+
+__attribute__((__format__(__printf__, 1, 0)))
+int vprintf(const char *, va_list); // #vprintf
+
+__attribute__((__format__(__scanf__, 1, 0)))
+int vscanf(const char *, va_list); // #vscanf
+
+__attribute__((__format__(__printf__, 2, 0)))
+int vsprintf(char *, const char *, va_list); // #vsprintf
+
+__attribute__((__format__(__printf__, 3, 0)))
+int vsnprintf(char *, size_t, const char *, va_list); // #vsnprintf
+
+int vwprintf(const wchar_t *, va_list); // #vwprintf
+
+void f1(const std::string &str, ... /* args */) // #f1
+{
+ va_list args;
+ vscanf(str.c_str(), args); // expected-no-warning@#f1
+}
+
+__attribute__((format(printf, 1, 2))) // expected-error {{format argument not
a string type}}
+void f2(const std::string &str, ... /* args */); // #f2
+
+void f3(std::string_view str, ... /* args */) // #f3
+{
+ va_list args;
+ vscanf(std::string(str).c_str(), args); // expected-no-warning@#f3
+}
+
+__attribute__((format(printf, 1, 2))) // expected-error {{format argument not
a string type}}
+void f4(std::string_view str, ... /* args */); // #f4
+
+void f5(const std::wstring &str, ... /* args */) // #f5
+{
+ va_list args;
+ vwprintf(str.c_str(), args); // expected-no-warning@#f5
+}
+
+__attribute__((format(printf, 1, 2))) // expected-error {{format argument not
a string type}}
+void f6(const std::wstring &str, ... /* args */); // #f6
+
+void f7(std::wstring_view str, ... /* args */) // #f7
+{
+ va_list args;
+ vwprintf(std::wstring(str).c_str(), args); // expected-no-warning@#f7
+}
+
+__attribute__((format(printf, 1, 2))) // expected-error {{format argument not
a string type}}
+void f8(std::wstring_view str, ... /* args */); // #f8
+
+struct S1
+{
+ void fn1(const char *out, ... /* args */) // #S1_fn1
+ {
+ va_list args;
+ vscanf(out, args); // expected-warning@#S1_fn1 {{diagnostic behavior
may be improved by adding the 'scanf' format attribute to the declaration of
'fn1'}}
+ // CHECK:
fix-it:"{{.*}}":{[[@LINE-4]]:10-[[@LINE-4]]:10}:"__attribute__((format(scanf,
2, 3)))"
+ }
+
+ __attribute__((format(scanf, 2, 0)))
+ void fn2(const char *out, va_list args); // #S1_fn2
+
+ void fn3(const char *out, ... /* args */);
+
+ void fn4(this S1& expliciteThis, const char *out, va_list args) // #S1_fn4
+ {
+ expliciteThis.fn2(out, args); // beforeCxx2b-error@#S1_fn4 {{explicit
object parameters are incompatible with C++ standards before C++2b}}
----------------
budimirarandjelovichtec wrote:
Guarded with ```cxx_explicit_this_parameter```.
https://github.com/llvm/llvm-project/pull/105479
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