[clang] Make sure all C++ DR tests are running with -pedantic-errors (#94203)

In #94167 I found out that `cwg28xx.cpp` has been running without
`-pedantic-errors` and fixed that. This patch fixes that for the rest of
the test suite. Only one test was affected with a trivial fix (warning
was escalated to an error).

I'm intentionally leaving out test for CWG2390, because it requires
major surgery. It's addressed in #94206.

Author: Endilll

clang/test/CXX/drs/cwg24xx.cpp

@@ -1,10 +1,10 @@
-// RUN: %clang_cc1 -std=c++98 %s -verify=expected
-// RUN: %clang_cc1 -std=c++11 %s -verify=expected
-// RUN: %clang_cc1 -std=c++14 %s -verify=expected
-// RUN: %clang_cc1 -std=c++17 %s -verify=expected,since-cxx17
-// RUN: %clang_cc1 -std=c++20 %s -verify=expected,since-cxx17
-// RUN: %clang_cc1 -std=c++23 %s -verify=expected,since-cxx17
-// RUN: %clang_cc1 -std=c++2c %s -verify=expected,since-cxx17
+// RUN: %clang_cc1 -std=c++98 -pedantic-errors %s -verify=expected
+// RUN: %clang_cc1 -std=c++11 -pedantic-errors %s -verify=expected
+// RUN: %clang_cc1 -std=c++14 -pedantic-errors %s -verify=expected
+// RUN: %clang_cc1 -std=c++17 -pedantic-errors %s -verify=expected,since-cxx17
+// RUN: %clang_cc1 -std=c++20 -pedantic-errors %s -verify=expected,since-cxx17
+// RUN: %clang_cc1 -std=c++23 -pedantic-errors %s -verify=expected,since-cxx17
+// RUN: %clang_cc1 -std=c++2c -pedantic-errors %s -verify=expected,since-cxx17
 
 #if __cplusplus <= 201402L
 // expected-no-diagnostics

clang/test/CXX/drs/cwg2630.cpp

@@ -1,10 +1,10 @@
 // RUN: split-file --leading-lines %s %t
-// RUN: %clang_cc1 -std=c++20 -verify -emit-module-interface %t/module.cppm -o %t/module.pcm
-// RUN: %clang_cc1 -std=c++20 -verify -fmodule-file=A=%t/module.pcm %t/main.cpp
-// RUN: %clang_cc1 -std=c++23 -verify -emit-module-interface %t/module.cppm -o %t/module.pcm
-// RUN: %clang_cc1 -std=c++23 -verify -fmodule-file=A=%t/module.pcm %t/main.cpp
-// RUN: %clang_cc1 -std=c++2c -verify -emit-module-interface %t/module.cppm -o %t/module.pcm
-// RUN: %clang_cc1 -std=c++2c -verify -fmodule-file=A=%t/module.pcm %t/main.cpp
+// RUN: %clang_cc1 -std=c++20 -pedantic-errors -verify -emit-module-interface %t/module.cppm -o %t/module.pcm
+// RUN: %clang_cc1 -std=c++20 -pedantic-errors -verify -fmodule-file=A=%t/module.pcm %t/main.cpp
+// RUN: %clang_cc1 -std=c++23 -pedantic-errors -verify -emit-module-interface %t/module.cppm -o %t/module.pcm
+// RUN: %clang_cc1 -std=c++23 -pedantic-errors -verify -fmodule-file=A=%t/module.pcm %t/main.cpp
+// RUN: %clang_cc1 -std=c++2c -pedantic-errors -verify -emit-module-interface %t/module.cppm -o %t/module.pcm
+// RUN: %clang_cc1 -std=c++2c -pedantic-errors -verify -fmodule-file=A=%t/module.pcm %t/main.cpp
 
 //--- module.cppm
 // expected-no-diagnostics

clang/test/CXX/drs/cwg26xx.cpp

@@ -1,10 +1,10 @@
-// RUN: %clang_cc1 -std=c++98 -triple x86_64-unknown-unknown %s -verify=expected
-// RUN: %clang_cc1 -std=c++11 -triple x86_64-unknown-unknown %s -verify=expected,since-cxx11,cxx11
-// RUN: %clang_cc1 -std=c++14 -triple x86_64-unknown-unknown %s -verify=expected,since-cxx11
-// RUN: %clang_cc1 -std=c++17 -triple x86_64-unknown-unknown %s -verify=expected,since-cxx11
-// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-unknown %s -verify=expected,since-cxx11,since-cxx20
-// RUN: %clang_cc1 -std=c++23 -triple x86_64-unknown-unknown %s -verify=expected,since-cxx11,since-cxx20,since-cxx23
-// RUN: %clang_cc1 -std=c++2c -triple x86_64-unknown-unknown %s -verify=expected,since-cxx11,since-cxx20,since-cxx23
+// RUN: %clang_cc1 -std=c++98 -triple x86_64-unknown-unknown -pedantic-errors %s -verify=expected
+// RUN: %clang_cc1 -std=c++11 -triple x86_64-unknown-unknown -pedantic-errors %s -verify=expected,since-cxx11,cxx11
+// RUN: %clang_cc1 -std=c++14 -triple x86_64-unknown-unknown -pedantic-errors %s -verify=expected,since-cxx11
+// RUN: %clang_cc1 -std=c++17 -triple x86_64-unknown-unknown -pedantic-errors %s -verify=expected,since-cxx11
+// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-unknown -pedantic-errors %s -verify=expected,since-cxx11,since-cxx20
+// RUN: %clang_cc1 -std=c++23 -triple x86_64-unknown-unknown -pedantic-errors %s -verify=expected,since-cxx11,since-cxx20,since-cxx23
+// RUN: %clang_cc1 -std=c++2c -triple x86_64-unknown-unknown -pedantic-errors %s -verify=expected,since-cxx11,since-cxx20,since-cxx23
 
 
 namespace cwg2621 { // cwg2621: 16
@@ -129,7 +129,7 @@ int y = cwg2640_a\N{LOTUS});
 namespace cwg2644 { // cwg2644: 8
 #if __cplusplus >= 201103L
 auto z = [a = 42](int a) {
-// cxx11-warning@-1 {{initialized lambda captures are a C++14 extension}}
+// cxx11-error@-1 {{initialized lambda captures are a C++14 extension}}
 // since-cxx11-error@-2 {{a lambda parameter cannot shadow an explicitly captured entity}}
 //   since-cxx11-note@-3 {{variable 'a' is explicitly captured here}}
      return 1;

clang/test/CXX/drs/cwg27xx.cpp

@@ -1,10 +1,10 @@
-// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++98 -verify=expected %s
-// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++11 -verify=expected %s
-// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++14 -verify=expected %s
-// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++17 -verify=expected %s
-// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++20 -verify=expected %s
-// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++23 -verify=expected,since-cxx23 %s
-// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++2c -verify=expected,since-cxx23,since-cxx26 %s
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++98 -pedantic-errors -verify=expected %s
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++11 -pedantic-errors -verify=expected %s
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++14 -pedantic-errors -verify=expected %s
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++17 -pedantic-errors -verify=expected %s
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++20 -pedantic-errors -verify=expected %s
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++23 -pedantic-errors -verify=expected,since-cxx23 %s
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++2c -pedantic-errors -verify=expected,since-cxx23,since-cxx26 %s
 
 namespace cwg2718 { // cwg2718: 2.7
 struct B {};