https://github.com/ccrownhill updated
https://github.com/llvm/llvm-project/pull/98016
>From 5dd2bb12dee26ba93d927ad1cd99fa610f9ace97 Mon Sep 17 00:00:00 2001
From: ccrownhill <ckronbich...@proton.me>
Date: Mon, 8 Jul 2024 11:42:37 +0100
Subject: [PATCH 1/3] fix bug that undefined internal is a warning only for
-pedantic-errors
---
clang/include/clang/Basic/DiagnosticSemaKinds.td | 2 +-
clang/test/Sema/undefined_internal.c | 11 +++++++++++
2 files changed, 12 insertions(+), 1 deletion(-)
create mode 100644 clang/test/Sema/undefined_internal.c
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td
b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 44fd51ec9abc9..ae3dbedd01693 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -6013,7 +6013,7 @@ def note_deleted_assign_field : Note<
"because field %2 is of %select{reference|const-qualified}4 type %3">;
// These should be errors.
-def warn_undefined_internal : Warning<
+def warn_undefined_internal : ExtWarn<
"%select{function|variable}0 %q1 has internal linkage but is not defined">,
InGroup<DiagGroup<"undefined-internal">>;
def err_undefined_internal_type : Error<
diff --git a/clang/test/Sema/undefined_internal.c
b/clang/test/Sema/undefined_internal.c
new file mode 100644
index 0000000000000..1b6c3a4b76e05
--- /dev/null
+++ b/clang/test/Sema/undefined_internal.c
@@ -0,0 +1,11 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s -pedantic-errors
+
+static void f(void); // expected-error {{function 'f' has internal linkage but
is not defined}}
+
+int main(void)
+{
+ f;
+ // expected-note@-1 {{used here}}
+ // expected-warning@-2 {{expression result unused}}
+}
+
>From 9e679ac9c2c669b595d361516b7e499e0b0457ba Mon Sep 17 00:00:00 2001
From: ccrownhill <ckronbich...@proton.me>
Date: Wed, 10 Jul 2024 12:06:28 +0100
Subject: [PATCH 2/3] add to change of undefined_internal to error for
-pedantic-errors to release notes
---
clang/docs/ReleaseNotes.rst | 3 +++
1 file changed, 3 insertions(+)
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 838cb69f647ee..a4146aeee25de 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -554,6 +554,9 @@ Attribute Changes in Clang
Improvements to Clang's diagnostics
-----------------------------------
+- Clang now emits an error instead of a warning for `undefined_internal`
+ when compiling with `-pedantic-errors` to conform to the C standard
+
- Clang now applies syntax highlighting to the code snippets it
prints.
>From b553d87a675cac5d60df2b1fdc586d6b7af6b687 Mon Sep 17 00:00:00 2001
From: ccrownhill <ckronbich...@proton.me>
Date: Wed, 10 Jul 2024 19:04:17 +0200
Subject: [PATCH 3/3] add more tests for undefined internals
---
...undefined_internal.c => undefined-internal-basic.c} | 0
clang/test/Sema/undefined-internal-generic-selection.c | 10 ++++++++++
clang/test/Sema/undefined-internal-sizeof.c | 10 ++++++++++
clang/test/Sema/undefined-internal-typeof.c | 10 ++++++++++
4 files changed, 30 insertions(+)
rename clang/test/Sema/{undefined_internal.c => undefined-internal-basic.c}
(100%)
create mode 100644 clang/test/Sema/undefined-internal-generic-selection.c
create mode 100644 clang/test/Sema/undefined-internal-sizeof.c
create mode 100644 clang/test/Sema/undefined-internal-typeof.c
diff --git a/clang/test/Sema/undefined_internal.c
b/clang/test/Sema/undefined-internal-basic.c
similarity index 100%
rename from clang/test/Sema/undefined_internal.c
rename to clang/test/Sema/undefined-internal-basic.c
diff --git a/clang/test/Sema/undefined-internal-generic-selection.c
b/clang/test/Sema/undefined-internal-generic-selection.c
new file mode 100644
index 0000000000000..0a2b4b61e68e7
--- /dev/null
+++ b/clang/test/Sema/undefined-internal-generic-selection.c
@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s -pedantic-errors
+
+// expected-no-diagnostics
+
+static int f(void);
+
+int main(void)
+{
+ int x = _Generic(f(), int: 10, short: 20);
+}
diff --git a/clang/test/Sema/undefined-internal-sizeof.c
b/clang/test/Sema/undefined-internal-sizeof.c
new file mode 100644
index 0000000000000..f609473b1341c
--- /dev/null
+++ b/clang/test/Sema/undefined-internal-sizeof.c
@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s -pedantic-errors
+
+// expected-no-diagnostics
+
+static int f(void);
+
+int main(void)
+{
+ int x = sizeof f();
+}
diff --git a/clang/test/Sema/undefined-internal-typeof.c
b/clang/test/Sema/undefined-internal-typeof.c
new file mode 100644
index 0000000000000..51c682ef7e942
--- /dev/null
+++ b/clang/test/Sema/undefined-internal-typeof.c
@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c23 -pedantic-errors
+
+// expected-no-diagnostics
+
+static int f(void);
+
+int main(void)
+{
+ typeof(f()) x;
+}
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